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LM5116: LM5116使用官方推荐的升负压方案,无法成功

Part Number: LM5116

LM5116使用官方推荐的升负压方案,无法成功,且芯片的VCC与输出端之间电压为-12V(GND符号),VCC对公共端的电压输出为6.9V(负端),上下两个N管的Vgs电压为4.5V(MOS管型号sqm90142e)。求指教