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TPS92630-Q1: Resistor Calculations missing from datasheet

Part Number: TPS92630-Q1

Hi There,

My customer is using TPS92630 for Rev and Fog function in a rear lamp design. For the schematic, they have followed the application diagram in the datasheet, but they are stuck with some of the resistor calculations.

Can you help me to select R1a,R1b,R2a,R2b,R3a and R3b resistors, and also the formula of how you select these please?

BR,

Ross

  • Hi Ross,

    Please refer to the page 19 in the datasheet, you can select the resistors according to the LED number and Vf of the LED to set the detection threshold value.

    A reminder for this selection, since the divider resistor network is connected to OUTPUT directly, the value shouldn't be too small to avoid a large current separating from the LED string. Generally, a few milliamps or microamps should be fine.

    BR,

    Hailee.