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UCD3138HSFBEVM-029 评估模块加电,没有输出电压?

在加输入电压48V前,S1开关状态处于off,输入48V,D14指示灯亮,Vin_OK指示灯D13不亮,S1处于ON,没有输出电压,全桥场管没有驱动,辅助电源VAUXS11V,6V_UR只有5.6V ,测试是空载测试。请问这是哪一部分故障,为什么没有输出电压