AS3693E
austriamicrosystems
Product Specification, Confidential
AS3693E–16 Channel high precision LED driver for
LCD Backlight
1 General Description
The AS3693E is a 16 channels high precision LED
controller with build in PWM generators for driving
external FETs in LCD-backlight panels.
The output current can be controlled either by an
external PWM signal or by 16 build in PWM
generators with programmable delay, period and
duty cycle. Three free configurable dynamic power
feedback circuits make the device usable for white
LED as well as RGB backlights. Build in safety
features include thermal shutdown as well as open
and short LED detection. All circuit parameters are
programmable via I2C or SPI interface.
2 Key Features
16 Channel LED driver
Output current only limited by external
transistor
Output voltage 0.4V to 50V
Absolute current accuracy +/- 0.5%
Output slew rate programmable
Current programmable with external resistor
Linear current control with 8 - bit DAC
Linear current control with external analog
voltage
Digital current control with external PWM signal
Digital current control with 16 independent
PWM generators
Free programmable 12 bit resolution ( period,
high time and delay )
Overvoltage detection ( short LED )
Undervoltage detection ( open LED )
Temperature shutdown
Fault interrupt output
I2C interface
SPI interface
5 bit device - address (sets device address
and interface mode)
Automatic supply regulation feedback
Each output can be assigned to red, green or
blue feedback.
Package epTQFP64 and QFN64
3 Applications
•
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LED backlighting for LCD – TV sets and
monitors
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AS3693E
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4 Block Diagram
V2_5
REF
Vreg
FBB
FBG
FBR
Vsupply
PWM
Reference,
DAC
PWM
PWM
Fault detectors
PWM
SMPS
feedback
PWM
PWM
PWM
PWM
AS3693E
PWM
PWM
PWM
PWM
PWM
SDA
SCL
CS
SDO
Vsync
Hsync
SPI / I2C
Interface
PWM
PWM
Addr2
Addr1
Fault
86 byte
registers
PWM
V2_5
PWM
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AS3693E
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Table of Contents
1
2
3
4
5
General Description ....................................................................................................................................... 1
Key Features.................................................................................................................................................. 1
Applications.................................................................................................................................................... 1
Block Diagram................................................................................................................................................ 2
Characteristics ............................................................................................................................................... 4
5.1
Absolute Maximum Ratings .................................................................................................................... 4
5.2
Operating Conditions .............................................................................................................................. 5
5.3
Electrical Characteristics......................................................................................................................... 5
6 Typical Operation Characteristics .................................................................................................................. 7
6.1
Output current vs Output Voltage ........................................................................................................... 7
6.2
Vsupply vs VREG and V2.5 at startup .................................................................................................... 7
6.3
9us Slew Rate......................................................................................................................................... 8
6.4
Supply Regulation ................................................................................................................................... 8
7 Block Description ........................................................................................................................................... 9
7.1
Feedback Circuit ..................................................................................................................................... 9
7.1.1
Feedback Selection ....................................................................................................................... 10
7.1.2
Voltage fault registers .................................................................................................................... 11
7.2
Curreg 1-16........................................................................................................................................... 11
7.3
PWM – modes ...................................................................................................................................... 13
7.3.1
PWM mode (PWM_MODE = 00) ................................................................................................... 13
7.3.2
ASYNC – mode (PWM_MODE = 01) ............................................................................................ 13
7.4
PWM – high time, period and delay registers ....................................................................................... 15
7.5
Shunt Regulator .................................................................................................................................... 16
7.5.1
Undervoltage lockout ..................................................................................................................... 16
