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DLPA3005
DLPS071 – OCTOBER 2015
DLPA3005 PMIC and High-Current LED Driver IC
1 Features
3 Description
•
•
•
•
•
•
•
The DLPA3005 is a highly-integrated power
management IC optimized for DLP® Pico™ Projector
systems. The DLPA3005 supports LED projectors up
to 16 A per LED, enabled by an integrated high
efficiency buck controller. Additionally, the drivers
control the RGB switches, supporting the sequencing
of R, G, and B LEDs. The DLPA3005 contains five
buck converters, two of which are dedicated for
DLPC low voltage supplies. Another dedicated
regulating supply generates the three timing-critical
DC supplies for the DMD: VBIAS, VRST, and VOFS.
1
•
•
•
•
High-Efficiency, High-Current RGB LED Driver
Drivers for External Buck FETs up to 16 A
Drivers for External RGB Switches
10-Bit Programmable Current per Channel
Inputs for Selecting Color-Sequential RGB LEDs
Generation of DMD High Voltage Supplies
Two High Efficiency Buck Converters to Generate
the DLPC343x and DMD Supply
Three High Efficiency, 8-Bit Programmable Buck
Converters for FAN Driver Application or General
Power Supply. General Purpose Buck2 (PWR6
currently supported, others may be available in
the future)
Two LDOs Supplying Auxiliary Voltages
Analog MUX for Measuring internal and external
nodes such as a thermistor and reference levels
Monitoring/Protections: Thermal Shutdown, Hot
Die, Low-Battery, and Undervoltage Lockout
(UVLO)
The DLPA3005 contains several auxiliary blocks
which can be used in a flexible way. This enables a
tailor-made Pico Projector system. Three 8-bit
programmable buck converters can be used, for
instance, to drive rgb projector FANs or to make
auxiliary supply lines. General Purpose Buck2
(PWR6) currently supported, others may be available
in the future. Two LDOs can be used for a lowercurrent supply, up to 200 mA. These LDOs are predefined to 2.5 V and 3.3 V.
Through the SPI, all blocks of the DLPA3005 can be
addressed. Features included are the generation of
the system reset, power sequencing, input signals for
sequentially selecting the active LED, IC selfprotections, and an analog MUX for routing analog
information to an external ADC.
2 Applications
Portable DLP® Pico™ Projectors
Device Information(1)
PART NUMBER
DLPA3005
PACKAGE
HTQFP (100)
BODY SIZE (NOM)
14.00 mm × 14.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
System Block Diagram
Projector Module
+ BAT -
SYSPWR
CHARGER
DC
SUPPLIES
ILLUMINATION
FLASH
FAN(S)
HDMI
RECEIVER
VGA
FRONTEND
CHIP
SUPPLIES
and
MONITORING
DLPC3439
eDRAM
3x BUCK
CONVERTER
(GEN.PURP)
DIGITAL
CONTROL
FLASH,
SDRAM
RESET_Z
KEYPAD
- OSD
- Autolock
- Scaler
- Deinterlacer
- KS Corr
- uController
DLPC3439
eDRAM
FLASH
OPTICS
DLPA3005
PROJ_ON
SD CARD
READER,
VIDEO
DECODER,
etc
External
Power
FETs
SENSORS
MEASUREMENT
SYSTEM
DMD HIGH
VOLTAGE
GENERATION
1080P
Processor
TRP-DMD
DMD/DPP
BUCKS
Buck 1.1V
Buck 1.8V
AUX LDOs
LDO 2.5V
LDO 3.3V
CTRL / DATA
TI Device
Non-TI Device
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
DLPA3005
DLPS071 – OCTOBER 2015
www.ti.com
Table of Contents
1
2
3
4
5
6
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
6.1
6.2
6.3
6.4
6.5
6.6
7
9
9.1 Power-Up and Power-Down Timing........................ 59
Absolute Maximum Ratings ...................................... 7
ESD Ratings.............................................................. 8
Recommended Operating Conditions....................... 8
Thermal Information .................................................. 8
Electrical Characteristics........................................... 9
SPI Timing Parameters ........................................... 15
Overview .................................................................
Functional Block Description...................................
Feature Description.................................................
Device Functional Modes........................................
Programming...........................................................
Register Maps .........................................................
Power Supply Recommendations...................... 58
10 Layout................................................................... 62
10.1 Layout Guidelines ................................................. 62
10.2 Layout Example .................................................... 65
10.3 Thermal Considerations ........................................ 66
11 Device and Documentation Support ................. 68
11.1
11.2
11.3
11.4
11.5
11.6
Detailed Description ............................................ 16
7.1
7.2
7.3
7.4
7.5
7.6
8
8.1 Application Information............................................ 54
8.2 Typical Application .................................................. 54
8.3 System Example With DLPA3005 Internal Block
Diagram.................................................................... 57
1
1
1
2
3
7
16
16
17
37
40
44
Device Support......................................................
Related Links ........................................................
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
68
68
68
68
69
69
12 Mechanical, Packaging, and Orderable
Information ........................................................... 69
12.1 Package Option Addendum .................................. 70
Application and Implementation ........................ 54
4 Revision History
2
DATE
REVISION
NOTES
October 2015
*
Initial release.
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Copyright © 2015, Texas Instruments Incorporated
DLPA3005
www.ti.com
DLPS071 – OCTOBER 2015
5 Pin Configuration and Functions
PWR2_VIN
PWR2_SWITCH
PWR2_PGND
PWR2_FB
PWR5_FB
PWR5_PGND
PWR5_BOOST
PWR5_SWITCH
PWR5_VIN
PWR6_FB
PWR6_BOOST
PWR6_VIN
PWR6_SWITCH
PWR6_PGND
CH_SEL_1
CH_SEL_0
DGND
INT_Z
RESET_Z
PROJ_ON
ACMPR_LABB_SAMPLE
PWR7_PGND
PWR7_SWITCH
PWR7_VIN
PWR7_FB
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
PFD Package
100-Pin HTQFP
Top View
PWR2_BOOST
76
50
PWR7_BOOST
ACMPR_IN_1
77
49
SPI_MOSI
ACMPR_IN_2
78
48
SPI_SS_Z
ACMPR_IN_3
79
47
SPI_MISO
ACMPR_IN_LABB
80
46
SPI_CLK
ACMPR_OUT
81
45
SPI_VIN
ACMPR_REF
82
44
CW_SPEED_PWM_OUT
PWR_VIN
83
43
CLK_OUT
PWR_5P5V
84
42
THERMAL_PAD
VINA
85
41
ILLUM_B_COMP2
AGND
86
40
ILLUM_B_COMP1
PWR3_OUT
87
39
ILLUM_A_COMP2
PWR3_VIN
88
38
ILLUM_A_COMP1
PWR4_OUT
89
37
ILLUM_B_PGND
PWR4_VIN
90
36
ILLUM_B_SW
SUP_2P5V
91
35
ILLUM_B_FB
SUP_5P0V
92
34
ILLUM_B_VIN
PWR1_PGND
93
33
ILLUM_B_BOOST
PWR1_FB
94
32
ILLUM_A_PGND
PWR1_SWITCH
95
31
ILLUM_A_SW
PWR1_VIN
96
30
ILLUM_A_VIN
PWR1_BOOST
97
29
ILLUM_A_FB
DMD_VOFFSET
98
28
ILLUM_A_BOOST
DMD_VBIAS
99
27
ILLUM_LSIDE_DRIVE
100
26
ILLUM_HSIDE_DRIVE
22
23
24
25
RLIM_2
RLIM_2
CH3_SWITCH
CH3_SWITCH
19
CH1_GATE_CTRL
21
18
CH2_SWITCH
CH3_GATE_CTRL
17
CH2_SWITCH
20
16
RLIM_1
CH2_GATE_CTRL
15
10
CH1_SWITCH
RLIM_K_1
9
CH1_SWITCH
14
8
ILLUM_VIN
RLIM_BOT_K_1
7
ILLUM_5P5V
13
6
DRST_HS_IND
RLIM_K_2
5
DRST_VIN
12
4
DRST_PGND
RLIM_BOT_K_2
3
DRST_5P5V
11
2
RLIM_1
1
N/C
DRST_LS_IND
DMD_VRESET
DLPA3005
Pin Functions
PIN
NAME
NO.
I/O
DESCRIPTION
N/C
1
—
No connect
DRST_LS_IND
2
I/O
Connection for the DMD SMPS-inductor (low-side switch).
DRST_5P5V
3
O
Filter pin for LDO DMD. Power supply for internal DMD reset regulator, typical 5.5 V.
DRST_PGND
4
GND
DRST_VIN
5
POWER
DRST_HS_IND
6
I/O
Connection for the DMD SMPS-inductor (high-side switch).
ILLUM_5P5 V
7
O
Filter pin for LDO ILLUM. Power supply for internal ILLUM block, typical 5.5 V.
ILLUM_VIN
8
POWER
CH1_SWITCH
9
I
Low-side MOSFET switch for LED Cathode. Connect to RGB LED assembly.
CH1_SWITCH
10
I
Low-side MOSFET switch for LED Cathode. Connect to RGB LED assembly.
Copyright © 2015, Texas Instruments Incorporated
Power ground for DMD SMPS. Connect to ground plane.
Power supply input for LDO DMD. Connect to system power.
Supply input of LDO ILLUM. Connect to system power.
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Pin Functions (continued)
PIN
NAME
NO.
I/O
DESCRIPTION
RLIM_1
11
O
Connection to LED current sense resistor for CH1 and CH2.
RLIM_BOT_K_2
12
I
Kelvin sense connection to ground side of LED current sense resistor.
RLIM_K_2
13
I
Kelvin sense connection to top side of current sense resistor.
RLIM_BOT_K_1
14
I
Kelvin sense connection to ground side of LED current sense resistor.
RLIM_K_1
15
I
Kelvin sense connection to top side of current sense resistor.
RLIM_1
16
O
Connection to LED current sense resistor for CH1 and CH2.
CH2_SWITCH
17
I
Low-side MOSFET switch for LED cathode. Connect to RGB LED assembly.
CH2_SWITCH
18
I
Low-side MOSFET switch for LED cathode. Connect to RGB LED assembly.
CH1_GATE_CTRL
19
O
Gate control of CH1 external MOSFET switch for LED cathode.
CH2_GATE_CTRL
20
O
Gate control of CH2 external MOSFET switch for LED cathode.
CH3_GATE_CTRL
21
O
Gate control of CH3 external MOSFET switch for LED cathode.
RLIM_2
22
O
Connection to LED current sense resistor for CH3.
RLIM_2
23
O
Connection to LED current sense resistor for CH3.
CH3_SWITCH
24
I
Low-side MOSFET switch for LED Cathode. Connect to RGB LED assembly.
CH3_SWITCH
25
I
Low-side MOSFET switch for LED Cathode. Connect to RGB LED assembly.
ILLUM_HSIDE_DRIVE
26
O
Gate control for external high-side MOSFET for ILLUM Buck converter.
ILLUM_LSIDE_DRIVE
27
O
Gate control for external low-side MOSFET for ILLUM Buck converter.
ILLUM_A_BOOST
28
I
Supply voltage for high-side N-channel MOSFET gate driver. A 100 nF capacitor (typical)
must be connected between this pin and ILLUM_A_SW.
ILLUM_A_FB
29
I
Input to the buck converter loop controlling ILED.
ILLUM_A_VIN
30
POWER
ILLUM_A_SW
31
I/O
ILLUM_A_PGND
32
GND
ILLUM_B_BOOST
33
I
ILLUM_B_VIN
34
POWER
ILLUM_B_FB
35
I
ILLUM_B_SW
36
I/O
ILLUM_B_PGND
37
GND
ILLUM_A_COMP1
38
I/O
Connection node for feedback loop components
ILLUM_A_COMP2
39
I/O
Connection node for feedback loop components
ILLUM_B_COMP1
40
I/O
Connection node for feedback loop components
ILLUM_B_COMP2
41
I/O
Connection node for feedback loop components
THERMAL_PAD
42
GND
Thermal pad. Connect to clean system ground.
CLK_OUT
43
O
Color wheel clock output
CW_SPEED_PWM_OUT
44
O
Color wheel PWM output
SPI_VIN
45
I
Supply for SPI interface
SPI_CLK
46
I
SPI clock input
SPI_MISO
47
O
SPI data output
SPI_SS_Z
48
I
SPI chip select (active low)
SPI_MOSI
49
I
SPI data input
PWR7_BOOST
50
I
Charge-pump-supply input for the high-side FET gate drive circuit. Connect 100 nF
capacitor between PWR7_BOOST and PWR7_SWITCH pins.
PWR7_FB
51
I
Converter feedback input. Connect to converter output voltage.
PWR7_VIN
52
POWER
PWR7_SWITCH
53
I/O
PWR7_PGND
54
GND
4
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Power input to the ILLUM Driver A.
Switch node connection between high-side NFET and low-side NFET. Serves as common
connection for the flying high side FET driver.
Ground connection to the ILLUM Driver A.
Supply voltage for high-side N-channel MOSFET gate driver.
Power input to the ILLUM driver B.
