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Original question:

UCC24630 / the high current on primary-side FET.

UCC24636: Start up burning MOS DS level

Gabriel Wang1
Genius 4185 points
Part Number: UCC24636

Dear Expert

My customer start up synchronous rectifier  burning MOS DS Pin . This kind of failure phenomenon has about 4 sets, a total batch 500 sets.

Below is schemeitc :

Could you give any suggestion how we locate where the problem is ？

  • 0
    TI__Expert 7080 points

    Hi Gabriel,

    Could you please give more details description and share more information. such as:

    1. What the primary side controller part number.  

    2. what the input voltage and output voltage /load when failure happened. looks like there is PFC at front stage , what is bulk voltage ?

    3. What the transformer Lm . turns ratio , and what the SR FET P/N

    4. Did you captured any waveforms when the failure happens , it should including primary FET Vds , SR FET Vds and Vgs , It's more better have transformer primary winding current.

    Thanks.