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c6678 power

yong zhang3
Prodigy 140 points
Other Parts Discussed in Thread: LM27402, CSD87351Q5D, LM10011

HI,my dear Engineers，I come cross a queston.

1,I use a power paln that is LM27402+CSD87351Q5D+LM10011,I find that it can achieve 12v to 1v,but it's output voltage contain High-frequency oscillation,the FB of LM27402 also have  High-frequency oscillation.LM27402 is very hot,this is Schematicsand  output  waveform.