Input to the buck converter loop controlling ILED.
Switch node connection between high-side NFET and low-side NFET.
Ground connection to the ILLUM driver B.
Power supply input for converter.
Switch node connection between high-side NFET and low-side NFET.
Ground pin. Power ground return for switching circuit.
Copyright © 2015, Texas Instruments Incorporated
DLPA3005
www.ti.com
DLPS071 – OCTOBER 2015
Pin Functions (continued)
PIN
I/O
DESCRIPTION
NAME
NO.
ACMPR_LABB_SAMPLE
55
I
Control signal to sample voltage at ACMPR_IN_LABB.
PROJ_ON
56
I
Input signal to enable/disable the IC and DLP projector.
RESET_Z
57
O
Reset output to the DLP system (active low). Pin is held low to reset DLP system.
INT_Z
58
O
Interrupt output signal (open drain, active low). Connect to pull-up resistor.
DGND
59
GND
CH_SEL_0
60
I
Control signal to enable either of CH1,2,3.
CH_SEL_1
61
I
Control signal to enable either of CH1,2,3.
PWR6_PGND
62
GND
PWR6_SWITCH
63
I/O
PWR6_VIN
64
POWER
PWR6_BOOST
65
I
Charge-pump-supply input for the high-side FET gate drive circuit. Connect 100 nF
capacitor between PWR6_BOOST and PWR6_SWITCH pins.
PWR6_FB
66
I
Converter feedback input. Connect to output voltage.
PWR5_VIN
67
POWER
PWR5_SWITCH
68
I/O
PWR5_BOOST
69
I
PWR5_PGND
70
GND
Ground pin. Power ground return for switching circuit.
PWR5_FB
71
I
Converter feedback input. Connect to output voltage.
PWR2_FB
72
I
Converter feedback input. Connect to output voltage.
PWR2_PGND
73
GND
Ground pin. Power ground return for switching circuit.
PWR2_SWITCH
74
I/O
PWR2_VIN
75
POWER
PWR2_BOOST
76
I
Charge-pump-supply input for the high-side FET gate drive circuit. Connect 100 nF
capacitor between PWR2_BOOST and PWR2_SWITCH pins.
ACMPR_IN_1
77
I
Input for analog sensor signal.
ACMPR_IN_2
78
I
Input for analog sensor signal.
ACMPR_IN_3
79
I
Input for analog sensor signal.
ACMPR_IN_LABB
80
I
Input for ambient light sensor, sampled input
ACMPR_OUT
81
O
Analog comparator out
ACMPR_REF
82
I
Reference voltage input for analog comparator
PWR_VIN
83
POWER
PWR_5P5V
84
O
VINA
85
POWER
AGND
86
GND
PWR3_OUT
87
O
PWR3_VIN
88
POWER
PWR4_OUT
89
O
PWR4_VIN
90
POWER
SUP_2P5V
91
O
Filter pin for LDO_V2V5. Internal supply voltage, typical 2.5 V.
SUP_5P0V
92
O
Filter pin for LDO_V5V. Internal supply voltage, typical 5 V.
PWR1_PGND
93
GND
Ground pin. Power ground return for switching circuit.
PWR1_FB
94
I
Converter feedback input. Connect to output voltage.
PWR1_SWITCH
95
I/O
PWR1_VIN
96
POWER
PWR1_BOOST
97
I
Copyright © 2015, Texas Instruments Incorporated
Digital ground. Connect to ground plane.
Ground pin. Power ground return for switching circuit.
Switch node connection between high-side NFET and low-side NFET.
Power supply input for converter.
Power supply input for converter.
Switch node connection between high-side NFET and low-side NFET.
Charge-pump-supply input for the high-side FET gate drive circuit. Connect 100nF
capacitor between PWR5_BOOST and PWR5_SWITCH pins.
Switch node connection between high-side NFET and low-side NFET.
Power supply input for converter.
Power supply input for LDO_Bucks. Connect to system power.
Filter pin for LDO_BUCKS. Internal analog supply for buck converters, typical 5.5 V.
Input voltage supply pin for Reference system.
Analog ground pin.
Filter pin for LDO_2 DMD/DLPC/AUX, typical 2.5 V.
Power supply input for LDO_2. Connect to system power.
Filter pin for LDO_1 DMD/DLPC/AUX, typical 3.3 V.
Power supply input for LDO_1. Connect to system power.
Switch node connection between high-side NFET and low-side NFET.
Power supply input for converter.
Charge-pump-supply input for the high-side FET gate drive circuit. Connect 100nF
capacitor between PWR1_BOOST and PWR1_SWITCH pins.
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Pin Functions (continued)
PIN
NAME
NO.
I/O
DESCRIPTION
DMD_VOFFSET
98
O
VOFS output rail. Connect to ceramic capacitor.
DMD_VBIAS
99
O
VBIAS output rail. Connect to ceramic capacitor.
DMD_VRESET
100
O
VRESET output rail. Connect to ceramic capacitor.
6
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DLPA3005
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DLPS071 – OCTOBER 2015
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature (unless otherwise noted)
(1)
MIN
MAX
ILLUM_A,B_BOOST
–0.3
28
ILLUM_A,B_BOOST (10 ns transient)
–0.3
30
ILLUM_A,B_BOOST vs ILLUM_A,B_SWITCH
–0.3
7
ILLUM_LSIDE_DRIVE
–0.3
7
–2
28
ILLUM_HSIDE_DRIVE
ILLUM_A_BOOST vs ILLUM_HSIDE_DRIVE
Voltage
Source current
Sink current
Tstg
(1)
-0.3
7
ILLUM_A,B_SW
–2
22
ILLUM_A,B_SW (10 ns transient)
–3
27
PWR_VIN, PWR1,2,3,4,5,6,7_VIN, VINA, ILLUM_VIN, ILLUM_A,B_VIN,
DRST_VIN
–0.3
22
PWR1,2,5,6,7_BOOST
–0.3
28
PWR1,2,5,6,7_BOOST (10 ns transient)
–0.3
30
PWR1,2,5,6,7_SWITCH
–2
22
PWR1,2,5,6,7_SWITCH (10 ns transient)
–3
27
PWR1,2,5,6,7_FB
–0.3
6.5
PWR1,2,5,6,7_BOOST vs PWR1,2,5,6,7_SWITCH
–0.3
6.5
CH1,2,3_SWITCH, DRST_LS_IND, ILLUM_A,B_FB
–0.3
20
ILLUM_A,B_COMP1,2, INT_Z, PROJ_ON
–0.3
7
DRST_HS_IND
–18
7
ACMPR_IN_1,2,3, ACMPR_REF, ACMPR_IN_LABB,
ACMPR_LABB_SAMPLE, ACMPR_OUT
–0.3
3.6
SPI_VIN, SPI_CLK, SPI_MOSI, SPI_SS_Z, SPI_MISO, CH_SEL_0,1,
RESET_Z
–0.3
3.6
RLIM_K_1,2, RLIM_1,2
–0.3
3.6
DGND, AGND, DRST_PGND, ILLUM_A,B_PGND, PWR1,2,5,6,7_PGND,
RLIM_BOT_K_1,2
–0.3
0.3
DRST_5P5V, ILLUM_5P5V, PWR_5P5, PWR3,4_OUT, SUP_5P0V
–0.3
7
CH1,2,3_GATE_CTRL
–0.3
7
CLK_OUT
–0.3
3.6
CW_SPEED_PWM
–0.3
7
SUP_2P5V
–0.3
3.6
DMD_VOFFSET
–0.3
12
DMD_VBIAS
–0.3
20
DMD_VRESET
–18
7
RESET_Z, ACMPR_OUT
1
SPI_DOUT
5.5
RESET_Z, ACMPR_OUT
1
SPI_DOUT, INT_Z
Storage temperature
5.5
–65
150
UNIT
V
mA
mA
ºC
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Copyright © 2015, Texas Instruments Incorporated
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6.2 ESD Ratings
VALUE
V(ESD) (1)
(1)
(2)
(3)
Electrostatic
discharge
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins (2)
±2000
Charged device model (CDM), per JEDEC specification JESD22-C101, all pins (3)
±500
UNIT
V
Electrostatic discharge (ESD) to measure device sensitivity and immunity to damage caused by assembly line electrostatic discharges in
to the device.
JEDEC document JEP155 states that 500 V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250 V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
MAX
6
20
CH1,2,3_SWITCH, ILLUM_A,B_FB,
–0.1
6.3
INT_Z, PROJ_ON
–0.1
6
PWR1,2,5,6,7_FB
–0.1
5
ACMPR_REF, CH_SEL_0,1, SPI_CLK, SPI_MOSI, SPI_SS_Z
–0.1
3.6
RLIM_BOT_K_1,2
–0.1
0.1
ACMPR_IN_1,2,3, LABB_IN_LABB
–0.1
1.5
1.7
3.6
RLIM_K_1,2
–0.1
0.25
ILLUM_A,B_COMP1,2
–0.1
5.7
Ambient temperature range
0
70
°C
Operating junction temperature
0
120
°C
PWR_VIN, PWR1,2,3,4,5,6,7_VIN, VINA, ILLUM_VIN,
ILLUM_A,B_VIN, DRST_VIN
Input voltage range
SPI_VIN
UNIT
V
6.4 Thermal Information
DLPA3005
THERMAL METRIC (1)
PFD (HTQFP)
UNIT
100 PINS
RθJA
Junction-to-ambient thermal resistance
(2)
(3)
RθJC(top)
Junction-to-case (top) thermal resistance
RθJB
Junction-to-board thermal resistance
ψJT
Junction-to-top characterization parameter
(4)
ψJB
Junction-to-board characterization parameter
RθJC(bot)
Junction-to-case (bottom) thermal resistance
(1)
(2)
(3)
(4)
(5)
8
(5)
7.0
°C/W
0.7
°C/W
N/A
°C/W
0.6
°C/W
3.4
°C/W
N/A
°C/W
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
The junction-to-ambient thermal resistance under natural convection is obtained in a simulation on a JEDEC-standard, high-K board, but
since the device is intended to be cooled with a heatsink from the top case of the package, the simulation includes a fan and heatsink
attached to the DLPA3005. The heatsink is a 22 mm × 22 mm × 12 mm aluminum pin fin heatsink with a 12 × 12 × 3 mm stud. Base
thickness is 2 mm and pin diameter is 1.5 mm with an array of 6 × 6 pins. The heatsink is attached to the DLPA3005 with 100 um thick
thermal grease with 3 W/m-K thermal conductivity. The fan is 20 × 20 × 8 mm with 1.6 cfm open volume flow rate and 0.22 in. water
pressure at stagnation.
The junction-to-case (top) thermal resistance is obtained by simulating a cold plate test on the package top. No specific JEDEC standard
test exists, but a close description can be found in the ANSI SEMI standard G30-88.
The junction-to-top characterization parameter, ψJT, estimates the junction temperature of a device in a real system and is extracted
from the simulation data for obtaining RθJA, using a procedure described in JESD51-2a (sections 6 and 7), but modified to include the
fan and heatsink described in note 2.
The junction-to-board characterization parameter, ψJB, estimates the junction temperature of a device in a real system and is extracted
from the simulation data for obtaining RθJA, using a procedure described in JESD51-2a (sections 6 and 7), but modified to include the
fan and heatsink described in note 2.
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6.5 Electrical Characteristics
Over operating free-air temperature range. VIN = 12 V, TA = 0 to +70°C, typical values are at TA = 25°C, Configuration
according to Typical Application (VIN =12 V, IOUT = 16 A, LED, external FETs) (unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
12
20
V
18.4
V
SUPPLIES
INPUT VOLTAGE
VIN
Input voltage range
VINA – pin
6 (1)
VLOW_BAT
Low battery warning
threshold
VINA falling (via 5 bit trim function, 0.5 V
steps)
3.9
Hysteresis
VINA rising
UVLO threshold
VINA falling (via 5 bit trim function, 0.5 V
steps)
Hysteresis
VINA rising
Startup voltage
DMD_VBIAS, DMD_VOFFSET,
DMD_VRESET loaded with 10 mA
Idle current
IDLE mode, all VIN pins combined
15
µA
ISTD
Standby current
STANDBY mode, analog, internal supplies
and LDOs enabled, DMD, ILLUMINATION
and BUCK CONVERTERS disabled.
