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TPS7A66-Q1: The Reset Delay Timer of TPS7A6633

Nick Hsiao19
Intellectual 615 points
Part Number: TPS7A66-Q1

Hello,

I've measured the Vout vs Powergood timing as attachment, and the delay time is about 7ms. My delay capacitor value is 0.01uF, I am not sure if the result is good or not. Because from the equation: Tct=Cct*1V/1uA, the Tct should be 10ms. 

By the way, the EN pin pull-high resistor to Vin is 100k ohm, is it too high?

Thanks,

Nick.

  • 0
    TI__Guru 50190 points

    Hi Nick,

    The results you are seeing are as expected. While equation 1 in the datasheet shows the charging currents as 1uA:

    the4 actual typical value is 1.4uA:

    If you use this for the denominator of equation 1, you get ~7ms.

    The 100K resistor pulling up Enable should be fine. 

    I hope this answers your question.

    Regards,