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Why is UCC27200's HO always keep VDD ?

Hello

I use IC(UCC27200D), input signal(pin5 and pin6) is connected to LM5037(pin13 and pin12), IC power is 12V,  VDD capacitance is 1uF , HB to HS is connect 0.1uf ceramic capacitance, HO and LO is not connect anything. measurement LO is normal have pluse wave , but HO always keep 12V.

Why is HO keep 12V ?

Thanks