3.7
mA
IQ_DMD
Quiescent current (DMD)
Quiescent current DMD block (in addtion to
ISTD) with DMD type TRP, VINA + DRST_VIN
0.49
mA
Quiescent current (ILLUM)
Quiescent current ILLUM block (in addtion to
ISTD), V_openloop= 3 V (0x18,
ILLUM_OLV_SEL), VINA + ILLUM_VIN +
ILLUM_A_VIN + ILLUM_B_VIN
21
mA
Quiescent current per BUCK converter (in
addtion to ISTD), Normal mode, VINA +
PWR_VIN + PWR1,2,5,6,7_VIN,
PWR1,2,5,6,7_VOUT = 1 V
4.3
Quiescent current per BUCK converter (in
addtion to ISTD), Normal mode, VINA +
PWR_VIN + PWR1,2,5,6,7_VIN,
PWR1,2,5,6,7_VOUT = 5 V
15
VUVLO
VSTARTUP
90
3.9
mV
18.4
90
V
mV
6
V
INPUT CURRENT
IIDLE
IQ_ILLUM
IQ_BUCK
IQ_TOTAL
Quiescent current
(per BUCK)
Quiescent current (Total)
mA
Quiescent current per BUCK converter (in
addtion to ISTD), Cycle-skipping mode, VINA +
PWR_VIN + PWR1,2,5,6,7_VIN = 1 V
0.41
Quiescent current per BUCK converter (in
addtion to ISTD), Cycle-skipping mode, VINA +
PWR_VIN + PWR1,2,5,6,7_VIN = 5 V
0.46
Typical Application: ACTIVE mode, all VIN
pins combined, DMD, ILLUMINATION and
PWR1,2 enabled, PWR3,4,5,6,7 disabled.
38
mA
5
V
2.5
V
INTERNAL SUPPLIES
VSUP_5P0V
Internal supply, analog
VSUP_2P5V
Internal supply, logic
DMD - LDO DMD
VDRST_VIN
VDRST_5P5V
(1)
6
12
20
5.5
V
V
VIN must be higher than the UVLO voltage setting, including after accounting for AC noise on VIN, for the DLPA3005 to fully operate.
While 6.0V is the min VIN voltage supported, TI recommends that the UVLO is never set below 6.21V. 6.21V gives margin above 6.0V
to protect against the case where someone suddenly removes VIN’s power supply which causes the VIN voltage to drop rapidly. Failure
to keep VIN above 6.0V before the mirrors are parked and VOFS, VRST, and VBIAS supplies are properly shut down can result in
permanent damage to the DMD. Since 6.21V is .21V above 6.0V, when UVLO trips there is time for the DLPA3005 and DLPC343x to
park the DMD mirrors and do a fast shut down of supplies VOFS, VRST, and VBIAS. For whatever UVLO setting is used, if VIN’s power
supply is suddenly removed enough bulk capacitance should be included on VIN inside the projector to keep VIN above 6.0V for at least
100us after UVLO trips.
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Electrical Characteristics (continued)
Over operating free-air temperature range. VIN = 12 V, TA = 0 to +70°C, typical values are at TA = 25°C, Configuration
according to Typical Application (VIN =12 V, IOUT = 16 A, LED, external FETs) (unless otherwise noted).
PARAMETER
PGOOD
Power good DRST_5P5V
OVP
Overvoltage protection
DRST_5P5V
Regulator dropout
TEST CONDITIONS
MIN
TYP
Rising
80%
Faling
60%
MAX
7.2
At 25 mA, VDRST_VIN= 5.5 V
V
56
Regulator current limit (2)
300
340
UNIT
mV
400
mA
DMD - REGULATOR
RDS(ON)
VFW
MOSFET ON-resistance
Forward voltage drop
Switch A (from DRST_5P5V to
DRST_HS_IND)
920
Switch B (from DRST_LS_IND to
DRST_PGND)
450
Switch C (from DRST_LS_IND to
DRST_VBIAS (3)), VDRST_LS_IND = 2 V, IF =
100 mA
1.21
Switch D (from DRST_LS_IND to
DRST_VOFFSET (3)), VDRST_LS_IND = 2 V,
IF = 100 mA
1.22
tDIS
Rail Discharge time
COUT= 1 µF
tPG
Power-good timeout
not tested in production
ILIMIT
Switch current limit
mΩ
V
40
µs
15
ms
DMD type TRP
610
mA
Output voltage
DMD type TRP
10
V
DC output voltage accuracy
DMD type TRP, IOUT= 10 mA
DC Load regulation
DMD type TRP, IOUT= 0 to 10 mA
DC Line regulation
DMD type TRP, IOUT= 10 mA, DRST_VIN = 8
V to 20 V
VRIPPLE
Output ripple
DMD type TRP, IOUT= 10 mA, COUT= 1 µF
IOUT
Output current
DMD type TRP
VOFFSET rising
PGOOD
Power-good threshold
(fraction of nominal output
voltage)
VOFFSET REGULATOR
VOFFSET
-0.3
0.3
V
–10
V/A
–5
mV/V
200
0.1
mVpp
10
mA
86%
VOFFSET falling
66%
(4)
C
Output capacitor
DMD type TRP, Recommended value (use
same value as output capacitor on VRESET)
1
µF
tDISCHARGE 5ms
Start main supply
DMD_VRESET
>10ms
>10ms
>10ms
Digital state machine control only
>10ms
1 to
320ms
0 to
320ms
Digital state machine & SPI control
Arrows indicate sequence of events automatically controlled by digital state machine. Other events are initiated under
SPI control.
Figure 1. Powerup Timing
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Feature Description (continued)
7.3.1.2 Monitoring
Several possible faults are monitored by the DLPA3005. If a fault has occurred and what kind of fault it is can be
read in register 0x0C. Subsequently, an interrupt can be generated if such a fault occurs. The fault conditions for
which an interrupt is generated can be configured individually in register 0x0D.
7.3.1.2.1 Block Faults
Fault conditions for several supplies can be observed such as the low voltage supplies (SUPPLY_FAULT).
ILLUM_FAULT monitors correct supply and voltage levels in the illumination block and DMD_FAULT monitors a
correct functioning DMD block. The PROJ_ON_INT bit indicates if PROJ_ON was asserted.
7.3.1.2.2 Low Battery and UVLO
Monitoring is also done on the battery voltage (input supply) by the low battery warning (BAT_LOW_WARN) and
battery low shutdown (BAT_LOW_SHUT), Figure 2. They warn for a low VIN supply voltage or automatically
shutdown the DLPA3005 when the VIN supply drops below a predefined level respectively. The threshold levels
for these fault conditions can be set from 3.9 V to 18.4 V by writing to registers 0x10 (LOWBATT) and
0x11 (BAT_LOW_SHUT_UVLO). These threshold levels have hysteresis. This hysteresis depends on the
selected threshold voltage and is depicted in Figure 3. It is recommended to set the low battery voltage higher
than the under voltage lock out such that a warning is generated before the device goes into shutdown.
VINA 85
VREF
SYSPWR
1µ
16V
0x0C
BAT_LOW_SHUT
0x11
UVLO_SEL
AGND 86
0x0C
BAT_LOW_WARN
0x10
LOWBATT_SEL
Figure 2. Battery Voltage Monitoring
0.14
HYSTERESIS (V)
0.12
0.1
0.08
0.06
0.04
0.02
0
4
6
8
10
12
14
TRIM SETTING (V)
16
18
20
D002
Figure 3. Hysteresis on VLOW_BAT and VUVLO
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Feature Description (continued)
7.3.1.2.3 Auto LED Turn Off Functionality
The PAD devices can be supplied from either a battery pack or an adapter. The PAD devices use several
warning and detection levels, as indicated in the previous paragraphs, to prevent system damage in case the
supply voltage becomes too low or even interrupted.
Interruption of the supply voltage occurs when, for example, the adapter is switched to another mains outlet. In
case a battery pack is installed, the system power control should switch at that moment to the battery pack. A
change of supply voltage from, for example, 20 V to 8 V can occur, and thus the OVP level (which is ratio metric,
see section Ratio Metric Overvoltage Protection) could become lower than VLED. An OVP fault will be triggered
and the system switches off.
The Auto_LED_Turn_Off functionality can be used to prevent the system from turning off in these circumstances.
This function disables the LEDs when the supply voltage drops below LED_AUTO_OFF_LEVEL (reg 0x18h). It is
advisable to have this level the same as the BAT_LOW_WARN level. When the Auto_LED_Turn_Off functionality
is enabled (reg 0x01h), once a supply voltage drop is detected to below LED_AUTO_OFF_LEVEL, the LEDs will
be switched off and the system should start sending lower current levels to have a lower VLED. After start using
lower currents, the LEDs can be switched on again by disabling AUTO_LED_TURN_OFF function. As a result
the system can continue working at the lower supply voltage using a lower intensity. The system has to monitor
the BAT_LOW_WARN status and once the mains adapter is plugged in again (seen by BAT_LOW_WARN being
low), the Auto_LED_Turn_Off functionality can be enabled again. Now the LED currents can be restored to their
original levels from before the supply voltage drop.
7.3.1.2.4 Thermal Protection
The chip temperature is monitored constantly to prevent overheating of the device. There are two levels of fault
condition (register 0x0C). The first is to warn for overheating (TS_WARN). This is an indication that the chip
temperature raises to a critical temperature. The next level of warning is TS_SHUT. This occurs at a higher
temperature than TS_WARN and will shutdown the chip to prevent permanent damage. Both temperature faults
have hysteresis on their levels to prevent rapid switching around the temperature threshold.
7.3.2 Illumination
The illumination function includes all blocks needed to generate light for the DLP system. In order to accurately
set the current through the LEDs, a control loop is used (Figure 4). The intended LED current is set through
IDAC[9:0]. The Illumination driver controls the LED anode voltage VLED and as a result a current will flow through
one of the LEDs. The LED current is measured via the voltage across sense resistor RLIM. Based on the
difference between the actual and intended current, the loop controls the output of the buck converter (VLED)
higher or lower. The LED which conducts the current is controlled by switches P, Q, and R. The Openloop
feedback circuitry" ensures that the control loop can be closed for cases when there is no path via the LED (for
instance, when ILED= 0).
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Feature Description (continued)
SYSPWR
ILLUMINATION
DRIVER
A (B)
100n
16V
LOUT
LDO
ILLUM
COUT
VLED
³2SHQORRS´
feedback
circuitry
PEXT
RGB
STROBE
DECODER
QEXT
REXT
IDAC[0:9]
RLIM
Figure 4. Illumination Control Loop
Within the illumination block, the following blocks can be distinguished:
• Programmable Gain Block
• LDO illum, analog supply voltage for internal illumination blocks
• Illumination driver A, primary driver for the external FETs
• Illumination driver B, secondary driver – for future purpose. Will not be discussed
• RGB stobe decoder, driver for external switches to control the on-off rhythm of the LEDs and measures the
LED current
7.3.2.1 Programmable Gain Block
The current through the LEDs is determined by a digital number stored in the respective IDAC registers 0x03h to
0x08h. These registers determine the LED current which is measured through the sense resistor RLIM. The
voltage across RLIM is compared with the current setting from the IDAC registers and the loop regulates the
current to its set value.
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Feature Description (continued)
Gain
ILLUMINATION
Buck Converter
LOUT
VLED
rLED
COUT
RWIRE
RON
VRLIM
RLIM
Figure 5. Programmable Gain Block in the Illumination Control Loop
When current is flowing through an LED, a forward voltage is built up over the LED. The LED also represents a
(low) differential resistance which is part of the load circuit for VLED. Together with the wire resistance (RWIRE) and
the RON resistance of the FET switch a voltage divider is created with RLIM that is a factor in the loop gain of the
ILED control. Under normal conditions, the loop is able to produce a well regulated LED current up to 16 Amps.
Since this voltage divider is part of the control loop, care must be taken while designing the system.
When, for instance, two LEDs in series are connected, or when a relatively high wiring resistance is present in
the loop, the loop gain will reduce due to the extra attenuation caused by the increased series resistances of rLED
+ RWIRE +RON. As a result, the loop response time lowers. To compensate for this increased attenuation, the loop
gain can be increased by selecting a higher gain for the programmable gain block. The gain increase can be set
through register 0x25h [3:0].
Under normal circumstances the default gain setting (00h) is sufficient. In case of a series connection of two
LEDs setting 01h or 02h might suffice.
As discussed before, wiring resistance also impacts the control-loop performance. It is advisable to prevent
unnecessary large wire length in the loop. Keeping wiring resistance as low as possible is good for efficiency
reasons. In case wiring resistance still impacts the response time of the loop, an appropriate setting of the gain
block can be selected. The same goes for connector resistance and PCB tracks. Keep in mind that basically
every milliohm counts. Following these precautions will help get a proper functioning of the ILED current loop.
7.3.2.2 LDO Illumination
This regulator is dedicated to the illumination block and provides an analog supply of 5.5 V to the internal
circuitry. It is recommended to use 1-µF capacitors on both the input and output of the LDO.
7.3.2.3 Illumination Driver A
The illumination driver of the DLPA3005 is a buck controller for driving two external low-ohmic N-channel FETs
(Figure 6). The theory of operation of a buck converter is explained in the application note Understanding Buck
Power Stages in Switchmode Power Supplies (SLVA057). For proper operation, selection of the external
components is very important, especially the inductor LOUT and the output capacitor COUT. For best efficiency and
ripple performance, an inductor and capacitor should be chosen with low equivalent series resistance (ESR).
