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UCC28700满载工作时是不是跳频状态？就是两种频率切换工作？
UCC28700在重载的时候，工作在调频状态，频率随负载变化而变化。
如果输入输出条件不变，频率在跳动，说明电路发生了次谐波震荡。需要调整电路参数。
负载不变呢？频率是不是基本固定的？
