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LM3409: LM3409模拟量控制可以实现,现在遇到一个最小输出电流的问题

Part Number: LM3409

"使用LM3409模拟接口配置0V或者140mV情况下输出电流无法到达0mA,模拟量接口接地情况下输出电流最小为20mA,想请教以下改变哪个配置可以调整这个输出电流",之前模拟量控制不了的时候把coff的电容从330pf增加到560pf就可以了