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Feature Description (continued)
29
ILLUM_A_FB
30
ILLUM_A_VIN
28
ILLUM_A_BOOST
SYSPWR
2x68µ
16V
DG
ILLUMINATION
DRIVER
A
26
ILLUM_HSIDE_DRIVE
31
ILLUM_A_SW
100n
16V
RG
CG
LOUT
1µH
20A
DG
27
ILLUM_LSIDE_DRIVE
32
ILLUM_A_PGND
RG
CG
VLED
COUT
2x68µ
10V
Low_ESR
Figure 6. Typical Illumination Driver Configuration
Several factors determine the component selection of the buck converter, such as input voltage (SYSPWR),
desired output voltage (VLED) and the allowed output current ripple. Configuration starts with selecting the
inductor LOUT.
The value of the inductance of a buck power stage is selected such that the peak-to-peak ripple current flowing
in the inductor stays within a certain range. Here, the target is set to have an inductor current ripple, kI_RIPPLE,
less than 0.3 (30%). The minimum inductor value can be calculated given the input and output voltage, output
current, switching frequency of the buck converter (ƒSWITCH= 600 kHz), and inductor ripple of 0.3 (30%):
L OUT
VOUT
˜ ( VIN VOUT )
VIN
k I _ RIPPLE ˜ IOUT ˜ fSWITCH
(1)
Example: VIN= 12 V, VOUT= 4.3 V, IOUT= 16 A results in an inductor value of LOUT= 1 µH
Once the inductor is selected, the output capacitor COUT can be determined. The value is calculated using the
fact that the frequency compensation of the illumination loop has been designed for an LC-tank resonance
frequency of 15 kHz:
1
15kHz
fRES
2 ˜ S ˜ L OUT ˜ COUT
(2)
Example: COUT= 110 µF given that LOUT= 1 µH. A practical value is 2 × 68 µF. Here, a parallel connection of two
capacitors is chosen to lower the ESR even further.
The selected inductor and capacitor determine the output voltage ripple. The resulting output voltage ripple
VLED_RIPPLE is a function of the inductor ripple kI_RIPPLE, output current IOUT, switching frequency ƒSWITCH and the
capacitor value COUT:
k I _ RIPPLE ˜ IOUT
VLED _ RIPPLE
8 ˜ fSWITCH ˜ COUT
(3)
Example: kI_RIPPLE= 0.3, IOUT= 16 A, ƒSWITCH= 600 kHz and COUT= 2 x 68 µF results in an output voltage ripple of
VLED_RIPPLE= 7 mVpp
As can be seen, this is a relative small ripple.
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Feature Description (continued)
It is strongly advised to keep the capacitance value low. The larger the capacitor value the more energy is
stored. In case of a VLED going down stored energy needs to be dissipated. This might result in a large discharge
current. For a VLED step down from V1 to V2, while the LED current was I1. The theoretical peak reverse current
is:
I 2 , MAX
C OUT
2
u V1
L OUT
V2
2
I1
2
(4)
Depending on the selected external FETs, the following three components might need to be added for each
power FET:
• Gate series resistor (RG)
• Gate series diode (DG)
• Gate parallel capacitance (CG)
It is advisable to have placeholders for these components in the board design.
The gate series resistors can be used to slow down the enable transient of the power FET. Since large currents
are being switched, a fast transient implies a potential risk on ringing. Slowing down the turn-on transient reduces
the edge steepness of the drain current and thus reduces the induced inductive ringing. A resistance of a few
Ohm typically is sufficient.
The gate series resistance is also present in the turn-off transient of the power FET. This might have a negative
effect on the non-overlap timing. In order to keep the turn-off transient of the power FET fast, a parallel diode
with the gate series resistance can be used. The cathode of the diode should be directed to the DLPA3005
device in order have fast gate pull-down.
A third component that might be needed, depending on the specific configuration and FET selection, is an extra
gate-source filter capacitance. Specifically for the higher supply voltages this capacitance is advisable. Due to a
large drain voltage swing and the drain-gate capacitance, the gate of a disabled power FET might be pulled high
parasitically.
For the low-side FET this can happen at the end of the non-overlap time while the power converter is supplying
current. For that case the switch node is low at the end of the non-overlap time. Enabling the high-side FET pulls
high the switch node. Due to the large and steep switch node edge, charge is being injected via the drain-gate
capacitance of the low-side FET into the gate of the low-side FET. As a result the low-side FET can be enabled
for a short period of time causing a shoot-through current.
For the high-side FET a dual case exists. If the power converter is discharging VLED, the power converter
current is directed inward and thus at the end of the non-overlap time the switch node is high. If at that moment
the low-side FET is enabled, via the gate-drain capacitance of the high-side FET charge is being injected into the
gate of the high-side FET potentially causing the device to switch on for a short amount of time. That will cause a
shoot through current as well.
To reduce the effect of the charge injection via the drain-gate capacitance, an extra gate-source filter
capacitance can be used. Assuming a linear voltage division between gate-source capacitance and gate-drain
capacitance, for a 20V supply voltage the ratio of gate-source capacitance and gate-drain capacitance should be
kept to about 1:10 or larger. It is advised to carefully test the gate-drive signals and the switch node for potential
cross conduction.
Sometimes dual FETs are being used in order to spread out power dissipation (heat). In order to prevent
parasitic gate-oscillation a structure as shown in Figure 7 is suggested. Each gate is being isolated with RISO to
damp potential oscillations. A resistance of 1 Ohm is typically sufficient.
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Feature Description (continued)
DG
RISO
RG
RISO
CG
Figure 7. Using RISO to Prevent Gate Oscillations When Using Power FETs in Parallel
Finally two other components need to be selected in the buck converter. The value of the input-capacitor (pin
ILLUM_A_VIN) should be equal or greater than the selected output capacitance COUT, in this case ≥2 x 68 µF.
The capacitor between ILLUM_A_SWITCH and ILLUM_A_BOOST is a charge pump capacitor to drive the high
side FET. The recommended value is 100 nF.
7.3.2.4 RGB Strobe Decoder
The DLPA3005 contains circuitry to sequentially control the three color-LEDs (red, green and blue). This circuitry
consists of three drivers to control external switches, the actual strobe decoder and the LED current control
(Figure 8). The NMOS switches are connected to the cathode terminals of the external LED package and turn
the currents through the LEDs on and off.
From LDO_ILLUM
From ILLUM_A_FB
(VLED)
PINT
QINT
RINT
PEXT
RGB
STROBE
DECODER
19 CH1_GATE_CTRL
QEXT
20 CH2_GATE_CTRL
21 CH3_GATE_CTRL
REXT
15 RLIM_K_1
14 RLIM_BOT_K_1
13 RLIM_K_2
12 RLIM_BOT_K_2
60 CH_SEL_0
61 CH_SEL_1
9.4m
2W
From host
From host
Figure 8. Switch Connection for a Common-Anode LED Assembly
The NMOS FET’s P, Q, and R are controlled by the CH_SEL_0 and CH_SEL_1 pins. CH_SEL[1:0] typically
receive a rotating code switching from RED to GREEN to BLUE and then back to RED. The relation between
CH_SEL[0:1] and which switch is closed is indicated in Table 1.
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Feature Description (continued)
Table 1. Switch Positions for Common Anode RGB LEDs
SWITCH
PINS CH_SEL[1:0
IDAC REGISTER
P
Q
R
00
Open
Open
Open
N/A
01
Closed
Open
Open
0x03 and 0x04 SW1_IDAC[9:0]
10
Open
Closed
Open
0x05 and 0x06 SW2_IDAC[9:0]
11
Open
Open
Closed
0x07 and 0x08 SW3_IDAC[9:0]
Besides enabling one of the switches, CH_SEL[1:0] also selects a 10-bit current setting for the control IDAC that
is used as the set current for the LED. This set current together with the measured current through RLIM is used
to control the illumination driver to the appropriate VLED. The current through the 3 LEDs can be set
independently by registers 0x03 to 0x08 (Table 1).
Each current level can be set from off to 150mV/RLIM in 1023 steps:
Led current( A ) 0 for bit value 0
Led current( A )
Bit value
1024
1 150mV
˜
for bit value
RLIM
1 to 1023
(5)
The maximum current for RLIM= 9.4 mΩ is thus 16 A.
For proper operation a minimum LED current of 5% of ILED_MAX is required.
7.3.2.4.1 Break Before Make (BBM)
The switching of the three LED NMOS switches (P, Q, R) is controlled such that a switch is returned to the
OPEN position first before the subsequent switch is set to the CLOSED position (BBM), Figure 9. The dead time
between opening and closing switches is controlled through the BBM register (0x0E). Switches that already are
in the CLOSED position and are to remain in the CLOSED state, are not opened during the BBM delay time.
ILED
BBM dead time (0x0E)
P
Q
R
P
Figure 9. BBM Timing
7.3.2.4.2 Openloop Voltage
Several situations exist in which the control loop for the buck converter through the LED is not present. In order
to prevent the output voltage of the buck converter to “run-away”, the loop is closed by means of an internal
resistive divider (see Figure 4 - Openloop feedback circuitry). Situations in which the openloop voltage control is
active:
• During the BBM period. Transitions from one LED to another implies that during the BBM time all LEDs are
off.
• Current setting for all three LEDs is 0.
It’s advised to set the openloop voltage to about the lowest LED forward voltage. The openloop voltage can be
set between 3 V and 18 V in steps of 1 V through register 0x18.
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7.3.2.4.3 Transient Current Limit
Current
overshoot
SW_IDAC
TIME
RED LED CURRENT (mA)
RED LED CURRENT (mA)
Typically the forward voltages of the GREEN and BLUE diodes are close to each other (about 3 V to 5 V)
however the forward voltage of the red diode is significantly lower (2 V to 4 V). This can lead to a current spike in
the RED diode when the strobe controller switches from green or blue to red. This happens because VLED is
initially at a higher voltage than required to drive the red diode. DLPA3005 provides transient current limiting for
each switch to limit the current in the LEDs during the transition. The transient current limit value is controlled via
register 0x02 (ILLUM_ILIM). In a typical application it is required only for the RED diode. The value for
ILLUM_ILIM should be set at least 20% higher than the DC regulation current. Register 0x02
(ILLUM_SW_ILIM_EN) contains three bits to select which switch employs the transient current limiting feature.
The effect of the transient current limit on the LED current is shown in Figure 10.
Transient current
limit active
ILLUM_ILIM
SW_IDAC
TIME
Figure 10. LED Current Without (Left) and With (Right) Transient Current Limit
7.3.2.5 Illumination Monitoring
The illumination block is continuously monitored for system failures to prevent damage to the DLPA3005 and
LEDs. Several possible failures are monitored such as a broken control loop and a too high or too low output
voltage VLED. The overall illumination fault bit is in register 0x0C (ILLUM_FAULT). If any of the below failures
occur, the ILLUM_FAULT bit may be set high:
• ILLUM_BC1_PG_FAULT
• ILLUM_BC1_OV_FAULT
Where, PG= Power Good and OV= Over Voltage
7.3.2.5.1 Power Good
Both the Illumination driver and the Illumination LDO have a power good indication. The power good for the
driver indicates if the output voltage (VLED) is within a defined window indicating that the LED current has
reached the set point. If for some reason the LED current cannot be controlled to the intended value, this fault
occurs. Subsequently, bit ILLUM_BC1_PG_FAULT in register 0x27 is set high. The illumination LDO output
voltage is also monitored. When the power good of the LDO is asserted it implies that the LDO voltage is below
a pre-defined minimum of 80% (rising) or 60% (falling) edge. The power good indication for the LDO is in register
0x27 (V5V5_LDO_ILLUM_PG_FAULT).
7.3.2.5.2 Ratio Metric Overvoltage Protection
The DLPA3005 illumination driver LED outputs are protected against open circuit use. In case no LED is
connected and the PAD device is instructed to set the LED current to a specific level, the LED voltage
(ILLUM_A_FB) will quickly rise and potentially rail to VIN. This should be prevented. The OVP protection circuit
triggers once VLED crosses a predefined level. As a result the DLPA3005 will be switched off.
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The same protection circuit is triggered in case the supply voltage (VINA) will become too low to have the
DLPA3005 work properly given the VLED level. This protection circuit is constructed around a comparator that will
sense both the LED voltage and the VINA supply voltage. The fraction of the VINA is connected to the minus
input of the comparator while the fraction of the VLED voltage is connected to the plus input. Triggering occurs
when the plus input rises above the minus input and an OVP fault is set. The fraction of the VINA must be set
between 1 V and 4 V to ensure proper operation of the comparator.
ILLUM_A_FB
(VLED)
VINA
Settings:
reg 0x19h [4:0]
VLED / VLED_RATIO
Settings:
reg 0x0Bh [4:0]
+
OVP_trigger
VINA / VINA_RATIO
1V< VIN- 250 ms later followed by writing a 0 to the
same register.
To check if the registers are unlocked, read back the PASSWORD register 0x2E. If the data returned is 0x00h,
the registers are locked. If the PASSWORD register returns 0x01h, the registers are unlocked.
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7.6 Register Maps
Register Address, Default, R/W, Register name. Boldface settings are the hardwired defaults.
