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LM3409: LM3409输出电流不稳定的问题

Part Number: LM3409

 LM3409的原理图如上,现在实际外部MOS管调光时,CS引脚的电压一直在缓慢上升,0V~60mv,始终无法达到0.2V,

负载为3V,2.5A,外置的PWM波形正常,EN脚一直是3.3V,请教下是什么原因,有没有什么思路