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TPS62816-Q1: Tpd from disable to discharge

Alexander Skulsky
Intellectual 270 points
Part Number: TPS62816-Q1

Hi

According to the datasheet, there is an active discharge on the IC output.

what is the minimum time delay from Disable (EN pin deserted) to the discharge to start operating?

Thanks

Alex

  • 0
    TI__Expert 5425 points

    Hi Alex,

    the minimum delay time ideally is zero, technically it will be within a few gate delay times. But I think this is negligible compared to the delay between enable low and the time when both power switches can be safely turned off. This delay time depends on the actual switching phase when the enable is pulled low. So the delay between enable low,  converter disabled and discharge enabled can be up to one switching period. 

    I hope this helps. 

    Best regards,

    Juergen

  • 0 in reply to Juergen
    Intellectual 270 points

    Hi Jurgen

    So assuming a 2.5Mhz switching frequency. The discharge will start within 1uS from the moment the EN pin is deasserted?

    There is no Tpd of internal logic?

    Thanks

    Alex

  • 0 in reply to Alexander Skulsky
    TI__Expert 5425 points

    2.5MHz would correspond to 400ns. There is no timer generating a delay. The discharge can start latest one switching cycle after disabling the device, but it also can start directly (within a few ns gate delay) after disabling the device. This depends on the switching phase of the power stage.

    If you externally connect an additional discharge circuit I would recommend to wait at least one switching cycle before turning it on to avoid shorting the supply through the high side switch.