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输出端有锯齿波

Other Parts Discussed in Thread: UCC28740, TL431
 您们好!我用UCC28740控制芯片开发了一套输出20V/2A反激式电源;
原理图如附件
20V输出端有锯齿波
输出端怎么才能变为直线上面可以有毛刺?
您们帮我分析下。
加大电容没有用。