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做一个LED驱动

Other Parts Discussed in Thread: LM3421, LM3466, LM3414

LED正向电压典型值 35VDC 最大值 42VDC 电流 900mA  ,输入电压12VDC,想用PWM控制亮度也就是控制电流输出,请问有什么合适的方案吗?PWM峰峰值5V