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請問這顆IC他說他使用PSR技術
還有soft switching
有人知道他的soft switching是使用哪種技術嗎?我看不出來
PSR: Primary-Side Regulation原边调制。输出电压的恒压恒流不是通过采样副边经过光耦传到原边PWM controller（UCC28700）SENSE脚而是通过增加一个辅助绕组来检测的。建议发到电源管理的版块得到更加准确的回答。
soft switching技术Quasi-resonant valley switching说的就是，Vallay Switching相当于谷底开关，所以是可能减少开通损耗
