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TPS54623: When the input voltage is linearly lowered to be lower than the output voltage

Part Number: TPS54623


My customer wnats to use the TPS54623 with the following conditions.

   - VIN = 13V~15.5V, VOUT = fixed 12V, IOUT = 1A

If the VIN voltage is linearly changed from 13V to 10.7V, will the output 12V also drop linearly like the input voltage?

If there is any output voltage change data for such input voltage change, please share it.



  • Hello,

    When the VIN voltage is linearly lowered from 13V to 10.7V, at the beginning for a few hundreds of mV the 12V output will stay intact and regulating.

    Then at certain point between 13V and 12V, the duty cycle will hit the max allowed duty and starting at that point, the output will linearly go down with Vin going down.

    We do not have any output voltage change data for such input voltage change to share. And I am not exactly sure where exactly between 13V and 12V the output starts to drop.

    If you want to know the exact voltage point, you can probably run an experiment to find out the location empirically.

    Hope this makes sense.


    Yitzhak Bolurian