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TPS62816-Q1: TPS62816-Q1 ramp up waveform is stepped

Harvey Nie
Prodigy 170 points
Part Number: TPS62816-Q1

Hi expert,

When I test TPS62816QWRWYRQ1 performance, I find its ramp up waveform is stepped. SCH & waveform as below. Is this correct? And why is this?

 

Best regards,

Harvey Nie

  • 0
    TI__Genius 15170 points

    Hi Harvey,

    According to your waveform, it looks like device  is in PFM mode. You can confirm it with checking the switching waveform parallel to start up. During start up device will work in PFM mode. It is normal behavior for device. Let me know if it can concern to the application.

    Thanks,

    Tanvee

  • 0 in reply to Tanvee
    Prodigy 170 points

    Hi Tanvee,

    The MODE pin is pulled high, the device should be running in forced PWM mode. As you say, "During start up device will work in PFM mode", can this information be find in the datasheet? I verified your statement by measuring switching waveform.

    Usually, I use FPWM mode in my design. The waveform should ramp up smoothly. I don't know if this behavior is risky in application. Is there a way to make the device in FPWM mode at any time?

    Best regards,

    Harvey Nie

  • +1 in reply to Harvey Nie
    TI__Genius 15170 points

    Hi Harvey,

    Thanks for confirmation on bench. It is device architecture and device will enter into PWM mode once PFM threshold is reach.

    Start up behavior is shown in the datasheet and you can also simulate it through mode to analyze it. 

    Best regards,

    Tanvee