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TPS40210升压电路问题

Other Parts Discussed in Thread: TPS40210

网友 huanle1030在21ic 电源技术 论坛问以下问题:

http://bbs.21ic.com/icview-619225-1-1.html

我用的是TPS40210,根据datasheet上的推介电路,可是mos负载一加上去mos就发烫,1A就很烫,我需要能做到1.5A以上,请问是mos有问题?能否推介个mos,并指点一二,谢谢!

工作条件: 输入9V,输出16.8V/3A,现在用的mos是si4840,但是到1A的时候mos就烫的比较厉害,有什么好的方法解决吗