TLC5925IPWR datasheet(13/22 Pages) TI

13 / 22 page

APPLICATION INFORMATION

Operating Principles

Constant Current

Adjusting Output Current

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TLC5925

www.ti.com .............................................................................................................................................................................................. SLVS765 – OCTOBER 2008

In LED display applications, TLC5925 provides nearly no current variations from channel to channel and from IC

to IC. While IOUT ≤ 45 mA, the maximum current skew between channels is less than ±5% and between ICs is

less than ±6%.

TLC5925 sets IOUT based on the external resistor Rext. Users can follow the below formulas to calculate the

target output current IOUT,target in the saturation region:

IOUT,target = (1.21 V / Rext) × 18, where Rext is the external resistance connected between R-EXT and GND.

Therefore, the default current is approximately 26 mA at 840

Ω and 13 mA at 1680 Ω. The default relationship

after power on between IOUT,target and Rext is shown in Figure 5.

Figure 5. Default Relationship Curve Between IOUT,target and Rext After Power Up

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TLC5925IPWR Datasheet(PDF) 13 Page - Texas Instruments

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