最近用LM5118做一个DCDC，输入24V~72V，输出36V，2A，电路图按照TI设计。调试时候（只焊接了M1，未焊接M2）输入55V，输出只有6.8V，此时测量1脚电压55V，2脚电压3.4V，4脚电压50V，5脚电压下图示波器所示，测得HO脚电压恒定为6.8V，LO脚电压恒为7.2V，请问这是什么原因？
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