TLC59025IPWR datasheet(13/21 Pages) TI

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APPLICATION INFORMATION

Operating Principles

Constant Current

Adjusting Output Current

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TLC59025

www.ti.com ...................................................................................................................................................................................................... SLVS934 – JUNE 2009

In LED display applications, TLC59025 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%.

TLC59025 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) × 15.5, where Rext is the external resistance connected between R-EXT and GND.

Therefore, the default current is approximately 26 mA at 720

Ω and 13 mA at 1440 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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