TLC5928
SBVS120E – JULY 2008 – REVISED JANUARY 2011
www.ti.com
16-Channel, Constant-Current LED Driver with LED Open Detection
Check for Samples: TLC5928
FEATURES
APPLICATIONS
•
•
•
•
1
23
•
•
•
•
•
•
•
•
•
•
•
16 Channels, Constant-Current Sink Output
with On/Off Control
35-mA Capability (Constant-Current Sink)
10-ns High-Speed Constant-Current Switching
Transient Time
Low On-Time Error
LED Power-Supply Voltage up to 17 V
VCC = 3.0 V to 5.5 V
Constant-Current Accuracy:
– Channel-to-Channel = ±1%
– Device-to-Device = ±1%
CMOS Logic Level I/O
35-MHz Data Transfer Rate
20-ns BLANK Pulse Width
Readable Error Information:
– LED Open Detection (LOD)
– Pre-Thermal Warning (PTW)
Operating Temperature: –40°C to +85°C
VLED
Controller
The TLC5928 is a 16-channel, constant-current sink
LED driver. Each channel can be turned on/off by
writing serial data to an internal register. The
constant-current value of all 16 channels is set by a
single external resistor.
The TLC5928 has two error detection circuits: one for
LED open detection (LOD) and one for a pre-thermal
warning (PTW). LOD detects a broken or
disconnected LED and LEDs shorted to GND while
the constant-current output is on. PTW indicates a
high temperature condition.
¼
¼
¼
¼
¼
OUT15
OUT0
SOUT
IREF
OUT15
SOUT
VCC
SCLK
LAT
VCC
VCC
BLANK
BLANK
ERROR
READ
¼
SIN
VCC
LAT
BLANK
VLED
¼
SCLK
LAT
VLED
¼
SIN
SCLK
DESCRIPTION
VLED
OUT0
DATA
LED Video Displays
Message Boards
Illumination
TLC5928
IC1
RIREF
IREF
GND
TLC5928
ICn
GND
RIREF
3
Typical Application Circuit (Multiple Daisy-Chained TLC5928s)
1
2
3
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments, Inc.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
© 2008–2011, Texas Instruments Incorporated
TLC5928
SBVS120E – JULY 2008 – REVISED JANUARY 2011
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
PACKAGE/ORDERING INFORMATION (1)
PRODUCT
PACKAGE-LEAD
TLC5928
SSOP-24/QSOP-24
TLC5928
TSSOP-24
TLC5928
TRANSPORT MEDIA, QUANTITY
TLC5928DBQR
Tape and Reel, 2500
TLC5928DBQ
Tube, 50
TLC5928PWR
Tape and Reel, 2000
HTSSOP-24 PowerPAD™
TLC5928
(1)
ORDERING NUMBER
QFN-24
TLC5928PW
Tube, 60
TLC5928PWPR
Tape and Reel, 2000
TLC5928PWP
Tube, 60
TLC5928RGER
Tape and Reel, 3000
TLC5928RGE
Tape and Reel, 250
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or visit the
device product folder at www.ti.com.
ABSOLUTE MAXIMUM RATINGS (1) (2)
Over operating free-air temperature range, unless otherwise noted.
PARAMETER
TLC5928
–0.3 to +6.0
V
40
mA
SIN, SCLK, LAT, BLANK, IREF
–0.3 to VCC + 0.3
V
SOUT
–0.3 to VCC + 0.3
V
VCC
Supply voltage: VCC
IOUT
Output current (dc)
OUT0 to OUT15
VIN
Input voltage range
VOUT
Output voltage range
TJ(MAX)
Operating junction temperature
TSTG
Storage temperature range
OUT0 to OUT15
Human body model (HBM)
ESD rating
(1)
(2)
UNIT
Charged device model (CDM)
–0.3 to +18
V
+150
°C
–55 to +150
°C
2
kV
500
V
Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may
degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those specified is not supported.
All voltage values are with respect to network ground terminal.
DISSIPATION RATINGS
(1)
(2)
2
PACKAGE
OPERATING FACTOR
ABOVE TA = +25°C
TA < +25°C
POWER RATING
TA = +70°C
POWER RATING
TA = +85°C
POWER RATING
SSOP-24/QSOP-24
14.3 mW/°C
1782 mW
1140 mW
927 mW
TSSOP-24
9.6 mW/°C
1194 mW
764 mW
621 mW
HTSSOP-24 (1)
28.9 mW/°C
3611 mW
2311 mW
1878 mW
QFN-24 (2)
24.8 mW/°C
3106 mW
1988 mW
1615 mW
With PowerPAD soldered onto copper area on printed circuit board (PCB); 2 oz. copper. For more information, see SLMA002 (available
for download at www.ti.com).
The package thermal impedance is calculated in accordance with JESD51-5.
