TLC5925_15 Datasheet, PDF (12/28 Pages) Texas Instruments – Low-Power 16-Channel Constant-Current LED Sink Driver

TLC5925
SLVS765B – OCTOBER 2008 – REVISED SEPTEMBER 2015
8 Detailed Description
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8.1 Overview
The TLC5925 is a 16-channel LED driver designed for LED displays and LED lighting applications. The TLC5925
contains a 16-bit shift register and data latches, which convert serial input data into parallel output format. At the
TLC5925 output stage, 16 regulated-current ports provide uniform and constant current for driving LEDs within a
wide range of VF variations. Used in system design for LED display applications (for example, LED panels), the
TLC5925 provides great flexibility and device performance. Users can adjust the output current from 3 mA to 45
mA through an external resistor, REXT, which gives flexibility in controlling the light intensity of LEDs. TLC59025
is designed for up to 17 V at the output port. The high clock frequency, 30 MHz, also satisfies the system
requirements of high-volume data transmission.
8.2 Functional Block Diagram
OUT0 OUT1 OUT14 OUT15
R-EXT
I/O REGULATOR
VDD
OE
LE
CONTROL
LOGIC
8
OUTPUT DRIVER
16
16
16-BIT OUTPUT
LATCH
CLK
SDI
CONFIGURATION
LATCHES
16
8
16-BIT SHIFT
REGISTER
SDO
16
8.3 Feature Description
8.3.1 Constant Current
In LED display applications, TLC5925 provides nearly no current variations from channel to channel and from IC
to IC. While I_OUT ≤ 45 mA, the maximum current skew between channels is less than ±5% and between ICs is
less than ±6%.
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