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UC2845: Help check the schematic

Star Xu
Genius 9645 points
Part Number: UC2845

Hi

Please help check the attached schematic.

Measure the gate pin voltage waveform of Q40, the voltage >30V chip no output.

Waiting for your reply.

Thanks

Star

  • 0
    TI__Mastermind 31580 points
    HI Star

    What are the voltage waveforms on the gate drive pin 16, the Vref pin 9 and Vsense pin.

    What is the input voltage on the AC line? The oscilloscope picture shows a waveform, is that the gate drive when the input voltage is less than 30V?

    Thanks

    Peter