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LM5118调试问题

Other Parts Discussed in Thread: LM5118

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?