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UCC28730: 无法稳定谷底开通

Part Number: UCC28730

Hi

这边在用UCC28730调试一款反激电源 目前测试下来 发现变换器无法稳定谷底开通

下图为带载2W时的Vds_MOS的波形

想麻烦问一下 有哪些方面会影响芯片谷底开通的功能 从哪些方面去整改可以保证变换器一直在谷底开通(还是说变换器有时不在谷底开通也是正常的?)

谢谢!