TPS23754: reboot reson

user6101854

Part Number: TPS23754

HI:

There is POE circuit based on TPS23754,The design has a problem,the 12V output voltage will restart. Waveform diagram is as follows:

The roboting reson is unknown, I need help。

over 4 years ago

0 Darwin Fernandez over 4 years ago

TI__Mastermind 40100 points

Hi User,

Do you have schematic of your design? Thanks!

0 user6101854 over 4 years ago in reply to Darwin Fernandez

Prodigy 30 points

The part of schematic is as follows:

0 user6101854 over 4 years ago in reply to Darwin Fernandez

Prodigy 30 points

Hi,

What do you think of this problem?

0 Darwin Fernandez over 4 years ago in reply to user6101854

TI__Mastermind 40100 points

Hi User,

I am unable to see the secondary circuitry. I bet the the output is back driving the converter due to large output bulk cap and high output voltage. Can you add a load to the output to see if you can discharge the output cap fast enough to not cause the synch FET to turn ON during shutdown?

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TPS23754: reboot reson