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LM3424 DIM引脚通过PWM调光接线

Other Parts Discussed in Thread: LM3424

请问:
    LM3424 DIM引脚通过PWM调光接线

   PWM信号是直接 接入nDIM引脚,还是接入到R4电阻的左边 (如下图)

   还是说当接入PWM信号后,就不需要R4电阻了。PWM信号可以直接 接入nDIM引脚。

   麻烦协助。

   此处PWM应该是电压型的吧。