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UCC3895做的移相全桥拓扑，轻载时超前臂OUTC、OUTD两路脉宽抖动不稳，导致输出噪音很大，望TI工程师指点。
亲；如何不稳？建议传个原理及波形看看。
轻载时超前臂移相抖动，实际脉宽时有时无。
UCC3895移相角不能调节至最大导致有效脉宽不能调到最小