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Product Folder Link(s): TLC5928
TLC5928
SBVS120E – JULY 2008 – REVISED JANUARY 2011
www.ti.com
RECOMMENDED OPERATING CONDITIONS
At TA= –40°C to +85°C, unless otherwise noted.
TLC5928
PARAMETER
TEST CONDITIONS
MIN
NOM
MAX
UNIT
DC Characteristics: VCC = 3 V to 5.5 V
VCC
Supply voltage
VO
Voltage applied to output
VIH
High-level input voltage
VIL
Low-level input voltage
IOH
High-level output current
IOL
Low-level output current
IOLC
Constant output sink current
TA
TJ
3.0
5.5
V
17
V
0.7 × VCC
VCC
V
GND
0.3 × VCC
OUT0 to OUT15
SOUT
SOUT
V
–1
mA
1
mA
2
35
mA
Operating free-air temperature range
–40
+85
°C
Operating junction temperature range
–40
+125
°C
OUT0 to OUT15
AC Characteristics: VCC = 3 V to 5.5 V
fCLK
(SCLK)
Data shift clock frequency
TWH0
SCLK
35
MHz
SCLK
10
ns
SCLK
10
ns
LAT
20
ns
BLANK
20
ns
TWL2
BLANK
20
ns
TSU0
SIN–SCLK↑
4
ns
100
ns
SIN–SCLK↑
3
ns
LAT↑–SCLK↑
10
ns
TWL0
TWH1
Pulse duration
TWH2
TSU1
TH0
TH1
Setup time
Hold time
LAT↑–SCLK↑
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3
TLC5928
SBVS120E – JULY 2008 – REVISED JANUARY 2011
www.ti.com
ELECTRICAL CHARACTERISTICS
At VCC = 3.0 V to 5.5 V and TA = –40°C to +85°C. Typical values at VCC = 3.3 V and TA = +25°C, unless otherwise noted.
TLC5928
PARAMETER
TEST CONDITIONS
VOH
High-level output voltage
IOH = –1 mA at SOUT
VOL
Low-level output voltage
IOL = 1 mA at SOUT
IIN
Input current
VIN = VCC or GND at SIN, SCLK, LAT, and BLANK
MIN
MAX
UNIT
VCC – 0.4
TYP
VCC
V
0
0.4
V
–1
1
mA
ICC1
SIN/SCLK/LAT = low, BLANK = high, VOUTn = 1 V,
RIREF = 27 kΩ
1
2
mA
ICC2
SIN/SCLK/LAT = low, BLANK = high, VOUTn = 1 V,
RIREF = 3 kΩ
4.5
8
mA
Supply current (VCC)
ICC3
SIN/SCLK/LAT/BLANK = low, VOUTn = 1 V,
RIREF = 3 kΩ
7
18
mA
ICC4
SIN/SCLK/LAT/BLANK = low, VOUTn = 1 V,
RIREF = 1.5 kΩ
16
40
mA
34
37
mA
0.1
mA
IOLC
Constant output current
All OUTn = ON, VOUTn = VOUTfix = 1 V, RIREF = 1.5 kΩ
(see Figure 6), at OUT0 to OUT15
IOLKG
Output leakage current
All OUTn for constant-current driver, all outputs off
BLANK = high, VOUTn = VOUTfix = 17 V, RIREF = 1.5 kΩ
(see Figure 6), at OUT0 to OUT15
ΔIOLC
Constant-current error
(channel-to-channel) (1)
All OUTn = ON, VOUTn = VOUTfix = 1 V, RIREF = 1.5 kΩ
at OUT0 to OUT15
±1
±3
%
ΔIOLC1
Constant-current error
(device-to-device) (2)
All OUTn = ON, VOUTn = VOUTfix = 1 V, RIREF = 1.5 kΩ
at OUT0 to OUT15
±1
±6
%
ΔIOLC2
Line regulation (3)
All OUTn = ON, VOUTn = VOUTfix = 1 V, RIREF = 1.5 kΩ
at OUT0 to OUT15
±0.5
±1
%/V
ΔIOLC3
Load regulation (4)
All OUTn = ON, VOUTn = 1 V to 3V, VOUTfix = 1 V,
RIREF = 1.5 kΩ, at OUT0 to OUT15
±1
±3
%/V
(5)
31
T(PTW)
Pre-thermal warning threshold
Junction temperature
+125
+138
+150
°C
VLOD
LED open detection threshold
All OUTn = ON
0.25
0.30
0.35
V
VIREF
Reference voltage output
RIREF = 1.5 kΩ
1.16
1.20
1.24
V
(1)
The deviation of each output from the average of OUT0–OUT15 constant-current. Deviation is calculated by the formula:
IOUTn
D (%) =
-1
´ 100
(IOUT0 + IOUT1 + ... + IOUT14 + IOUT15)
(2)
16
.