Table 8. Register Map
NAME
BITS
DESCRIPTION
0x00, E3, R/W, Chip Identification
CHIPID
[7:4]
Chip identification number: E (hex)
REVID
[3:0]
Revision number, 3 (hex)
0x01, 82, R/W, Enable Register
FAST_SHUTDOWN_EN
[7]
0: Fast shutdown disabled
1: Fast shutdown enabled
CW_EN
[6]
0: Color wheel circuitry disabled
1: Color wheel circuitry enabled
BUCK_GP3_EN
[5]
0: General purpose buck3 disabled
1: Generale purpose buck3 enabled
BUCK_GP2_EN
[4]
0: General purpose buck2 disabled
1: General purpose buck2 enabled
BUCK_GP1_EN
[3]
0: General purpose buck1 disabled
1: General purpose buck1 enabled
ILLUM_LED_AUTO_OFF_EN
[2]
0: Illum_led_auto_off_en disabled
1: Illum_led_auto_off_en enabled
ILLUM_EN
[1]
0: Illum regulators disabled
1: Illum regulators enabled
DMD_EN
[0]
0: DMD regulators disabled
1: DMD regulators enabled
[7]
Reserved, values don't care
0x02, 70, R/W, IREG Switch Control
Rlim voltage top-side (mV). Illum current limit = Rlim voltage / Rlim
ILLUM_ILIM
ILLUM_SW_ILIM_EN
[6:3]
0000: 17
1000: 73
0001: 20
1001: 88
0010: 23
1010: 102
0011: 25
1011: 117
0100: 29
1100: 133
0101: 37
1101: 154
0110: 44
1110: 176
0111: 59
1111: 197
[2:0]
Bit2: CH3, MOSFET R transient current limit (0:disabled, 1:enabled)
Bit1: CH2, MOSFET Q transient current limit (0:disabled, 1:enabled)
Bit0: CH1, MOSFET P transient current limit (0:disabled, 1:enabled)
[7:2]
Reserved, values don't care
[1:0]
Led current of CH1(A) = ((Bit value + 1)/1024) × (150 mV / Rlim), Most significant bits of 10
bits register (register 0x03 and 0x04).
00 0000 0000 [OFF]
00 0011 0011 [(52/1024) × (150mV/Rlim)], Minimum code.
….
11 1111 1111 [150mV/Rlim]
0x03, 00, R/W, SW1_IDAC(1)
SW1_IDAC
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Register Maps (continued)
Table 8. Register Map (continued)
NAME
BITS
DESCRIPTION
0x04, 00, R/W, SW1_IDAC(2)
SW1_IDAC
[7:0]
Led current of CH1(A) = ((Bit value + 1)/1024) × (150 mV / Rlim), Least significant bits of 10
bits register (register 0x03 and 0x04).
00 0000 0000 [OFF]
00 0011 0011 [(52/1024) × (150mV/Rlim)], Minimum code.
….
11 1111 1111 [150mV/Rlim]
[7:2]
Reserved, value don’t care.
[1:0]
Led current of CH2(A) = ((Bit value + 1)/1024) × (150 mV / Rlim), Most significant bits of 10
bits register (register 0x05 and 0x06).
00 0000 0000 [OFF]
00 0011 0011 [(52/1024) × (150mV/Rlim)], Minimum code.
….
11 1111 1111 [150mV/Rlim]
[7:0]
Led current of CH2(A) = ((Bit value + 1)/1024) × (150 mV / Rlim), Least significant bits of 10
bits register (register 0x05 and 0x06).
00 0000 0000 [OFF]
00 0011 0011 [(52/1024) × (150mV/Rlim)], Minimum code.
….
11 1111 1111 [150mV/Rlim]
[7:2]
Reserved, value don’t care.
[1:0]
Led current of CH3(A) = ((Bit value + 1)/1024) × (150 mV / Rlim), Most significant bits of 10
bits register (register 0x07 and 0x08).
00 0000 0000 [OFF]
00 0011 0011 [(52/1024) × (150mV/Rlim)], Minimum code.
….
11 1111 1111 [150mV/Rlim]
[7:0]
Led current of CH3(A) = ((Bit value + 1)/1024) × (150 mV / Rlim), Least significant bits of 10
bits register (register 0x07 and 0x08).
00 0000 0000 [OFF]
00 0011 0011 [(52/1024) × (150mV/Rlim)], Minimum code.
….
11 1111 1111 [150mV/Rlim]
0x05, 00, R/W, SW2_IDAC(1)
SW2_IDAC
0x06, 00, R/W, SW2_IDAC(2)
SW2_IDAC
0x07, 00, R/W, SW3_IDAC(1)
SW3_IDAC
0x08, 00, R/W, SW3_IDAC(2)
SW3_IDAC
0x09, 00, R/W, Switch ON/OFF Control
SW3
[7]
Only used if DIRECT MODE is enabled (see register 0x2F)
0: SW3 disabled
1: SW3 enabled
SW2
[6]
Only used if DIRECT MODE is enabled (see register 0x2F)
0: SW2 disabled
1: SW2 enabled
SW1
[5]
Only used if DIRECT MODE is enabled (see register 0x2F)
0: SW1 disabled
1: SW1 enabled
[4:0]
Reserved, value don’t care.
0x0A, 00, R/W, Analog Front End (1)
AFE_EN
[7]
0: Analog front end disabled
1: Analog front end enabled
AFE_CAL_DIS
[6]
0: Calibrated 18x AFE_VGA
1: Uncalibrated 18x AFE_VGA
AFE_GAIN
[5:4]
Copyright © 2015, Texas Instruments Incorporated
Gain analog front end gain
00: Off
01: 1x
10: 9.5x
11: 18x
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Register Maps (continued)
Table 8. Register Map (continued)
NAME
BITS
DESCRIPTION
[3:0]
Selected analog multiplexer input
0000: ILLUM_A_FB/xx, where xx is controlled by VLED_OVP_VLED_RATIO
(reg0x19)
0001: ILLUM_B_FB/xx, where xx is controlled by VLED_OVP_VLED_RATIO (reg0x19)
0010: VIN/xx, where xx is controlled by ILLUM_LED_AUTO_OFF_SEL (reg0x18)
0011: V_LABB
0100: RLIM_K1
0101: RLIM_K2
0110: CH1_SWITCH
0111: CH2_SWITCH
1000: CH3_SWITCH
1001: VREF_1V2
1010: VOTS (Main temperature sense block output voltage)
1011: VPROG1/12 (EEPROM block1 programming voltage divided by 12)
1100: VPROG2/12 (EEPROM block2 programming voltage divided by 12)
1101: ACMPR_IN_1
1110: ACMPR_IN_2
1111: ACMPR_IN_3
TSAMPLE_SEL
[7:6]
Samples time LABB Sensor (µs)
00: 7
01: 14
10: 21
11: 28
SAMPLE_LABB
[5]
AFE_SEL
0x0B, 00, R/W, Analog Front End (2)
0: LABB SAMPLING disabled
1: START LABB SAMPLING (auto reset to 0 after TSAMPLE_SEL time).
OVP_VIN Division factor.
VLED_OVP_VIN_RATIO
[4:0]
00000: 3.33
01000: 6.10
10000: 9.16
11000: 12.51
00001: 4.98
01001: 6.23
10001: 9.60
11001: 12.94
00010: 5.23
01010: 6.67
10010: 9.99
11010: 13.31
00011: 5.32
01011: 7.11
10011: 10.41
11011: 13.70
00100: 5.42
01100: 7.50
10100: 10.88
11100: 14.11
00101: 5.52
01101: 7.96
10101: 11.26
11101: 14.56
00110: 5.62
01110: 8.34
10110: 11.67
11110: 15.04
00111: 5.85
01111: 8.77
10111: 12.11
11111: 15.41
0x0C, 00, R, Main Status Register
SUPPLY_FAULT
[7]
0: No PG or OV failures for any of the LV Supplies
1: PG failures for a LV Supplies
ILLUM_FAULT
[6]
0: ILLUM_FAULT = LOW
1: ILLUM_FAULT = HIGH
PROJ_ON_INT
[5]
0: PROJ_ON = HIGH
1: PROJ_ON = LOW
DMD_FAULT
[4]
0: DMD_FAULT = LOW
1: DMD_FAULT = HIGH
BAT_LOW_SHUT
[3]
0: VIN > UVLO_SEL
1: VIN < UVLO_SEL
BAT_LOW_WARN
[2]
0: VIN > LOWBATT_SEL
1: VIN < LOWBATT_SEL
TS_SHUT
[1]
0: Chip temperature < 132.5°C and no violation in V5V0
1: Chip temperature > 156.5°C, or violation in V5V0
TS_WARN
[0]
0: Chip temperature < 121.4°C
1: Chip temperature > 123.4°C
[7]
0: Not masked for SUPPLY_FAULT interrupt
1: Masked for SUPPLY_FAULT interrupt
0x0D, F5, Interrupt Mask Register
SUPPLY_FAULT_MASK
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Register Maps (continued)
Table 8. Register Map (continued)
NAME
BITS
DESCRIPTION
ILLUM_FAULT_MASK
[6]
0: Not masked for ILLUM_FAULT interrupt
1: Masked for ILLUM_FAULT interrupt
PROJ_ON_INT_MASK
[5]
0: Not masked for PROJ_ON_INT interrupt
1: Masked for PROJ_ON_INT interrupt
DMD_FAULT_MASK
[4]
0: Not masked for DMD_FAULT interrupt
1: Masked for DMD_FAULT interrupt
BAT_LOW_SHUT_MASK
[3]
0: Not masked for BAT_LOW_SHUT interrupt
1: Masked for BAT_LOW_SHUT interrupt
BAT_LOW_WARN_MASK
[2]
0: Not masked for BAT_LOW_WARN interrupt
1: Masked for BAT_LOW_WARN interrupt
TS_SHUT_MASK
[1]
0: Not masked for TS_SHUT interrupt
1: Masked for TS_SHUT interrupt
TS_WARN_MASK
[0]
0: Not masked for TS_WARN interrupt
1: Masked for TS_WARN interrupt
0x0E, 00, R/W, Break-Before-Make Delay
BBM_DELAY
[7:0]
Break before make delay register (ns), step size is 111 ns
0000 0000: 0
0000 0001: 333
0000 0010: 444
0000 0011: 555
….
1111 1101: 28305
1111 1110: 28416
1111 1111: 28527
0x0F, 07, R/W, Fast Shutdown Timing
VOFS/RESETZ_DEL
AY (µs)
VOFS/RESETZ_DELAY
[7:4]
0000: 4.000 – 4.445
1000: 6.230 – 7.120
0001: 8.010 – 8.900
1001: 12.46 – 14.24
0010: 16.02 – 17.80
1010: 24.89 – 28.44
0011: 32.00 – 35.55
1011: 49.77 – 56.88
0100: 63.99 – 71.10
1100: 99.5 – 113.8
0101: 128.0 – 142.2
1101: 199.1 – 227.6
0110: 256.0 – 284.5
1110: 398.3 – 455.2
0111: 512.1 – 569.0
1111: 1024.2 –
1138.0
VBIAS/VRST_DELAY
(µs)
VBIAS/VRST_DELAY
[3:0]
0000: 4.000 – 4.445
1000: 6.230 – 7.120
0001: 8.010 – 8.900
1001: 12.46 – 14.24
0010: 16.02 – 17.80
1010: 24.89 – 28.44
0011: 32.00 – 35.55
1011: 49.77 – 56.88
0100: 63.99 – 71.10
1100: 99.5 – 113.8
0101: 128.0 – 142.2
1101: 199.1 – 227.6
0110: 256.0 – 284.5
1110: 398.3 – 455.2
0111: 512.1 – 569.0
1111: 1024.2 –
1138.0
0x10, C0, R/W, VOFS State Duration
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Register Maps (continued)
Table 8. Register Map (continued)
NAME
BITS
VOFS_STATE_DURATION
[7:5]
DESCRIPTION
Duration of VOFS state (ms)
000: 1
001: 5
010: 10
011: 20
100: 40
101: 80
110: 160
111: 320
Low Battery level Selection
LOWBATT_SEL
[4:0]
00000: 3.93
01000: 7.27
10000: 10.94
11000: 14.96
00001: 5.92
01001: 7.43
10001: 11.46
11001: 15.47
00010: 6.21
01010: 7.95
10010: 11.92
11010: 15.91
00011: 6.32
01011: 8.46
10011: 12.42
11011: 16.37
00100: 6.43
01100: 8.93
10100: 12.97
11100: 16.87
00101: 6.55
01101: 9.47
10101: 13.42
11101: 17.40
00110: 6.67
01110: 9.92
10110: 13.91
11110: 17.96
00111: 6.93
01111: 10.42
10111: 14.43
11111: 18.41
0x11, 00, R/W, VBIAS State Duration
VBIAS_STATE_DURATION
[7:5]
Duration of VBIAS state (ms)
000: bypass
001: 5
010: 10
011: 20
100: 40
101: 80
110: 160
111: 320
Under Voltage Lockout level Selection
UVLO_SEL
[4:0]
00000: 3.93
01000: 7.27
10000: 10.94
11000: 14.96
00001: 5.92
01001: 7.43
10001: 11.46
11001: 15.47
00010: 6.21
01010: 7.95
10010: 11.92
11010: 15.91
00011: 6.32
01011: 8.46
10011: 12.42
11011: 16.37
00100: 6.43
01100: 8.93
10100: 12.97
11100: 16.87
00101: 6.55
01101: 9.47
10101: 13.42
11101: 17.40
00110: 6.67
01110: 9.92
10110: 13.91
11110: 17.96
00111: 6.93
01111: 10.42
10111: 14.43
11111: 18.41
0x13, 00, R/W, GP1 Buck Converter Voltage Selection
BUCK_GP1_TRIM
48
[7:0]
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General purpose1 buck output voltage = 1+ bit value * 15.69 (stepsize = 15.69 mV)
00000000 1 V
….
