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uc3825,两个pwm输出不对称,当占空比小于10%左右时

Other Parts Discussed in Thread: UC3825

我现在做一个半桥电路用到uc3825,发现在占空比很小时,大约小于10%,两个pwm输出不对称,如下图所示

我基本上把外部电路都撤了也是这个样。这是什么问题,以前有没有人遇见过。

求帮助!