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LM5171: 空载功耗大,以及其他设置问题

Part Number: LM5171

1、系统空载时功耗达到29W,LV端输入电压19.2V电流达到1.5A。此时HV端输出电压49.6V,电感发热严重。MOS管无发热情况,这样的情况应该往哪个方向排查?下图是上下管的开关波形,死区时间设置200ns:

从以上波形看,在空载的情况下,开关波形还是比较好的。

2、如何调节boost时HV端的电压,buck时LV端的输出电压?