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TPS43060: 12V5A升压26V2A,45W输出时芯片和mos管温度过高

Part Number: TPS43060
Other Parts Discussed in Thread: LM5148

我使用12V5A供电,使用TPS43060升压至26V,再使用LM5148降压,实现12V转5~24V可调输出,原理图如下

            

TPS43060和LM5148输出电压均正常,开关频率TPS43060-500kHz, LM5148-500kHz

空载时TPS43060温度在45℃,LM5148温度30℃;

输出12V,施加45W负载时,TPS43060和上下mos管(M1, M2)温度最高90℃,LM5148和上下mos管(M3, M4)温度最高60℃。

请问TPS43060的异常发热该怎么解决