This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM51551-Q1: flyback SW waveform has drop when start up

Part Number: LM51551-Q1

Tool/software:

Dears:

Customer found LM51551-Q1 SW drop after 6ms start up with no loading, it has two drop , around 160uS, 

add some loading this abnormal drop is removed.

Could you please help check if this drop is normal behavior of this part when use in flyback ? Thanks.