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UC3842A: UC3842AD8TR review schematic

Part Number: UC3842A
Other Parts Discussed in Thread: AM26C31, UC3842


our client design UC3842AD8TR, we need double confirm schematic as  P5 point connect to AM26C31 Vcc Pin16, it's could be okay?

If any suggestion, Please advise me.


Best regards,


  • Hi Lawrence,

    Thank you for your question, and I am working on it.

    Best Regards
  • Hi Lawrence,

    It is OK to use UC3842 output voltage as the supply voltage of AM26C31. But you must note the specifications of AM26C31. Its maximum supply voltage is -0.5~7V, and it is recommended to operate under 4.5~5.5V supply voltage. So I suggest that you'd better to test the voltage of P5 in advance before connect it to Vcc Pin of AM26C31, though I think it could be realized within allowable range easily as P5 voltage is as the loop feedback control voltage in your circuit.
    By the way, I suggest that place a low-ESR, 0.1uF ceramic bypass capacitor between Vcc and ground of AM26C31 to reduce the coupled noise, and placed as close to the device as possible.