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求推荐LED驱动芯片，降压恒流源芯片，PWM控制电流大小；18V输入，PWM控制电流大小，最大工作电流1.3A，此时对应的最大输出电压在3.5V左右
可以看一下我们的LM3414。
LM3414非常适合你
从性价比的角度，TPS92512更适合你。
