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LM5035 半桥控制器不工作

Other Parts Discussed in Thread: LM5035, TL431

LM5035 半桥控制器不工作,图示按规格书pdf画的

输入是24vdc,输入电流28ma,芯片微热

VIN脚电压是23.5v

REF脚无电压(无短路现象),检查了UVLO脚为1.57v,OVP脚位0.25v,

芯片中间的脚也焊接了

就想不出查哪了?郁闷啊!