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LM5020-1开关频率减半

用LM5020-1设计的反激变换器多路输出,输入+12V - -12V,隔离变压器,3路输出 380V,27V,7.5V。7.5V为主输出,光耦隔离反馈3脚COMP。开关频率设定在50KHz。

现在当负载轻时,开关频率为25KHz,负载加重后开关频率为50KHz。

麻烦各位大神帮小弟分析下为什么会这样啊

谢谢!

MD-6KW-1.pdf