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led恒流限流

Other Parts Discussed in Thread: TPS61165

用恒流电源驱动大功率led,正常情况下通过限流对led供能,当来一个脉冲时,输出最大电流,使用同一电源,通过mos怎么实现限流尼,不想使用在mos管源极串一个电阻的方案,求解答