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关于LM3429没有电流输出问题

HI,

  目前做的升降压电路,电压输出很正常,sense电阻(0.1欧)两侧有0.1V电压,但是电流特别小,gate电压很低。VCC电压6.9V,RCT端电压不稳定有1.2V左右,波动i较大,OVP引脚0.5V,NPWM引脚2.2V左右,IS 上电压22MV,基本没电压。目前不清楚哪里问题,请友人回答,谢谢!