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求助关于LM5175 频率设置的问题

Other Parts Discussed in Thread: LM5175

现在碰到一个问题,一直没有明白为什么,我按LM5175的规格书设定,RT=84.5K,但是测到的MOS的开关频率只有152K,明显只是理论值的一半,这是为什么。改了很久都没有找到原因。

请求帮助,搞了好久了,没有人遇到类似的问题吗?