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UC2844: 反激式开关电源非主反馈副边输出短路为什么会打嗝?

Part Number: UC2844

2844搭建的反激式开关电源,有一路副边输出是非主反馈支路,但是为什么这条支路短路的时候开关电源会打嗝,其详细过程是什么样的?涉及变压器内部之间各绕组的耦合关系以及2844的处理逻辑,打嗝的声音是变压器发出来的吗?