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LM5121升压电路不工作,输出与输入电压接近,请大神帮忙看下,谢谢

Other Parts Discussed in Thread: LM5121

我们用的一个LM5121的升压电路,输出电压和输入电压差不多,没有升压,电路见下

用示波器量Q4002,Q4003上的门极,Q4002一直是打开的,Q4003一直是关闭的,开关电路没有工作

不过用于UVLO的Q4001可以正常通断,LM5121的VCC也有7点几伏

请大神帮忙看下,谢谢