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TPS92630-Q1: PWMing before current is flowing to LED and max output capacitance

Jared Becker
Genius 11845 points
Part Number: TPS92630-Q1

Hi Team,

In my circuit, I am providing voltage to an LED string via the TPS92630-Q1, but use a low side switch between the cathode of the LED and ground to allow current to flow through the LED and turn it on. Therefore, the TPS92630-Q1 is always on. Before I close the switch, I am curious if I am able to provide a PWM signal to the PWM pin before any current begins to flow to the LED? The goal of this would be to control how fast the LED comes to full brightness and adjust my PWM to control the brightness as the LED comes on.

My second question is what is the max amount of capacitance the TPS92630-Q1 is allowed to have on the output?

Thank you!

Jared

  • 0
    TI__Expert 5475 points
    HI Jared,

    sorry I don't quite understand the meaning of using a low side switch here. Why don't you just use the PWM input to turn on and off the LED?
    By increasing the PWM duty cycle gradually during startup, you can control the brightness accordingly.

    For the second question, we usually see a maximum capacitance of 100nF on the output. We haven't verified its performance with larger output capacitor.


    Best Regards,
    Shirley He