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LM5155-Q1: LM5155 VCC

Part Number: LM5155-Q1

While I use 5155 LDO as vcc, the voltage is 6.85V. it works well,

I want to use higher voltage as mosfet driver, so I link VCC to VBIAS, then gate pin output waveform is wrong, so what should I do if I want to get higher gate voltage