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Original question:

TPS51200-Q1: Can VLODIN be powered up before VIN?

TPS51200-Q1: REFIN before VIN/EN overshoot magnitude and mitigation?

Jason Garr
Prodigy 10 points
Part Number: TPS51200-Q1

It is mentioned in a few threads that if VIN/EN come up after REFIN there is some overshoot to be expected on the output.  

1. How much overshoot is expected?

2. Can the overshoot be reduced by delaying EN a ms or two after VIN is up with an RC filter?

  • +1
    TI__Mastermind 20235 points

    Hi Jason,

    I've seen anywhere from 200mV to 300mV of overshoot.

    I believe the overshoot occurs on REFOUT when VIN ramps after REFIN is biased.

    So if VO remains disabled until the REFOUT overshoot has passed by holding EN low for a bit longer longer using the filter, the overshoot shouldn't show up on VO since it follows REFOUT.

    Regards,

    James