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TPS92602-Q1: Increasing start up and pulse response times

Jeff Coletti
Expert 8645 points
Part Number: TPS92602-Q1

Hi Support team

I am working on a customer application for an industrial camera. The issue I am having is the tps92602 is not responding fast enough to the frame clock and also to changes in the load conditions. 

In the LED bank, one bank contains 8 leds in 4 sets (2 leds each set). THhy are using discrete fets to change the number of LEDS in the string for shadowing.  The issue we are having is when we try to pulse at 120 frames per sec, the device is not responding fast enough. We are driving a string of 8 LEDS 4.2v each at 1.5~2 Amps. They may drive all 8 LEDS at once or just 2 LEDS via the switching network. 

My two questions are is the the best part, I am using a dual because there are two different LED Banks? Second, is there a way I can speed up the response on the evm? They are testing boost to battery, they have a 12 volt input. 

Thanks

Jeff Coletti

  • 0
    TI__Genius 11836 points

    Hi, Jeff,

         Sorry for the delay. Proper engineer has been assigned to take a look at this and will reply you soon.

  • 0
    TI__Genius 15776 points

    Hello Jeff,

    Glad to discuss issues with you.I have some questions to confirm.

    1)what is LED bank and set , do your mean the connection of 8 LEDs are series.All LEDs call a bank , every two of them call a set.

    2)Is there a discrete fet in parallel with each set? you shut down the LED by open the fet(short LED set) .

    3)Dose "pulse at 120 frames per sec" means the fet work at 120Hz?

    4)how do you define responding speed, could you give me some waveform of your experiment.

    Frank