7.6
Over temperature control ...................................................................................................................... 16
Device address setup ...................................................................................................................................... 17
7.6.1
I2C Device Address setup ............................................................................................................. 17
7.6.2
SPI Device Address setup ............................................................................................................. 17
7.7
Digital interface ..................................................................................................................................... 18
7.7.1
I2C interface .................................................................................................................................. 18
7.7.2
SPI interface .................................................................................................................................. 20
8 Register map................................................................................................................................................ 22
9 Pinout and Packaging .................................................................................................................................. 25
9.1
Pinout.................................................................................................................................................... 25
9.2
Package drawing epTQFP64 ................................................................................................................ 27
9.3
Package drawing QFN64 ..................................................................................................................... 29
10 Ordering Information .................................................................................................................................... 32
Copyright ............................................................................................................................................................. 33
Disclaimer ........................................................................................................................................................... 33
Contact Information ............................................................................................................................................. 33
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AS3693E
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5 Characteristics
5.1 Absolute Maximum Ratings
Stresses beyond those listed in Table 1 may cause permanent damage to the device. These are stress ratings
only and functional operation of the device at these or any other conditions beyond those indicated in Section 5
Electrical Characteristics is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Table 1 – Absolute Maximum Ratings
Symbol
Parameter
Min
Max
Unit
VDDMAX
Supply for LED’s
-0.3
>50
V
See notes
VINVREG
VREG supply voltage
-0.3
7.0
V
Applicable for pin VREG
IINVREG
Maximum Vreg current
100
mA
VIN2.5V
2.5 V Pins
-0.3
V2_5+0.3V
V
Applicable for 2.5V pins
VIN5V
5V Pins
-0.3
VREG+
0.3V
V
Applicable for 5V pins2
VIN50V
50V Pins
-0.3
55
V
Applicable for CURR1, CURR2,
CURR3 up to CURR16
IIN
Input Pin Current
-25
+25
mA At 25ºC, Norm: Jedec 17
TSTRG
Storage Temperature Range
-55
150
°C
Humidity
5
85
%
Non condensing
-4000
4000
V
Norm: MIL 883 E Method 3015
-2000
2000
V
Norm: MIL 883 E Method 3015
W
At Ta = 25ºC, no airflow for
ePTQFP64 on two layer FR4-Cu
3
PCB
VESD
Electrostatic Discharge on Pins
Curr1 – Curr16
VESD
Electrostatic Discharge on all Pins
PT
Total Power Dissipation
3.8W
PDERATE
PT Derating Factor
40
TBODY
Body Temperature during
Soldering
260
Note
1
Maximum Current flowing into
Vreg
4
mW/
3
See notes
°C
°C
according to IPC/JEDEC J-STD020C
Notes:
1, As the AS3693E is not directly connected to this supply. Only the parameters VINVREG, VIN5V and
VIN50V have to be guaranteed by the application
2, All pins except CURR1 to CURR16 and 2.5V
3, Copper area > 9 cm², thermal vias
4, 2.5V Pins are Fault, SDO, ADDR1 and ADDR2
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AS3693E
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5.2 Operating Conditions
Table 2 – Operating Conditions
Symbol
Parameter
VDD
Main Supply
VDDTOL Main Supply Voltage Tolerance
VREGINT
Supply (shunt regulated by
AS3693E)
VREGEXT
VUVL
Untervoltage lockout voltage
Min
Typ
-20
Max
Unit
Note
Not
Limited
V
Supply is not directly connected to
the AS3693E – see section ‘Shunt
Regulator’
+20
%
Applies only for supply VREG is
connected via Rvdd
5.0
5.2
5.4
V
If internally (shunt-)regulated by
ZD1
3
4.5
4.9
V
If externally supplied
2.4
2.7
3
V
If Vreg < UVUL current sources
are turned off
( Addr 0x01,Addr 0x02 = 0x00 )
IVREG
Supply Current (Chip current
consumption)
20
Excluding current through shunt
regulator (ZD1) – see section
mA ‘Shunt Regulator’. Note: Take care
of the Power dissipation of the
external Resistor.
IVREG_M
Maximum Supply current
30
Maximum Current Into VREG –
mA PIN (Supply current + shunt
regulator current).
350
uA
Max
Unit
50.0
V
+0.5
%
AX
Condition: externally supplied
IVREG
EXT_OFF
Curr_reg1-16 off (register 01h =
00h, register 02h = 00h)
5.3 Electrical Characteristics
Table 3 – Analog Electrical Characteristics
Symbol
Parameter
VCURR
Voltage at CURR1 to CURR16
Min
Typ
Note
Using 250mV reference
-0.5
@25C TJUNCTION, excluding
variation of external resistors
Using 250mV reference
(1)
ICURR,
TOL
Current Source Tolerance
-1.5
+1.5
%
-20°C to +100°C TJUNCTION,
-20°C to +85°C TAMB, excluding
variation of external resistors;
V(CURRx)
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