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应用是这样的：单片机通过PWM信号控制恒流源芯片，可以通过PWM来调节占空比，实现电流变化。占空比是0-100。LED的工作电压电流是：电流为3A时电压4.5V，电流为2.5A时，电压4V。前端供电是18650锂电池，通过TPS61088升压到6V3A，输出18W，接到恒流源芯片上。要求恒流源芯片为降压型，输出电流最大可以到3A或者4A。单路输出即可。谢谢