The deviation of the OUT0–OUT15 constant-current average from the ideal constant-current value.
Deviation is calculated by the following formula:
(IOUT0 + IOUT1 + ... IOUT14 + IOUT15)
- (Ideal Output Current)
16
D (%) =
´ 100
Ideal Output Current
Ideal current is calculated by the formula:
IOUT(IDEAL) = 42 ´
(3)
1.20
RIREF
Line regulation is calculated by this equation:
D (%/V) =
(IOUTn at VCC = 5.5 V) - (IOUTn at VCC = 3.0 V)
(4)
(IOUTn at VOUTn = 3 V) - (IOUTn at VOUTn = 1 V)
100
´
(IOUTn at VOUTn = 1 V)
4
5.5 V - 3 V
Load regulation is calculated by the equation:
D (%/V) =
(5)
100
´
(IOUTn at VCC = 3.0 V)
3V-1V
Not tested. Specified by design.
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Product Folder Link(s): TLC5928
TLC5928
SBVS120E – JULY 2008 – REVISED JANUARY 2011
www.ti.com
SWITCHING CHARACTERISTICS
At VCC = 3.0 V to 5.5 V, TA = –40°C to +85°C, CL = 15 pF, RL = 130 Ω, RIREF = 1.5 kΩ, and VLED = 5.5 V. Typical values at
VCC = 3.3 V and TA = +25°C, unless otherwise noted.
TLC5928
PARAMETER
tR0
TEST CONDITIONS
Rise time
tR1
tF0
Fall time
tF1
MIN
TYP
MAX
UNIT
SOUT (see Figure 5)
5
15
ns
OUTn (see Figure 4)
10
30
ns
SOUT (see Figure 5)
5
15
ns
OUTn (see Figure 4)
10
30
ns
tD0
SCLK↑ to SOUT
8
20
ns
tD1
LAT↑ or BLANK↓ to OUTn sink current on
(see Figure 10)
12
30
ns
LAT↑ or BLANK↑ to OUTn sink current off
(see Figure 10)
12
30
ns
+8
ns
Propagation delay time
tD2
tON_ERR
(1)
Output on-time error (1)
On/off latch data = all '1', 20 ns BLANK low level
one-shot pulse input (see Figure 4)
–8
Output on-time error (tON_ERR) is calculated by the formula: tON_ERR (ns) = tOUT_ON – BLANK low level one-shot pulse width (TWL2).
tOUT_ON indicates the actual on-time of the constant-current driver.
FUNCTIONAL BLOCK DIAGRAM
VCC
VCC
SIN
LSB
MSB
On/Off Control Shift Register
(1 Bit x 16 Channels)
SCLK
0
SOUT
15
16
MSB
LSB
LAT
16
On/Off Control Data Latch
(1 Bit x 16 Channels)
0
BLANK
15
16
SID Latch
16-Channel Constant Current Sink Driver
IREF
16
Thermal
Detection
GND
16-Channel LED Open Detection
GND
¼
OUT0
OUT1
OUT14 OUT15
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5
TLC5928
SBVS120E – JULY 2008 – REVISED JANUARY 2011
www.ti.com
DEVICE INFORMATION
SSOP-24/QSOP-24 AND TSSOP-24
DBQ AND PW PACKAGES
(TOP VIEW)
HTSSOP-24 PowerPAD
PWP PACKAGE
(TOP VIEW)
GND
1
24
VCC
GND
1
24
VCC
SIN
2
23
IREF
SIN
2
23
IREF
SCLK
3
22
SOUT
SCLK
3
22
SOUT
LAT
4
21
BLANK
LAT
4
21
BLANK
OUT0
5
20
OUT15
OUT0
5
20
OUT15
OUT1
6
19
OUT14
OUT1
6
19
OUT14
18
OUT13
TLC5928
Thermal Pad
(Bottom Side)
TLC5928
OUT2
7
18
OUT13
OUT2
7
OUT3
8
17
OUT12
OUT3
8
17
OUT12
OUT4
9
16
OUT11
OUT4
9
16
OUT11
OUT5
10
15
OUT10
OUT5
10
15
OUT10
OUT6
11
14
OUT9
OUT6
11
14
OUT9
OUT7
12
13
OUT8
OUT7
12
13
OUT8
SCLK
SIN
GND
VCC
IREF
SOUT
24
23
22
21
20
19
QFN-24
RGE PACKAGE
(TOP VIEW)
LAT
1
18
BLANK
OUT0
2
17
OUT15
OUT1
3
16
OUT14
OUT2
4
15
OUT13
OUT3
5
14
OUT12
OUT4
6
13
OUT11
7
8
9
10
11
12
OUT5
OUT6
OUT7
OUT8
OUT9
OUT10
Thermal Pad
(Bottom Side)
TLC5928
NOTE: Thermal pad is not connected to GND internally. The thermal pad must be connected to GND via the PCB pattern.
