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TPS65217C芯片的SYS电压



使用TPS65217C芯片来处理电源,参考BeagleBone Black电路,通过USB或者AC DC5V 供电,SYS的电压都只有0.49V.然而,在SYS端直接加DC5V电源以后,再次通过USB或者AC DC5V 供电,SYS的电压又变为DC5V,其他的电压如3.3V/1.8V/1.1V都正常。请问,这是什么原因?谢谢!