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TLV758P: tlv758p Vout drift issue

Mason Liu
Expert 4035 points
Part Number: TLV758P

Hi,

TLV758P now use in Vin: 3.3V, Vout: 1.2V, but when Vin has voltage ripple, then Vout will drift to 1.9V, measure Vin ripple is about 70mV, my question is:

1. What is TLV758P Vin ripple tolerance? i didn't find it in the datasheet.

2. Why Vin ripple will cause Vout drift? any possible reasons?

Thanks

Best regrads

Mason Liu

  • 0
    TI__Mastermind 23361 points

    Hi Mason,

    1. What is TLV758P Vin ripple tolerance? i didn't find it in the datasheet.

    We normally don't have a ripple tolerance speicification for LDO. However, you can use PSRR curves to estimate the voltage ripple at the output using the amplitude of ripple at the input and ripple frequencies. 

    2. Why Vin ripple will cause Vout drift? any possible reasons?

    In order to identify possible causes on the shift, wil you provide a clean measurement that shows the voltage of Vin, Vout and FB pins?

    Regards,
    Jason Song

  • 0 in reply to Jason Song
    TI__Mastermind 23361 points

    Hi Mason, 

    Since it has been a week without a reply, we assume that this issue has been resolved.  If this is not the case, please feel free to reply.

    Regards, 
    Jason Song

  • 0 in reply to Jason Song
    TI__Expert 4035 points

    Hi Jason,

    Sorry for the late reply, the problem has been solved, thanks a lot for your help.

    Best regards

    Mason