6
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TLC5928
SBVS120E – JULY 2008 – REVISED JANUARY 2011
www.ti.com
TERMINAL FUNCTIONS
TERMINAL
NAME
DBQ/PW/
PWP
RGE
I/O
DESCRIPTION
SIN
2
23
I
Serial data input for driver on/off control. When SIN = high level, data '1' are written into LSB
of the on/off control shift register at the rising edge of SCLK.
SCLK
3
24
I
Serial data shift clock. Schmitt buffer input. All data in the on/off control shift register are
shifted toward the MSB by 1-bit synchronization of SCLK. A rising edge on SCLK is allowed
100 ns after a rising edge of LAT.
LAT
4
1
I
Edge triggered latch. The data in the on/off control data shift register are transferred to the
on/off control data latch at this rising edge. At the same time, the data in the on/off control shift
register are replaced with LED open detection (LOD) and pre-thermal warning (PTW) data.
LAT must be toggled only once after the shift data are updated to avoid the on/off control latch
data being replaced with LOD and PTW data in the shift register.
BLANK
21
18
I
Blank, all outputs. When BLANK = high level, all constant-current outputs (OUT0–OUT15) are
forced off. When BLANK = low level, all constant-current outputs are controlled by the on/off
control data in the data latch. LOD and PTW data are latched into the SID data latch at the
rising edge of BLANK and are present at the output of the SID data latch when BLANK is low.
IREF
23
20
I/O
Constant-current value setting, OUT0–OUT15 sink constant-current is set to desired value by
connection to an external resistor between IREF and GND.
SOUT
22
19
O
Serial data output. This output is connected to the MSB of the on/off data shift register. SOUT
data changes at the rising edge of SCLK.
OUT0
5
2
O
Constant-current output. Each output can be tied together with others to increase the
constant-current. Different voltages can be applied to each output.
OUT1
6
3
O
Constant-current output
OUT2
7
4
O
Constant-current output
OUT3
8
5
O
Constant-current output
OUT4
9
6
O
Constant-current output
OUT5
10
7
O
Constant-current output
OUT6
11
8
O
Constant-current output
OUT7
12
9
O
Constant-current output
OUT8
13
10
O
Constant-current output
OUT9
14
11
O
Constant-current output
OUT10
15
12
O
Constant-current output
OUT11
16
13
O
Constant-current output
OUT12
17
14
O
Constant-current output
OUT13
18
15
O
Constant-current output
OUT14
19
16
O
Constant-current output
OUT15
20
17
O
Constant-current output
VCC
24
21
—
Power-supply voltage
GND
1
22
—
Power ground
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TLC5928
SBVS120E – JULY 2008 – REVISED JANUARY 2011
www.ti.com
PARAMETER MEASUREMENT INFORMATION
PIN EQUIVALENT INPUT AND OUTPUT SCHEMATIC DIAGRAMS
VCC
VCC
INPUT
SOUT
GND
GND
Figure 1. SIN, SCLK, LAT, BLANK
Figure 2. SOUT
OUTn
GND
Figure 3. OUT0 Through OUT15
TEST CIRCUITS
RL
VCC
VCC
VCC
OUTn
IREF
VLED
(1)
RIREF
GND
CL
SOUT
VCC
CL
GND
(1)
(1) CL includes measurement probe and jig capacitance.
Figure 4. Rise Time and Fall Time Test Circuit for
OUTn
(1) CL includes measurement probe and jig capacitance.
Figure 5. Rise Time and Fall Time Test Circuit for
SOUT
VCC
OUT0
¼
VCC
IREF
OUTn
¼
RIREF
GND OUT15
VOUTn
VOUTFIX
Figure 6. Constant-Current Test Circuit for OUTn
8
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TLC5928
SBVS120E – JULY 2008 – REVISED JANUARY 2011
www.ti.com
TIMING DIAGRAMS
TWH0, TWL0, TWH1, TWH2, TWL2:
VCC
(1)
INPUT
50%
GND
TWH
TWL
TSU0, TSU1, TH0, TH1:
VCC
CLOCK
(1)
INPUT
50%
GND
TSU
TH
VCC
DATA/CONTROL
(1)
INPUT
50%
GND
(1)
Input pulse rise and fall time is 1 ns to 3 ns.
Figure 7. Input Timing
tR0, tR1, tF0, tF1, tD0, tD1, tD2:
VCC
(1)
INPUT
50%
GND
tD
VOH or VOUTn
90%
OUTPUT
50%
10%
VOL or VOUTn
tR or tF
(1)
Input pulse rise and fall time is 1 ns to 3 ns.
