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变压器 啸叫

Other Parts Discussed in Thread: UCC28950

我参照ucc28950 评估板 做了个1000W的DCDC 现在的问题是 在满功率情况下 变压器出现啸叫 而且频率很高 声音很大

请问是什么原因 ?

有分析说 电压反馈 参数不匹配产生震荡造成的  还是变压器的原因