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TPS92638-Q1: Regarding selection of the Led Driver and components for the application

Vishaal S
Prodigy 10 points
Part Number: TPS92638-Q1

Tool/software:

Hi sir, 

This is Vishaal working as an Hardware Engineer. We are planning to use TPS92638-Q1 for our Automotive application where the main working is the 6 LEDs each will be connected in 6 Channels (1 LED per channel) and LEDs will turn on/ off based on the magnetic sensor. For interior Lighting we are planning to use PWMs which will be controlled by Magnetic sensor. As we are not using the REFHI Pin so, we are planning to Pull it down with a 100kOhm Resistor at STOP Pin.  REF resistor value as per datasheet is calculated for our Output current 11mA we are planning to use 22k Ohm resistor with 1% Tolerance for R(REF) and the unused PWM we are planning to ground with a 100k Ohm resistor. Please confirm this as soon as possible so that we can start with our design.

Thanks, 

Vishaal S

  • 0
    TI__Prodigy 510 points

    Hello Vishaal,

    A 100k Ohm pull down resistor for the STOP pin is acceptable.

    A 22k Ohm will result in an output current of 11.11mA so this calculation is correct.

    100k Ohm pull down resistors for the unused PWM pins is acceptable.

    If you have any questions, please let me know

    Kind Regards,

    Nicholas Alexander