Figure 8. Output Timing
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TLC5928
SBVS120E – JULY 2008 – REVISED JANUARY 2011
SIN
DATA
0A
DATA
15B
DATA
13B
DATA
14B
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DATA
12B
DATA
11B
DATA
3B
DATA
2B
DATA
0B
DATA
1B
TH0
TSU0
TH1
TWH0
DATA
15C
DATA
14C
DATA
13C
DATA
12C
DATA
11C
DATA
10C
1
2
3
TWL0
4
5
6
TSU1
SCLK
1
2
3
4
5
13
14
15
16
TWH1
LAT
Shift Register
LSB Data (Internal)
DATA
0A
LOD
0
DATA
15B
DATA
14B
DATA
13B
DATA
12B
DATA
3B
DATA
2B
DATA
1B
Shift Register
LSB+1 Data (Internal)
DATA
1A
LOD
1
LOD
0
DATA
15B
DATA
14B
DATA
13B
DATA
4B
DATA
3B
Shift Register
MSB-1 Data (Internal)
DATA
14A
LOD
14
LOD
13
LOD
12
LOD
11
LOD
10
LOD
1
Shift Register
MSB Data (Internal)
DATA
15A
LOD
15
LOD
14
LOD
13
LOD
12
LOD
11
LOD
2
DATA
15C
DATA
14C
DATA
13C
DATA
12C
DATA
11C
DATA
2B
LOD 1A or PTW_A
LOD
0A
DATA
15C
DATA
14C
DATA
13C
DATA
12C
LOD
0
DATA
15B
LOD 14A or PTW_A
LOD
13A
LOD
12A
LOD
11A
LOD
10A
LOD
9A
LOD
1
LOD
0
LOD 15A or PTW_A
LOD
14A
LOD
13A
LOD
12A
LOD
11A
LOD
10A
¼
LOD 0A or PTW_A
¼
¼
On/Off Control
Latch Data (Internal)
SOUT
DATA
0B
DATA
15B
Previous On/Off Latch Data
DATA
15A
LOD
15
LOD
14
LOD
13
tD0
LOD
12
LOD
11
LOD
2
LOD
0
LOD
1
DATA
15B
Latest On/Off Latch Data
LOD
14A
LOD 15A or PTW_A
tR0/tF0
LOD
13A
LOD
12A
LOD
11A
LOD
10A
tWH2
BLANK
tWL2
tD2
tD1
OFF
OUTn
(1)
ON
OFF
OUTn
(2)
tD2
tF1
tD1
OFF
(3)
ON
ON
OFF
OFF
OUTn
(4)
tOUTON
OFF
ON
ON
OFF
OUTn
tD1
OFF
ON
ON
tR1
ON
(1) On/off latched data are '1'.
(2) On/off latched data are changed from '1' to '0' at the second LAT signal.
(3) On/off latched data are changed from '0' to '1' at the second LAT signal.
(4) On/off latched data are '0'.
Figure 9. Timing Diagram
10
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TYPICAL CHARACTERISTICS
At VCC = 3.3 V and TA = +25°C, unless otherwise noted.
REFERENCE RESISTOR
vs OUTPUT CURRENT
POWER DISSIPATION RATE
vs FREE-AIR TEMPERATURE
4000
100000
Power Dissipation Rate (mW)
Reference Resistor (W)
TLC5928PWP
25200
10080
10000
5040
3360
2520
2016
1680
3000
TLC5928RGE
2000
TLC5928DBQ
1000
1440
0
1000
0
15
10
5
20
30
25
TLC5928PW
35
-40
Figure 11.
OUTPUT CURRENT vs
OUTPUT VOLTAGE
OUTPUT CURRENT vs
OUTPUT VOLTAGE
40
IO = 35 mA
TA = +25°C
IO = 30 mA
Output Current (mA)
25
IO = 20 mA
20
15
IO = 10 mA
10
IO = 5 mA
5
100
38
30
IO = 2 mA
80
IO = 30 mA
39
35
Output Current (mA)
60
40
Free-Air Temperature (°C)
Figure 10.
40
0
37
36
35
34
33
TA = -40°C
32
TA = +25°C
31
TA = +85°C
30
0
1.5
1.0
0.5
2.0
2.5
0
3.0
1.0
0.5
1.5
2.0
Output Voltage (V)
Output Voltage (V)
Figure 12.
Figure 13.
ΔIOLC vs AMBIENT TEMPERATURE
2.5
3.0
ΔIOLC vs OUTPUT CURRENT
4
4
IO = 35 mA
TA = +25°C
3
3
2
2
1
1
DIOLC (%)
DIOLC (%)
20
0
-20
Output Current (mA)
0
-1
-2
0
-1
-2
VCC = 3.3 V
-3
VCC = 3.3 V
-3
VCC = 5 V
-4
VCC = 5 V
-4
-40
-20
0
20
40
60
80
100
0
Ambient Temperature (°C)
10
20
30
40
Output Current (mA)
Figure 14.
Figure 15.
