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Dimming LEDs with a Conventional Triac Wall Dimmer: Solutions and Design Tips[There were 32 comments from experts]
  Q:what's the difference between using LM3445 and using MCU PWM Part to control the LEDs?
  A:The main advantage of using LM3445 over a MCU is the source and sink current is as high as 0.8A whereas of a MCU will hardly be <100mA. And also The Angle Detector/Decoder feature of LM3445 Enables full range (0-100%) dim capability