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Power Suply Vdd = 4.2V or Vdd = 4.6V for LED drivers

Abel Valero
Prodigy 230 points
Other Parts Discussed in Thread: TLC59482

Dear collegues,

I'm checking the datasheets of many Texas Instruments drivers and normally you find the electrical and switching characteristics for 3.3 V and 5 V.

Nowadays the trend is to use efficiency and power saving using power supplies of 4.2 V or 4.6 V for example. I'll use TLC59482:

www.ti.com/.../tlc59482.pdf

If I'm going to use a power supply for both Vdd for drivers and Vled, how can I know the parameters to calculate the resistors (Rext) to control the current on each channel or the knee voltage of the driver?

Thanks