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TYPICAL CHARACTERISTICS (continued)
At VCC = 3.3 V and TA = +25°C, unless otherwise noted.
CONSTANT-CURRENT OUTPUT
VOLTAGE WAVEFORM
CH1 (2 V/div)
CH1-BLANK
(20 ns)
CH2 (2 V/div)
CH2-OUT0
(BLANK = 20 ns)
CH3 (2 V/div)
CH3-OUT15
(BLANK = 20 ns)
IOLC = 35 mA
TA = +25°C
RL = 130 W
CL = 15 pF
VLED = 5.5 V
Time (12.5 ns/div)
Figure 16.
12
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DETAILED DESCRIPTION
SETTING FOR THE CONSTANT SINK CURRENT VALUE
The constant-current values are determined by an external resistor (RIREF) placed between IREF and GND. The
resistor (RIREF) value is calculated by Equation 1.
RIREF (kW) =
VIREF (V)
´ 42
IOLC (mA)
Where:
VIREF = the internal reference voltage on the IREF pin (typically 1.20 V)
(1)
IOLC must be set in the range of 2 mA to 35 mA. The constant sink current characteristic for the external resistor
value is shown in Figure 10. Table 1 describes the constant-current output versus external resistor value.
Table 1. Constant-Current Output versus External Resistor Value
IOLCMax (mA, Typical)
RIREF (kΩ)
35
1.44
30
1.68
25
2.02
20
2.52
15
3.36
10
5.04
5
10.1
2
25.2
CONSTANT-CURRENT DRIVER ON/OFF CONTROL
When BLANK is low, the corresponding output is turned on if the data in the on/off control data latch are '1' and
remains off if the data are '0'. When BLANK is high, all outputs are forced off. This control is shown in Table 2.
Table 2. On/Off Control Data Truth Table
ON/OFF CONTROL LATCH DATA
CONSTANT-CURRENT OUTPUT STATUS
0
Off
1
On
When the IC is initially powered on, the data in the on/off control shift register and data latch are not set to the
respective default value. Therefore, the on/off control data must be written to the data latch before turning the
constant-current output on. BLANK should be at a high level when powered on because the constant-current
may be turned on as a result of random data in the on/off control latch.
The on/off data corresponding to any unconnected OUTn outputs should be set to ‘0’ before turning on the
remaining outputs. Otherwise, the supply current (ICC) increases while the LEDs are on.
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REGISTER CONFIGURATION
The TLC5928 has an on/off control data shift register and data latch. Both the on/off control shift register and
latch are 16 bits long and are used to turn on/off the constant-current drivers. Figure 17 shows the shift register
and latch configuration. The data at the SIN pin are shifted in to the LSB of the shift register at the rising edge of
the SCLK pin; SOUT data change at the rising edge of SCLK. The timing diagram for data writing is shown in
Figure 18. The driver on/off is controlled by the data in the on/off control data latch.
The on/off data are latched into the data latch by a rising edge of LAT after the data are written into the on/off
control shift register by SIN and SCLK. At the same time, the data in the on/off control shift register are replaced
with LED open detection (LOD) and pre-thermal warning (PTW) data. Therefore, LAT must be input only once
after the on/off data update to avoid the on/off control data latch being replaced with LOD and PTW data in the
shift register. When the IC is initially powered on, the data in the on/off control shift register and latch are not set
to the default values; on/off control data must be written to the on/off control data latch before turning the
constant-current output on. BLANK should be high when the IC is powered on because the constant-current may
be turned on at that time as a result of random values in the on/off data latch. All constant-current outputs are
forced off when BLANK is high.