11111111 5 V
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Register Maps (continued)
Table 8. Register Map (continued)
NAME
BITS
DESCRIPTION
0x14, 00, R/W, GP2 Buck Converter voltage Selection
BUCK_GP2_TRIM
[7:0]
General purpose2 buck output voltage = 1+ bit value * 15.69 (stepsize = 15.69 mV)
00000000 1 V
….
11111111 5 V
0x15, 00, R/W, GP3 Buck Converter Voltage Selection
BUCK_GP3_TRIM
[7:0]
General purpose3 driver output voltage = 1+ bit value * 15.69 (stepsize = 15.69 mV)
00000000 1 V
….
11111111 5 V
[7:5]
Reserved, value don’t care.
[4:0]
Skip Mode:
Bit4: Buck_GP3 (0:disabled, 1:enabled)
Bit3: Buck_GP1 (0:disabled, 1:enabled)
Bit2: Buck_GP2 (0:disabled, 1:enabled)
Bit1: Buck_DMD1 (0:disabled, 1:enabled)
Bit0: Buck_DMD2 (0:disabled, 1:enabled)
0x16, 00, R/W, Buck Skip Mode
BUCK_SKIP_ON
0x17, 02, R/W, User Configuration Selection Register
[7]
0: SPI Clock from 0 to 36 MHz
1: SPI Clock from 20 to 40 MHz
[6]
Reserved, value don’t care.
ILLUM_EXT_LSD_CUR_LIM_EN
[5]
0: Current limiting disabled (External FETs mode)
1: Current limiting enabled (External FETs mode)
Reserved
[4]
ILLUM_3A_INT_SWITCH_SEL
[3]
ILLUM_DUAL_OUTPUT_CNTR_SE
L
[2]
ILLUM_INT_SWITCH_SEL
[1]
ILLUM_EXT_SWITCH_SEL
[0]
DIG_SPI_FAST_SEL
Illum Configuration: most significant bit is ILLUM_EXT_SWITCH_CAP (Reg0x26). Other
4 bits are of this register. “x” is don’t care.
x xx00: Off
x x110: 2 x 3 A Internal FETs
x 0010: 1 x 6 A Internal FETs
x 1010: 1 x 3 A Internal FETs
0 xx0x: Off
0 x11x: 2 x 3 A Internal FETs
0 001x: 1 x 6 A Internal FETs
0 101x: 1 x 3 A Internal FETs
0 xxx1: External FETs
0x18, 00, R/W, OLV -ILLUM_LED_AUTO_OFF_SEL
ILLUM_OLV_SEL
[7:4]
Copyright © 2015, Texas Instruments Incorporated
Illum openloop voltage (V) = 3 + bit value * 1 (stepsize = 1 V)
0000: 3 V
0001: 4 V
...
1110: 17 V
1111: 18 V
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Register Maps (continued)
Table 8. Register Map (continued)
NAME
ILLUM_LED_AUTO_OFF_SEL
BITS
[3:0]
DESCRIPTION
Bit value
Led Auto Off Level
(V)
VIN division factor
0000
3.93
3.33
0001
5.92
4.98
0010
6.21
5.23
0011
6.32
5.32
0100
6.43
5.42
0101
6.55
5.52
0110
6.67
5.62
0111
6.93
5.85
1000
7.27
6.10
1001
7.95
6.67
1010
8.93
7.50
1011
9.92
8.34
1100
10.94
9.16
1101
11.92
9.99
1110
12.97
10.88
1111
13.91
11.67
0x19, 1F, R/W, Illumination Buck Converter Overvoltage Fault Level
Reserved
[7:5]
Bit value / OVP VLED Division factor
VLED_OVP_VLED_RATIO
[4:0]
00000: 3.33
01000: 6.10
10000: 9.16
11000: 12.51
00001: 4.98
01001: 6.23
10001: 9.60
11001: 12.94
00010: 5.23
01010: 6.67
10010: 9.99
11010: 13.31
00011: 5.32
01011: 7.11
10011: 10.41
11011: 13.70
00100: 5.42
01100: 7.50
10100: 10.88
11100: 14.11
00101: 5.52
01101: 7.96
10101: 11.26
11101: 14.56
00110: 5.62
01110: 8.34
10110: 11.67
11110: 15.04
00111: 5.85
01111: 8.77
10111: 12.11
11111: 15.41
0x1B, 00, R/W, Color Wheel PWM Voltage(1)
CW_PWM
50
[7:0]
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Least significant 8 bits of 16 bits register (register 0x1B and 0x1C) Average color wheel PWM
voltage (V), step size = 76.294 µV
0x0000 0 V
....
0xFFFF 5 V
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DLPS071 – OCTOBER 2015
Register Maps (continued)
Table 8. Register Map (continued)
NAME
BITS
DESCRIPTION
0x1C, 00, R/W, Color Wheel PWM Voltage(2)
CW_PWM
[7:0]
Most significant 8 bits of 16 bits register (register 0x1B and 0x1C) Average color wheel PWM
voltage (V), step size = 76.294 µV
0x0000 0 V
....
0xFFFF 5 V
0x25, 00, R/W, ILLUM BUCK CONVERTER BANDWIDTH SELECTION
reserved
[7:4]
ILED CONTROL LOOP BANDWIDTH INCREASE (dB)
00: 0
ILLUM_BW_BC1
[3,2]
01: 1.9
10: 4.7
11: 9.3
ILED CONTROL LOOP BANDWIDTH INCREASE (dB)
00: 0
ILLUM_BW_BC2
[1,0]
01: 1.9
10: 4.7
11: 9.3
0x26, DF, R, Capability register
LED_AUTO_TURN_OFF_CAP
[7]
0: LED_AUTO_TURN_OFF_CAP disabled
1: LED_AUTO_TURN_OFF_CAP enabled
ILLUM_EXT_SWITCH_CAP
[6]
0: No external switch control capability
1: External switch control capability included
CW_CAP
[5]
0: No color wheel capability
1: Color wheel capability included
DMD type
[4]
0: VSP
1: TRP
DMD_LDO1_USE
[3]
0: LDO1 not used for DMD, voltage set by user register
1: LDO1 used for DMD, voltage set by EEPROM
DMD_LDO2 _USE
[2]
0: LDO2 not used for DMD, voltage set by user register
1: LDO2 used for DMD, voltage set by EEPROM
DMD_BUCK1 _USE
[1]
0: DMD Buck1 disabled
1: DMD Buck1 used
DMD_BUCK2 _USE
[0]
0: DMD Buck2 disabled
1: DMD Buck2 used
0x27, 00, R, Detailed status register1 (Power good failures for general purpose and illumination blocks)
BUCK_GP3_PG_FAULT
[7]
0: No fault
1: Focus motor buck power good failure. Does not initiate a fast shutdown.
BUCK_GP1_PG_FAULT
[6]
0: No fault
1: General purpose buck1 power good failure. Does not initiate a fast shutdown.
BUCK_GP2_PG_FAULT
[5]
0: No fault
1: General purpose buck2 power good failure. Does not initiate a fast shutdown.
Reserved
[4]
ILLUM_BC1_PG_FAULT
[3]
0: No fault
1: Illum buck converter1 power good failure. Does not initiate a fast shutdown.
ILLUM_BC2_PG_FAULT
[2]
0: No fault
1: Illum buck converter2 power good failure. Does not initiate a fast shutdown.
[1]
Reserved, value always 0
[0]
Reserved, value always 0
0x28, 00, R, Detailed status register2 (Overvoltage failures for general purpose and illum blocks)
BUCK_GP3_OV_FAULT
[7]
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0: No fault
1: Focus motor buck overvoltage failure. Does not initiate a fast shutdown.
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Register Maps (continued)
Table 8. Register Map (continued)
NAME
BITS
DESCRIPTION
BUCK_GP1_OV_FAULT
[6]
0: No fault
1: General purpose buck1 overvoltage failure. Does not initiate a fast shutdown.
BUCK_GP2_OV_FAULT
[5]
0: No fault
1: General purpose buck2 overvoltage failure. Does not initiate a fast shutdown.
[4]
Reserved, value always 0
ILLUM_BC1_OV_FAULT
[3]
0: No fault
1: Illum buck converter1 overvoltage failure. Does not initiate a fast shutdown.
ILLUM_BC2_OV_FAULT
[2]
0: No fault
1: Illum buck converter2 overvoltage failure. Does not initiate a fast shutdown.
[1]
Reserved, value always 0
[0]
Reserved, value always 0
0x29, 00, R, Detailed status register3 (Power good failure for DMD related blocks)
[7]
Reserved, value always 0
DMD_PG_FAULT
[6]
0: No fault
1: VBIAS, VOFS and/or VRST power good failure. Initiates a fast shutdown.
BUCK_DMD1_PG_FAULT
[5]
0: No fault
1: Buck1 (used to create DMD voltages) power good failure. Initiates a fast shutdown.
BUCK_DMD2_PG_FAULT
[4]
0: No fault
1: Buck2 (used to create DMD voltages) power good failure. Initiates a fast shutdown.
[3]
Reserved, value always 0
[2]
Reserved, value always 0
LDO_GP1_PG_FAULT /
LDO_DMD1_PG_FAULT
[1]
0: No fault
1: LDO1 (used as general purpose or DMD specific LDO) power good failure. Initiates a fast
shutdown.
LDO_GP2_PG_FAULT /
LDO_DMD2_PG_FAULT
[0]
0: No fault
1: LDO2 (used as general purpose or DMD specific LDO) power good failure. Initiates a fast
shutdown.
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Register Maps (continued)
Table 8. Register Map (continued)
NAME
BITS
DESCRIPTION
0x2A, 00, R, Detailed status register4 (Overvoltage failures for DMD related blocks and Color Wheel)
[7]
Reserved, value always 0
[6]
Reserved, value always 0
BUCK_DMD1_OV_FAULT
[5]
0: No fault
1: Buck1 (used to create DMD voltage) overvoltage failure
BUCK_DMD2_OV_FAULT
[4]
0: No fault
1: Buck2 (used to create DMD voltage) overvoltage failure
[3]
Reserved, value always 0
[2]
Reserved, value always 0
LDO_GP1_OV_FAULT /
LDO_DMD1_OV_FAULT
[1]
0: No fault
1: LDO1 (used as general purpose or DMD specific LDO) overvoltage failure
LDO_GP2_OV_FAULT /
LDO_DMD2_OV_FAULT
[0]
0: No fault
1: LDO2 (used as general purpose or DMD specific LDO) overvoltage failure
0x2B, 00, R, Chip ID extension
CHIP_ID_EXTENTION
[7:0]
ID extension to distinguish between various configuration options.
0x2C, 00, R/W, ILLUM_LED_AUTO_TURN_OFF_DELAY SETTINGS
Reserved
[7:4]
TBD
ILLUM_LED_AUTO_TURN_OFF_DELAY (µsec)
ILLUM_LED_AUTO_TURN_OFF_D
ELAY
[3:0]
0000: 4.000-4.445
0100: 63.99-71.10
1000: 6.230-7.120
1100: 99.5-113.8
0001: 8.010-8.900
0101: 128.0-142.2
1001: 12.46-14.24
1101: 199.1-227.6
0010: 16.02-17.80
0110: 256.0-284.5
1010: 24.89-28.44
1110: 398.3-455.2
0011: 32.00-35.55
0111: 512.1-569.0
1011: 49.77-56.88
1111: 1024.2-1138.0
0x2E, 00, R/W, User Password
USER PASSWORD (0xBABE)
[7:0]
Write Consecutively 0xBA and 0xBE to unlock.
0x2F, 00, R/W, User Protection Register
[7:3]
Reserved, value don’t care.
EEPROM_PROGRAM
[2]
0: EEPROM programming disabled
1: Shadow register values programmed to EEPROM
DIRECT_MODE
[1]
0: Direct mode disabled
1: Direct mode enabled (register 0x09 to control switched)
PROTECT_USER_REG
[0]
0: ALL regular USER registers are WRITABLE, except for READ ONLY registers
1: ONLY USER registers 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, and 0x09 are
WRITABLE
0x30, 00, R/W, User EEPROM
Register
USER_REGISTER1
[7:0]
User EEPROM Register1
0x31, 00, R/W, User EEPROM Register
USER_REGISTER2
[7:0]
User EEPROM Register2
0x32, 00, R/W, User EEPROM Register
USER_REGISTER3
[7:0]
User EEPROM Register3
0x33, 00, R/W, User EEPROM Register
USER_REGISTER4
[7:0]
User EEPROM Register4
0x34, 00, R/W, User EEPROM Register
USER_REGISTER5
[7:0]
User EEPROM Register5
0x35, 00, R/W, User EEPROM Register
USER_REGISTER6
[7:0]
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User EEPROM Register6
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8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
In display applications, using the DLPA3005 provides all needed analog functions including all analog power
supplies and the RGB LED driver (up to 16A per LED) to provide a robust and efficient display solution. Each
DLP application is derived primarily from the optical architecture of the system and the format of the data coming
into the DLPC3439 DLP controller chips.
