TLC59116-Q1 Datasheet, PDF (31/39 Pages) Texas Instruments – 16-Channel Constant-Current LED Sink Driver

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TLC59116-Q1
SLDS223A – MARCH 2016 – REVISED MARCH 2016
10.2 Typical Application
The TLC59116-Q1 outputs can be wired in parallel to increase the current per LED string.
VLED
VCC
SDA
SCL
RESET
VCC
SDA
SCL
A0
A1
A2
A3
RESET
REXT
GND
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
Address: 00h
Figure 23. Parallel Channels
10.2.1 Design Requirements
Set the LED current to 50 mA while the IREF register is at the default value (CG = 0.992).
10.2.2 Detailed Design Procedure
The goal of this design is to set the LED current to 50 mA. Because two outputs are in parallel, the LED current
should actually be set to 25 mA. With the IREF register at the default value:
I_OUT,target = ( 1.25 V / R_EXT ) × 15
(8)
Using this equation, the appropriate R_EXT is calculated to be 750 Ω.
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