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反激輸出加LC濾波器，雖然采樣更精準，但是會在環路上加了一個雙極點。設計上，這個雙極點頻率最好是轉折頻率fc的5倍以上。4.7uH、820μH很明顯在轉折頻率附近，影響了相位裕度，導致系統震蕩。一般減小電容容值效果會更好，ESR零點頻率也會上升

08-28 14:26 回復

原帖：關于反激輸出第二級LC濾波影響環路穩定性問題

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