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请有经验的大师指点一下TPS54360电源的几个问题。

Other Parts Discussed in Thread: TPS54360

电源IC:TPS54360,输入电压28-45V,输出电压4.9V,电流输出3A以内。现在有如下几个问题百思不得其解。

1:设计的电路能够工作,但是在2A的时候效率只有75%。同时电感发热很大,手指放上去感觉到烫手,芯片也有热量。

2:对COMP补偿的电路取值的计算没搞明白,下载是按照WEBENCH来测试的。

3:输出4.9V随着电流的增大,输出电压也会降低,电流到2A时,电压只有4.3V。