On/Off Control Shift Register (1 Bit ´ 16 Channels)
SOUT
MSB
15
14
13
12
On/Off Data
for
OUT15
On/Off Data
for
OUT14
On/Off Data
for
OUT13
On/Off Data
for
OUT12
4
11
¼
3
2
1
LSB
0
On/Off Data
for
OUT3
On/Off Data
for
OUT2
On/Off Data
for
OUT1
On/Off Data
for
OUT0
3
2
1
LSB
0
On/Off Data
for
OUT3
On/Off Data
for
OUT2
On/Off Data
for
OUT1
On/Off Data
for
OUT0
SIN
SCLK
¼
MSB
15
14
13
12
On/Off Data
for
OUT15
On/Off Data
for
OUT14
On/Off Data
for
OUT13
On/Off Data
for
OUT12
On/Off Control Data Latch (1 Bit ´ 16 Channels)
4
11
¼
LAT
16 Bits
To Constant Current Driver Control Block
Figure 17. On/Off Control Shift Register and Latch Configuration
14
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SIN
DATA
0A
DATA
15B
DATA
14B
DATA
13B
DATA
12B
DATA
11B
1
2
3
4
5
DATA
3B
DATA
2B
DATA
1B
DATA
0B
DATA
15C
DATA
14C
DATA
13C
DATA
12C
DATA
11C
DATA
10C
16
1
2
3
4
5
6
SCLK
13
14
15
LAT
DATA
0A
LOD
0
DATA
15B
DATA
14B
DATA
13B
DATA
12B
DATA
3B
DATA
2B
DATA
1B
Shift Register
LSB+1 Data (Internal)
DATA
1A
LOD
1
LOD
0
DATA
15B
DATA
14B
DATA
13B
DATA
4B
DATA
3B
Shift Register
MSB-1 Data(Internal)
DATA
14A
LOD
14
LOD
13
LOD
12
LOD
11
LOD
10
LOD
1
Shift Register
MSB Data(Internal)
DATA
1A
LOD
15
LOD
14
LOD
13
LOD
12
LOD
11
LOD
2
On/Off Control
Latch Data (Internal)
SOUT
LOD 0A or PTW_A
DATA
15C
DATA
14C
DATA
13C
DATA
12C
DATA
11C
DATA
2B
LOD 1A or PTW_A
LOD
0A
DATA
15C
DATA
14C
DATA
13C
DATA
12C
LOD
0
DATA
15B
LOD 14A or PTW_A
LOD
13A
LOD
12A
LOD
11A
LOD
10A
LOD
9A
LOD
1
LOD
0
LOD 15A or PTW_A
LOD
14A
LOD
13A
LOD
12A
LOD
11A
LOD
10A
DATA
0B
¼
¼
¼
Shift Register
LSB Data (Internal)
DATA
15B
Latest On/Off Latch Data
Previous On/Off Latch Data
DATA
1A
LOD
15
LOD
14
LOD
13
LOD
12
LOD
11
LOD
2
LOD
1
LOD
0
DATA
15B
LOD 15A or PTW_A
LOD
14A
LOD
13A
LOD
12A
LOD
11A
LOD
10A
BLANK
OUTn
(1)
ON
OUTn
(2)
(3)
ON
OFF
OFF
ON
OUTn
OFF
OFF
OFF
ON
OFF
ON
OUTn
(4)
OFF
OFF
ON
OFF
OFF
ON
(1) On/off latched data are '1'.
(2) On/off latched data are changed from '1' to '0' at the second LAT signal.
(3) On/off latched data are changed from '0' to '1' at the second LAT signal.
(4) On/off latched data are '0'.
Figure 18. On/Off Control Operation
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LED OPEN DETECTION (LOD) AND PRE-THERMAL WARNING (PTW)
The LED open detection (LOD) circuit checks the voltage of each active (that is, on) constant-current sink output
(OUT0 through OUT15) to detect open LEDs and LEDs shorted to GND while BLANK is low. The LOD bits in the
status information data register (SID) are set to '1' if the voltage of the corresponding OUTn pin is less than the
LED open detection threshold (VLOD = 0.3 V, typ). The status information data can be read from the SOUT pin.
To avoid false detection of open LEDs, the LED driver design must ensure that the constant-current sink output
voltage is greater than 0.3 V when the outputs are on. Also, the output on-time must be 1 ms or greater to
correctly read the valid LOD status.
The PTW function indicates that the IC junction temperature is too high. The PTW bit in the SID data is set to '1'
while the IC junction temperature exceeds the temperature threshold (T(PTW) = +138 °C, typ). If the IC junction
temperature decreases below the temperature of T(PTW), the SID data are set depending on the LOD function.
The constant-current outputs are not forced off during PTW conditions, so the controller should take appropriate
action (such as reducing the duty cycle of effected channels).
The LOD and PTW data are latched into the SID latch with the rising edge of BLANK and do not change until
BLANK goes low. The SID data latched in the latch are transferred into the on/off shift register with a rising edge
of LAT. SID can be shifted out from SOUT with rising edges of SCLK. The data in the on/off control shift register
are replaced with the LOD and PTW data at the rising edge of LAT. Therefore, LAT should be input only once
after the shift data are updated to avoid the on/off control data latch information from being replaced with LOD
and PTW data in the shift register. A timing diagram for LOD, PTW, and SID is shown in Figure 19.
BLANK
OUTn
OUTn OFF
OUTn ON
VOUTn
GND
LOD circuit needs 1ms to detect LED
open correctly as maximum.
LOD Circuit Data
(Internal)
PTW Circuit Data
(Internal)
No Error Information
If the voltage of OUTn (VOUTn) is less than VLOD (0.3 V, typ) when OUTn is on,
then the LOD circuit reports error information to the LOD data latch
and the error information is set as '1' to the bit that corresponds with
the error OUTn in the LOD data latch.
Latest Error Information From LOD Circuit
LOD and PTW data are always copied into
SID data latch while BLANK is low level.
TJ < T(PTW):
Normal Temperature
TJ ³ T(PTW): High Temperature
No Error Information
TJ < T(PTW):
Normal Temperature
LOD and PTW data of from before
BLANK goes high are held in the
SID data latch at the rising edge of BLANK.
