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UCC28782: At 100Vdc input, the VDD gets 18V from the secondary winding, but the switch tube does not get PWM signal

peiji huang
Part Number: UCC28782


  •  The design objective  :input：90-265V，output:0-6A,20V
  • When the circuit works at 325VDC input and output 0-6A, the circuit normally outputs 20V and the simulation of the circuit is normal.

  • At 100Vdc input, When it operates at 10mA, the circuit works normally.But when it operate from 10mA to 3A,the circuit fails.The graph is follow: