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UC3875 移相角调节范围有限如何解决???

Other Parts Discussed in Thread: UC3875

您好,我用了贵公司的UC3875作移相调功芯片,现发现移相角调节范围只在0`20度范围内连续可调,而芯片资料上说可在0~180度范围内连续可调,不知道什么原因,请指点,谢谢O(∩_∩)O