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c3454是一种同步降压-升压型dc/dc转换器，为用单节锂离子电池输入以高达1A的电流驱动单个大功率led而优化。该器件视vin与led正向电压之间关系的不同，自动在同步降压、同
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画在led的vf曲线图上，两条曲线的交点是各个led的调节点。图4. 白色led通常有四种不同的驱动电路：(A) 电压源与镇流电阻, (b) 电流源与镇流电阻, (c) 多路电流
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