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TPS23754: output short test

Tommy Tzeng
Genius 5790 points
Part Number: TPS23754

Hi Sir,

if the output POE_12V short to GND test, will TPS23754 still have the HICCUP mode? because the IC will damage.

if can be improved, how to modify the schematic?

0116.TPS23754.pdf

  • +1
    TI__Mastermind 21320 points

    Hey Tommy,

    The hiccup mode should happen if the output is shorted. However, what can happen is there can be peak charging in the auxiliary winding of the transformer. Depending on the transformer, a resistor or RC filter may be required to deal with this peak charging. 

    This is covered in the datasheet in section: 8.2.2.7 Switching Transformer Considerations and RVC 

    I would measure the voltage on the VCC pin during this time to determine if there is a spike. 


    Additionally, what about the IC is damaging? Using the PoE PD Debug Guidelines, can you determine where in the board the damage is occuring?

    If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments