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LM3409: 输入电压变化的时候,不能恒流输出

Part Number: LM3409

现在设计一个LED驱动电路,输入6-12V,输出电压3.3V 输出电流3.5A。

输入12V的时候,测量出来电流为3.5A左右。电源切换到6V,电流就变成3.2A左右。可能是哪里的原因导致的呢?