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DRV8305-Q1: Current sense output (SO) settling time upon power-up

Alan O
Mastermind 32575 points
Part Number: DRV8305-Q1

Hello,

I'd like to know how much time does it take for the SO output to stabilize after the DRV8305N-Q1 is initially powered up, starting from when EN_GATE and PVDD go high (assuming they turn-on together)?

Thanks,
Alan

  • 0
    TI__Guru 61280 points

    Alan,

    Could you explain the reasoning for needing this info?

    If the customer is trying to use the device very soon after power up, the datasheet recommends waiting 1ms after EN_GATE goes high to allow the charge pump and low side regulator to come up.

    On my setup I measured the CSA output coming up to 1.65V 1-2ms after PVDD reached 4.4V (min PVDD operating). I didn't see any appreciable settling time since we have our CSA output filtered.

    Other than this the datasheet does specify settling time per gain setting.

    Regards,

    -Adam