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LM5017工作频率---Ti专家及各路高手帮忙看看

Other Parts Discussed in Thread: LM5017

之前有发帖讲LM5017的输出波形问题一直没有得到解决。输入24-76V,输出分别为5V和15V,如果不看SW的输出波形输出还是很稳的,可是一看SW的波形,频率不是我设计的频率,总是有调节震荡。调整反馈电阻的阻值(等比例缩小)会有改善,但是15V的频率还是太高,而且会有震荡,请专家帮忙看看,到底是哪里的问题,附上电路图和波形如附件。