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LM3447 Datasheet Primary Side Power Regulated PFC Flyback Controller

Manufacturer: Texas Instruments

Overview: LM3447 www.ti.com SNOSC65 A – APRIL 2012 – REVISED MAY 2012 Phase Dimmable, Primary Side Power Regulated PFC Flyback Controller for LED Lighting Check for Samples:.

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General Description

The LM3447 is a versatile power factor correction (PFC) controller designed to meet the performance requirements of residential and commercial phase-cut dimmer compatible LED lamp drivers.

The device incorporates a phase decoder circuit and an adjustable hold current circuit to provide smooth, flicker free dimming operation.

A proprietary primary side control technique based on input voltage feedforward is used to regulate the input power drawn by the LED driver and to achieve line regulation over a wide range of input voltage.

Key Features

  • 1.
  • Integrated Phase Angle Decode.
  • Leading and Trailing Edge Compatible.
  • Over 50:1 Dimming Range.
  • Power Factor Correction with Low Total Harmonic Distortion.
  • Primary Side Control Using Input Voltage Feedforward Technique.
  • Input Power Regulation Scheme with Improved Line Regulation.
  • Constant Power Operation of LEDs to Compensate for Forward Voltage Variations Over Temperature and Lifetime.
  • Fixed Frequency Discontinuous Conduct.

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