TLC5916-Q1_16 Datasheet, PDF (25/34 Pages) Texas Instruments – 8-Bit Constant-Current LED Sink Drivers

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TLC5916-Q1, TLC5917-Q1
SLVS814A – JANUARY 2008 – REVISED MAY 2015
10.2 Typical Applications
10.2.1 Single Implementation of TLC591x-Q1 Device
The TLC5917/TLC5917-Q1 Constant-Current LED Sink Drivers is designed to work alone or cascaded. Figure 20
shows implementation of a single TLC591x-Q1 device.
VLED
VDD: 3.0V to 5.5V
SDI
SDI
CLK
CLK
LE
LE
OE
OE
VDD
SDO
R-EXT
GND
To Controller if Error
Detection Used
Figure 20. Single Implementation of TLC591x-Q1 Device
10.2.1.1 Design Requirements
For this design example, use the parameters listed in Table 6. The purpose of this design procedure is to
calculate the power dissipation in the device and the operating junction temperature.
Table 6. Design Parameters
DESIGN PARAMETER
Number of LED strings
Number of LEDs per string
LED Current (mA)
Forward voltage of each LED (V)
Junction-to-ambient thermal
resistance (°C/W)
Ambient temperature of application
(°C)
VDD (V)
IDD (mA)
Max operating junction temperature
(°C)
EXAMPLE VALUE
8
3
20
3.5
86.9
115
5
10
150
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