Previous LOD and PTW Data
SID Data Latch
(Internal)
PTW Error
Latest Error Information From LOD and PTW Circuit
No Error Information
Figure 19. LOD/PTW/SID timing
16
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STATUS INFORMATION DATA (SID)
The latched LED open detection (LOD) error and pre-thermal warning (PTW) in the SID data latch are shifted out
onto the SOUT pin with each rising edge of SCLK. If a PTW is reported, all LOD error bits are set to '1'. The SID
data are written over the data in the on/off control shift register at the rising edge of LAT. Therefore, the previous
data in the on/off control shift register are lost when SID information is latched in. Figure 20 shows the SID bit
assignments. See Figure 7 for the read timing of SID.
When the IC is powered on, the initial LOD data are invalid. Therefore, LOD data must be read after the rising
edge of BLANK. Table 3 shows a truth table for LOD and PTW.
Table 3. LOD and PTW Truth Table
LED open detection (LODn)
Pre-thermal warning (PTW)
CONDITION
SID DATA
LED is connected (VOUTn > VLOD)
'0' (low level at SOUT)
LED is opened or shorted to GND
(VOUTn ≤ VLOD and output on)
'1' (high level at SOUT); set to the bit that has an
LED error condition
IC temperature is low (IC temperature ≤ T(PTW))
Depend LED open error
IC temperature is high (IC temperature > T(PTW))
All bits = '1' (high level at SOUT)
SID Data Latch (1 Bit ´ 16 Channels)
MSB
15
14
13
12
OUT15
LOD Data
(LOD 15)
OUT15
LOD Data
(LOD 14)
OUT15
LOD Data
(LOD 13)
OUT15
LOD Data
(LOD 12)
4
11
¼
3
2
1
LSB
0
OUT15
LOD Data
(LOD 3)
OUT15
LOD Data
(LOD 2)
OUT15
LOD Data
(LOD 1)
OUT15
LOD Data
(LOD 0)
All Bits Become ‘1’ When the IC is in a PTW (Pre-Thermal Warning) Condition
¼
SOUT
MSB
15
14
13
12
On/Off Data
for
OUT15
On/Off Data
for
OUT14
On/Off Data
for
OUT13
On/Off Data
for
OUT12
4
11
¼
3
2
1
LSB
0
On/Off Data
for
OUT3
On/Off Data
for
OUT2
On/Off Data
for
OUT1
On/Off Data
for
OUT0
SIN
SCLK
The 16 bits in the SID latch are loaded into the on/off shift register at the rising edge of LAT.
SID Control Shift Register (1 Bit ´ 16 Channels)
Figure 20. Status Information Data Configuration
LAYOUT CONSIDERATIONS
The output current transient time in the TLC5928 is very fast. In addition, all outputs turn on or off at the same
time to minimize the output on-time error. This high current demand can cause GND to shift in the entire system,
and lead to false triggering of signals. To overcome this issue, design all GND lines to be as wide and short as
possible in order to reduce parasitic inductance and resistance.
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TLC5928
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REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision D (August 2010) to Revision E
•
Page
Added Layout Considerations section ................................................................................................................................ 17
Changes from Revision C (November 2008) to Revision D
Page
•
Changed SO-24 to SSOP-24/QSOP-24 in Package/Ordering Information table ................................................................. 2
•
Changed SO-24 to SSOP-24/QSOP-24 in Dissipation Ratings table .................................................................................. 2
•
Updated functional block diagram ........................................................................................................................................ 5
•
Changed SO-24 to SSOP-24/QSOP-24 in DBQ and PW Packages pinout ......................................................................... 6
•
Updated Figure 9 ................................................................................................................................................................ 10
•
Updated Figure 18 .............................................................................................................................................................. 15
18
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PACKAGE OPTION ADDENDUM
www.ti.com
19-Oct-2022
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
Samples
(4/5)
(6)
TLC5928DBQ
ACTIVE
SSOP
DBQ
24
50
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 85
TLC5928
Samples
TLC5928DBQR
ACTIVE
SSOP
DBQ
24
2500
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 85
TLC5928
Samples
TLC5928PW
ACTIVE
TSSOP
PW
24
60
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
PJ5928
Samples
TLC5928PWP
ACTIVE
HTSSOP
PWP
24
60
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 85
PJ5928
Samples
TLC5928PWPR
ACTIVE
HTSSOP
PWP
24
2000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 85
PJ5928
Samples
TLC5928PWR
ACTIVE
TSSOP
PW
24
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
PJ5928
Samples
TLC5928RGER
ACTIVE
VQFN
RGE
24
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 85
TLC
5928
Samples
TLC5928RGET
ACTIVE
VQFN
RGE
24
250
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 85
TLC
5928
Samples
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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