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TPS43061 做的方案MOSFET温度过高问题

Other Parts Discussed in Thread: TPS43061

各位大神好! 本人用TPS43061做了一个 输入DC10~18V,输出DC 25.4V/4A 的方案,现在问题是下管温升严重,达到110摄氏度,请问是否我的参数有问题,还是本身这方案不能做到这样的功率,附件原理图

Schematic Prints.pdf