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TPS64200 电路芯片电压降不下来,芯片发烫厉害



参考官方图,制作了一块电源DCDC,4节电池供电,希望降压到3.3V,结果现在进入6V电压,出来6.5V电压,而且芯片发烫十分严重,请问是什么问题?

二极管用的B320,电感用的CD54  10uH,PMOS用的SI2301,电路图如下图所示

官方例子如下: