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TPS23754 芯片、MOS、变压器发烫严重,占空比跳变求助高手

Other Parts Discussed in Thread: TPS23754

最近仿照TPS23754EVM-383EVM做了一个符合802.3at的PD设备,输出电压19V,变压器用的是线艺的POE300F-24L,输入电压范围44V-57V,占空比理论范围是50%——65%,输出电压19V正常,但是TPS23754 芯片、高压侧的NMOS和PMOS、变压器发烫严重,而且工作一段时间后占空比还会跳变,求高手分析原因。

tps23754 POE.PDF