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你好，我最近在用ucc28950做一个移相全桥DCDC转换器，我在实验时发现空载或轻载时我的反馈电压使EA-等于EA+使就会使变压器发出响声。这时输出波形会特别混乱，因为不知道问题在哪，也就没有加大输出功率。我的电路图下图所示：
