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LM51551: LM51551 - Discontinuous outputs

Part Number: LM51551

Hi , 

I am using LM51551 in my project application. 

Under the conditions mentioned below, I am observing that the outputs are discontinuous (Image attached below). Please explain this behavior.

Input : INH = 13.5V ; V_supply = 20V @ 1V/300ms slope

At the output, I have applied a load of 80mA for 8V output and 430mA for 15V output.

  • Hello Anne, 

    Thanks for reaching out. Could you please share the schematics and the specs of your design (Vin, Vout, Iout max, switching frequency)? Can you please check the correct orientation of the transformer and the rectifier diodes? Is there any condition when this behavior is not seen (e.g. in no load)? Can you please share as well the waveform of the switch node and FB pin? 

    Kind regards,