8.2 Typical Application
A common application when using DLPA3005 is to use it with a 0.47 1080 DMD (DLP4710) and two DLPC3439
controllers for creating a small, ultra-portable projector. The DLPC3439s in the projector typically receive images
from a PC or video player using HDMI or VGA analog as shown in Figure 24. Card readers and Wi-Fi can also
be used to receive images if the appropriate peripheral chips are added. The DLPA3005 provides power supply
sequencing and control of the RGB LED currents as required by the application.
Projector Module
+ BAT -
SYSPWR
CHARGER
DC
SUPPLIES
FAN(S)
VGA
FRONTEND
CHIP
DLPC3439
eDRAM
3x BUCK
CONVERTER
(GEN.PURP)
PROJ_ON
DIGITAL
CONTROL
RESET_Z
SD CARD
READER,
VIDEO
DECODER,
etc
- OSD
- Autolock
- Scaler
- Deinterlacer
- KS Corr
- uController
DLPC3439
eDRAM
FLASH
OPTICS
DLPA3005
FLASH,
SDRAM
KEYPAD
External
Power
FETs
ILLUMINATION
FLASH
HDMI
RECEIVER
SUPPLIES
and
MONITORING
SENSORS
MEASUREMENT
SYSTEM
DMD HIGH
VOLTAGE
GENERATION
1080P
Processor
TRP-DMD
DMD/DPP
BUCKS
Buck 1.1V
Buck 1.8V
AUX LDOs
LDO 2.5V
LDO 3.3V
CTRL / DATA
TI Device
Non-TI Device
Figure 24. Typical Setup Using DLPA3005
8.2.1 Design Requirements
An ultra-portable projector can be created by using a DLP chip set comprised of a 0.47 1080 DMD (DLP4710),
two DLPC3439s controllers, and the DLPA3005 PMIC/LED Driver. The two DLPC3439s do the digital image
processing, the DLPA3005 provides the needed analog functions for the projector, and DMD is the display
device for producing the projected image. In addition to the three DLP chips in the chip set, other chips may be
needed. At a minimum a Flash part is needed to store the software and firmware to control the two DLPC3439s.
The illumination light that is applied to the DMD is typically from red, green, and blue LEDs. These are often
contained in three separate packages, but sometimes more than one color of LED die may be in the same
package to reduce the overall size of the projector. Power FETs are needed external to the DLPA3005 so that
high LED currents can be supported. For connecting the two DLPC3439s to the front end chip for receiving
images the parallel interface is typically used. While using the parallel interface, I2C should be connected to the
front end chip for inputting commands to the two DLPC3439s.
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Typical Application (continued)
The DLPA3005 has five built-in buck switching regulators to serve as projector system power supplies. Two of
the regulators are fixed to 1.1 V and 1.8 V for powering the DLP chip set. The remaining three buck regulators
are available for general purpose use and their voltages are programmable. These three regulators can be used
to drive variable-speed fans or to power other projector chips such as the front-end chip. The only power supply
needed at the DLPA3005 input is SYSPWR from an external DC power supply or internal battery. The entire
projector can be turned on and off by using a single signal called PROJ_ON. When PROJ_ON is high, the
projector turns on and begins displaying images. When PROJ_ON is set low, the projector turns off and draws
just microamps of current on SYSPWR.
8.2.2 Detailed Design Procedure
To connect the 0.47 1080 DMD (DLP4710), two DLPC3439s and DLPA3005, see the reference design
schematic. When a circuit board layout is created from this schematic a very small circuit board is possible. An
example small board layout is included in the reference design data base. Layout guidelines should be followed
to achieve reliable projector operation. The optical engine that has the LED packages and the DMD mounted to it
is typically supplied by an optical OEM who specializes in designing optics for DLP projectors.
The component selection of the buck converter is mainly determined by the output voltage. Table 9 shows the
recommended value for inductor LOUT and capacitor COUT for a given output voltage.
Table 9. Recommended Buck Converter LOUT and COUT
VOUT (V)
LOUT (µH)
COUT (µF)
MIN
TYP
MAX
MIN
MAX
1 - 1.5
1.5
2.2
4.7
22
68
1.5 - 3.3
2.2
3.3
4.7
22
68
3.3 - 5
3.3
4.7
22
68
The inductor peak-to-peak ripple current, peak current and RMS current can be calculated using Equation 8,
Equation 9 and Equation 10 respectively. The inductor saturation current rating must be greater than the
calculated peak current. Likewise, the RMS or heating current rating of the inductor must be greater than the
calculated RMS current. The switching frequency of the buck converter is approximately 600 kHz (ƒSWITCH).
VOUT
˜ ( VIN _ MAX VOUT )
VIN _ MAX
IL _ OUT _ RIPPLE _ P P
L OUT ˜ fSWITCH
(8)
IL _ OUT
_ PEAK
IL _ OUT(RMS)
IL _ OUT
IL _ OUT 2
IL _ OUT
_ RIPPLE _ P P
2
1
˜ IL _ OUT _ RIPPLE _ P
12
(9)
2
P
(10)
The capacitor value and ESR determines the level of output voltage ripple. The buck converter is intended for
use with ceramic or other low ESR capacitors. Recommended values range from 22 to 68 μF. Equation 11 can
be used to determine the required RMS current rating for the output capacitor.
VOUT ˜ ( VIN VOUT )
IC _ OUT (RMS)
12 ˜ VIN ˜ L OUT ˜ fSWITCH
(11)
Two other components need to be selected in the buck converter configuration. The value of the input-capacitor
(pin PWRx_VIN) should be equal or greater than halve the selected output capacitance COUT. In this case CIN 2
× 10 µF is sufficient. The capacitor between PWRx_SWITCH and PWRx_BOOST is a charge pump capacitor to
drive the high side FET. The recommended value is 100 nF.
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Since the switching edges of the buck converter are relatively fast, voltage overshoot and ringing can become a
problem. To overcome this problem a snubber network is used. The snubber circuit consists of a resistor and
capacitor that are connected in series from the switch node to ground. The snubber circuit is used to damp the
parasitic inductances and capacitances during the switching transitions. This circuit reduces the ringing voltage
and also reduces the number of ringing cycles. The snubber network is formed by RSNx and CSNx. More
information on controlling switch-node ringing in synchronous buck converters and configuring the snubber can
be found in Analog Applications Journal.
8.2.2.1 Component Selection for General-Purpose Buck Converters
The theory of operation of a buck converter is explained in application note, Understanding Buck Power Stages
in Switchmode Power Supplies, SLVA057. This section is limited to the component selection. For proper
operation, selection of the external components is very important, especially the inductor LOUT and the output
capacitor COUT. For best efficiency and ripple performance, an inductor and capacitor should be chosen with low
equivalent series resistance (ESR).
8.2.3 Application Curve
As the LED currents that are driven time-sequentially through the red, green, and blue LEDs are increased, the
brightness of the projector increases. This increase is somewhat non-linear, and the curve for typical white
screen lumens changes with LED currents as shown in Figure 25. For the LED currents shown, it’s assumed that
the same current amplitude is applied to the red, green, and blue LEDs. The thermal solution used to heatsink
the red, green, and blue LEDs can significantly alter the curve shape shown.
RELATIVE ILLUMINANCE LEVEL
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
1
2
3
4
5
6
7
8
LED CURRENT (A)
9
10
11
12
D001
Figure 25. Luminance vs LED Current
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8.3 System Example With DLPA3005 Internal Block Diagram
91 SUP_2P5V
LDO_V2V5
N/C 1
2.2µ/4V
92 SUP_5P0V
LDO_V5V
4.7µ/6.3V
THERMAL_PAD 42
1µ/16V
8 ILLUM_VIN
LDO
ILLUM
VINA 85
SYSPWR
7 ILLUM_5P5V
1µ/6.3V
VREF
0x0C
BAT_LOW_SHUT
1µ/16V
0x11
UVLO_SEL
VLED
29 ILLUM_A_FB
30 ILLUM_A_VIN
0x0C
BAT_LOW_WARN
SYSPWR
28 ILLUM_A_BOOST
0x10
LOWBATT_SEL
AGND
SYSPWR
26 ILLUM_HSIDE_DRIVE
100n
16V
86
AFE_GAIN [1:0]
31 ILLUM_A_SW
ILLUMINATION
DRIVER
A
AFE_SEL[3:0]
2x68µ
16V
LEXT
MEXT
27 ILLUM_LSIDE_DRIVE
1µH
20A
2x68µ
10V
Low_ESR
32 ILLUM_A_PGND
AFE
ACMPR_REF 82
From host
38 ILLUM_A_COMP1
ACMPR_OUT 81
To host
MUX
39 ILLUM_A_COMP2
35 ILLUM_B_FB
10p
NC
34 ILLUM_B_VIN
ACMPR_IN_LABB 80
ACMPR_LABB_SAMPLE 55
S/H
33 ILLUM_B_BOOST
V_LABB
NC
N
36 ILLUM_B_SW
ACMPR_IN_1 77
ACMPR_IN_2 78
From light sensor
From temperature sensor
ILLUMINATION
DRIVER
B
ACMPR_IN_3 79
NC
O
37 ILLUM_B_PGND
40 ILLUM_B_COMP1
DRST_5P5V 3
10µ/6.3V
SYSPWR
41 ILLUM_B_COMP2
LDO
DMD
DRST_VIN 5
NC
NC
PEXT
19 CH1_GATE_CTRL
1µ/16V
MBR0540T1
21 CH3_GATE_CTRL
A
DRST_HS_IND 6
PINT
DRST_LS_IND 2
1µ/50V
D
C
B
DMD
HIGH VOLTAGE
REGULATOR
DRST_PGND 4
DMD_VBIAS 99
DMD_VOFFSET 98
VBIAS
VOFS
NC
24,25 CH3_SWITCH
RGB
STROBE
DECODER
11,16 RLIM_1
22,23 RLIM_2
REXT
NC
17,18 CH2_SWITCH
RINT
DMD_VRESET 100
470n/50V
9,10 CH1_SWITCH
QINT
10µ/0.7A
VRST
QEXT
20 CH2_GATE_CTRL
NC
NC
NC
15 RLIM_K_1
14 RLIM_BOT_K_1
1µ/50V
G
13 RLIM_K_2
12.5m
2W
F
12 RLIM_BOT_K_2
E
PWR1_BOOST 97
100n
6.3V
SYSPWR
2x10µ
16V
69 PWR5_BOOST
PWR1_VIN 96
PWR1_SWITCH 95
I
3.3µH
3A
DMD/DLPC
PWR1
PWR1_PGND 93
General
Purpose
S
BUCK1
T
2x22µ
6.3V
Low_ESR
2x10µ
16V
3.3µH
3A
PWR2_PGND 73
K
DMD/DLPC
PWR2
General
Purpose
U
BUCK2
V
1µ/16V
PWR4_OUT 89
PWR3_OUT 87
50 PWR7_BOOST
LDO_1
DMD/DLPC/AUX
NC
CW_SPEED_PWM_OUT 44
CLK_OUT 43
W
BUCK3
X
SYSPWR
53 PWR7_SWITCH
RSN7 CSN7
2x10µ
16V
3.3µH
3A
54 PWR7_PGND
LDO_2
DMD/DLPC/AUX
51 PWR7_FB
83 PWR_VIN
Color Wheel
PWM
100n
6.3V
52 PWR7_VIN
General
Purpose
1µ/6.3V
NC
1-5V / 8bit
2x22µ
6.3V
Low_ESR
PWR3_VIN 88
1µ/16V
2x10µ
16V
66 PWR6_FB
1µ/6.3V
3.3V-20V
RSN6 CSN6
3.3µH
3A
62 PWR6_PGND
PWR4_VIN 90
3.3V-20V
SYSPWR
63 PWR6_SWITCH
PWR2_FB 72
2x22µ
6.3V
Low_ESR
100n
6.3V
64 PWR6_VIN
PWR2_SWITCH 74
V_DMD-DLPC-2
1-5V / 8bit
2x22µ
6.3V
Low_ESR
65 PWR6_BOOST
J
CSN2 RSN2
2x10µ
16V
71 PWR5_FB
PWR2_VIN 75
SYSPWR
RSN5 CSN5
3.3µH
3A
70 PWR5_PGND
PWR2_BOOST 76
100n
6.3V
SYSPWR
68 PWR5_SWITCH
PWR1_FB 94
V_DMD-DLPC-1
100n
6.3V
67 PWR5_VIN
H
CSN1 RSN1
LDO
BUCKS
1-5V / 8bit
2x22µ
6.3V
Low_ESR
1µ/16V
SYSPWR
84 PWR_5P5V
1µ/6.3V
57 RESET_Z
PROJ_ON 56
CH_SEL_0 60
CH_SEL_1 61
From host
From host
From host
To system
0.1µ/6.3V
From host
From host
From host
To host
From host
SPI_VIN
SPI_SS_Z
SPI_CLK
SPI_MISO
SPI_MOSI
46
47
49
SPI_VIN
DIGITAL
CORE
45
48
SPI
58 INT_Z
5.1k
To DLPC (optional)
Y
59 DGND
Figure 26. Typical Application: VIN = 12 V, IOUT = 16 A, LED, Internal FETs
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9 Power Supply Recommendations
The DLPA3005 is designed to operate from a 6 V to 20 V input voltage supply or battery. To avoid insufficient
supply current due to line drop, ringing due to trace inductance at the VIN terminals, or supply peak current
limitations, additional bulk capacitance may be required. In the case ringing that is caused by the interaction with
the ceramic input capacitors, an electrolytic or tantalum type capacitor may be needed for damping.
The amount of bulk capacitance required should be evaluated such that the input voltage can remain in spec
long enough for a proper fast shutdown to occur for the VOFFSET, VRESET, and VBIAS supplies. The shutdown
begins when the input voltage drops below the programmable UVLO threshold such as when the external power
supply or battery supply is suddenly removed from the system.
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9.1 Power-Up and Power-Down Timing
The power-up and power-down sequence is important to ensure a correct operation of the DLPA3005 and to
prevent damage to the DMD. The DLPA3005 controls the correct sequencing of the DMD_VRESET,
DMD_VBIAS, and DMD_VOFFSET to ensure a reliable operation of the DMD.
The general startup sequence of the supplies is described earlier in Supply and Monitoring. The power-up
sequence of the high voltage DMD lines is especially important in order not to damage the DMD. A too large
delta voltage between DMD_VBIAS and DMD_VOFFSET could cause the damage and should therefore be
prevented.
After PROJ_ON is pulled high, the DMD buck converters and LDOs are powered (PWR1-4) the DMD high
voltage lines (HV) are sequentially enabled. First DMD_VOFFSET is enabled. After a delay
VOFS_STATE_DURATION (register 0x10) DMD_VBIAS is enabled. Finally, again after a delay
VBIAS_STATE_DURATION (register 0x11) DMD_VRESET is enabled. Now the DLPA3005 is fully powered and
ready for starting projection.
For power down there are two sequences, normal power down (Figure 27) and a fault fast power down used in
case a fault occurs (Figure 28).
In normal power down mode, the power down is initiated after pulling PROJ_ON pin low. 25 ms after PROJ_ON
is pulled low, first DMD_VBIAS and DMD_VRESET stop regulating, 10 ms later followed by DMD_OFFSET.
When DMD_OFFSET stopped regulating, RESET_Z is pulled low. 1 ms after the DMD_OFFSET stopped
regulating, all three voltages are discharged. Finally, all other supplies are turned off. INT_Z remains high during
the power down sequence since no fault occurred. During power down it is ensured that the HV levels do not
violate the DMD specifications on these three lines. For this it is important to select the capacitors such that
CVOFFSET is equal to CVRESET and CVBIAS is ≤ CVOFFSET, CVBIAS.
The fast power down mode (Figure 28) is started in case a fault occurs (INT_Z will be pulled low), for instance
due to overheating. The fast power down mode can be enabled/ disabled via register 0x01,
FAST_SHUTDOWN_EN. By default the mode is enabled. After the fault occurs, regulation of DMD_VBIAS and
DMD_VRESET is stopped. The time (delay) between fault and stop of regulation can be controlled via register
0x0F (VBIAS/VRST_DELAY). The delay can be selected between 4 µs and ~1.1 ms, where the default is ~540
µs. A defined delay-time after the regulation stopped, all three high voltages lines are discharged and RESET_Z
is pulled low. The delay can be controlled via register 0x0F (VOFS/VRESETZ_DELAY). Delay can be selected
between 4 µs and ~1.1ms. The default is ~4 µs. Finally the internal DMD_EN signal is pulled low.
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Power-Up and Power-Down Timing (continued)
Now the DLPA3005 is in a standby state. It remains in standby state until the fault resolves. In case the fault
resolves a restart is initiated. It starts then by powering-up PWR_3 and follows the regular power up as depicted
in Figure 28. Again, for proper discharge timing/levels the capacitors should be select such that CVOFFSET is equal
to CVRESET and CVBIAS is ≤ CVOFFSET, CVBIAS.
SYSPWR
Initiated by DLPC
Initiated by DLPC
PROJ_ON
SUP_5P0V
SUP_2P5V
D_CORE_EN
(INTERNAL SIGNAL)
PWR_5P5V
DRST_5P5V
ILLUM_5P5V
PWR_1
PWR_2
PWR_3
PWR_4
PWR_5
PWR_6
PWR_7
INT_Z
RESET_Z
Initiated by
DLPC via SPI
DMD_EN
(INTERNAL SIGNAL)
Stop
Regulating
DMD_VOFFSET
Stop
Regulating
DMD_VBIAS
DMD_VRESET
Analog start
Note:
>1ms
Load EEPROM
Start digital supply
Wakeup
>5ms
Start main supply
Stop
Regulating
>10ms
>10ms
>10ms
>10ms
VOFS
VBIAS
STATE
STATE
DURATION DURATION
0x10[7:5]
0x11[7:5]
Digital state machine control only
25ms
10ms
1ms
10ms
120µs
Digital state machine & SPI control
Arrows indicate sequence of events automatically controlled by digital state machine. Other events are initiated under
SPI control.
Figure 27. Power Sequence Normal Shutdown Mode
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Power-Up and Power-Down Timing (continued)
SYSPWR
Initiated by DLPC
PROJ_ON
SUP_5P0V
SUP_2P5V
PWR_5P5V
DRST_5P5V
ILLUM_5P5V
PWR_1
Supplies are not turned off,
Unless PROJ_ON is set Low
PWR_2
PWR_3
PWR_4
PWR_5
PWR_6
PWR_7
Initiated by
FAULT
INT_Z
RESET_Z
Initiated by
DLPC via SPI
DMD_EN
(INTERNAL SIGNAL)
DMD_VOFFSET
DMD_VBIAS
>10ms
>10ms
Digital state machine control only
Digital state machine & SPI control
In case fault resolves
VOFS
Delay
0x0F
[7:4]
VBIAS
Delay
0x0F
[3:0]
VOFS
VBIAS
STATE
STATE
DURATION DURATION
0x10[7:5]
0x11[7:5]
VOFS
Delay
0x0F
[7:4]
VOFS
Delay
0x0F
[7:4]
120µs
Discharge
>10ms
Stop Regulation
>1ms
>10ms
Fault Occurs
Analog start
Load EEPROM
Start digital supply
Wakeup
>5ms
Start main supply
DMD_VRESET
(INT_Z remains low until cleared)
Note:
Arrows indicate sequence of events automatically controlled by digital state machine. Other events are initiated under
SPI control.
Figure 28. Power Sequence Fault Fast Shutdown Mode
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10 Layout
10.1 Layout Guidelines
For switching power supplies, the layout is an important step in the design, especially when it concerns high
peak currents and high switching frequencies. If the layout is not carefully done, the regulator could show stability
issues and/or EMI problems. Therefore, it is recommended to use wide and short traces for high current paths
and for their return power ground paths. For the DMD HV regulator, the input capacitor, output capacitor, and the
inductor should be placed as close as possible to the IC. In order to minimize ground noise coupling between
different buck converters it is advised to separate their grounds and connect them together at a central point
under the part. For the DMD HV regulator, the recommended value for the capacitors is 1 µF for VRST and
VOFS, 470 nF for VBIAS. The inductor value is 10 µH.
The high currents of the buck converters concentrate around pins VIN, SWITCH and PGND (Figure 29). The
voltage at the pins VIN, PGND and FB are DC voltages while the pin SWITCH has a switching voltage between
VIN and PGND. In case the FET between pins 52 – 53 is closed the red line indicates the current flow while the
blue line indicates the current flow when the FET between pins 53 – 54 is closed.
These paths carry the highest currents and must be kept as short as possible.
For the LDO DMD, it is recommended to use a 1 µF/16 V capacitor on the input and a 10 µF/6.3 V capacitor on
the output of the LDO assuming a battery voltage of 12 V.
For LDO bucks, it is recommended to use a 1 µF/16 V capacitor on the input and a 1 µF/6.3 V capacitor on the
output of the LDO.
50 PWR7_BOOST
52 PWR7_VIN
General
Purpose
53 PWR7_SWITCH
BUCK3
100n
6.3V
SYSPWR
2x10µ
16V
RSN7 CSN7
3.3µH
3A
51 PWR7_FB
Regulated Output
Voltage
2x22µ
6.3V
Low_ESR
54 PWR7_PGND
Figure 29. High AC Current Paths in a Buck Converter
The trace to the VIN pin carries high AC currents. Therefore the trace should be low resistive to prevent voltage
drop across the trace. Additionally the decoupling capacitors should be placed as close to the VIN pin as
possible.
The SWITCH pin is connected alternatingly to the VIN or GND. This means a square wave voltage is present on
the SWITCH pin with an amplitude of VIN, and containing high frequencies. This can lead to EMI problems if not
properly handled. To reduce EMI problems a snubber network (RSN7 & CSN7) is placed at the SWITCH pin to
prevent and/or suppress unwanted high frequency ringing at the moment of switching.
The PGND pin sinks high current and should be connected to a star ground point such that it does not interfere
with other ground connections.
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Layout Guidelines (continued)
The FB pin is the sense connection for the regulated output voltage which is a DC voltage; no current is flowing
through this pin. The voltage on the FB pin is compared with the internal reference voltage in order to control the
loop. The FB connection should be made at the load such that I•R drop is not affecting the sensed voltage.
10.1.1 SPI Connections
The SPI interface consists of several digital lines and the SPI supply. If routing of the interface lines is not done
properly, communication errors can occur. It should be prevented that SPI lines can pickup noise and possible
interfering sources should be kept away from the interface.
Pickup of noise can be prevented by ensuring that the SPI ground line is routed together with the digital lines as
much as possible to the respective pins. The SPI interface should be connected by a separate own ground
connection to the DGND of the DLPA3005 (Figure 30). This prevents ground noise between SPI ground
references of DLPA3005 and DLPC due to the high current in the system.
CLK
MISO
MOSI
SS_Z
DLPC
SPI
Interface SPI_GND
DLPA3005
GND
VIN
-
VGND-DROP +
I
DGND
DLPA3005 PCB
Figure 30. SPI Connections
Interfering sources should be kept away from the interface lines as much as possible. Especially high current
lines such as neighboring PWR_7 should be routed carefully. If PWR 7 is routed too close to for instance the
SPI_CLK it could lead to false clock pulses and thus communication errors.
10.1.2 RLIM Routing
RLIM is used to sense the LED current. To accurately measure the LED current, the RLIM _K_1,2 lines should
be connected close to the top-side of measurement resistor RLIM, while RLIM_BOT_K_1,2 should be connected
close to the bottom-side of RLIM.
The switched LED current is running through RLIM. Therefore a low-ohmic ground connection for RLIM is
strongly advised.
10.1.3 LED Connection
Through the wiring from the external RGB switches to the LEDs switched large currents are running. Therefore
special attention needs to be paid here. Two perspectives apply to the LED-to-RGB switches wiring:
1. The resistance of the wiring, Rseries
2. The inductance of the wiring, Lseries
The location of the parasitic series impedances are depicted in Figure 31.
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Layout Guidelines (continued)
VLED
RSERIES
CDECOUPLE
LSERIES
SW
VRLIM
Close to
VLED, RLIM
RLIM
Figure 31. Parasitic Inductance (LSeries) and Resistance (Rseries) in Series with LED
Currents up to 16 A can run through the wires connecting the LEDs to the RGB switches. Easily some noticeable
dissipation can be caused. Every 10 mΩ of series resistances implies for 16 A average LED current a parasitic
power dissipation of 2.5 W. This might cause PCB heating, but more important overall system efficiency is
deteriorated.
Additionally the resistance of the wiring might impact the control dynamics of the LED current. It should be noted
that the routing resistance is part of the LED current control loop. The LED current is controlled by VLED. For a
small change in VLED (ΔVLED) the resulting LED current variation (ΔILED) is given by the total differential
resistance in that path, as:
' ILED
rLED
R series
' VLED
R on _ SW
_ Q 3 ,Q 4 ,Q 5
R LIM
where
•
•
rLED is the differential resistance of the LED
Ron_SW_P,Q,R the on resistance of the strobe decoder switch.
(12)
In this expression Lseries is ignored since realistic values are usually sufficiently low to cause any noticeable
impact on the dynamics.
All the comprising differential resistances are in the range of 12.5 mΩ to several 100’s mΩ. Without paying
special attention a series resistance of 100 mΩ can easily be obtained. It is advised to keep this series
resistance sufficiently low, i.e.
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