LM3447 Description
The LM3447 is a versatile power factor correction (PFC) controller designed to meet the performance requirements of residential and mercial phase-cut dimmer patible 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...
LM3447 Key Features
- Integrated Phase Angle Decode
- Leading and Trailing Edge patible
- 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 pensate for Forward Voltage Variations Over Temperature and Lifetime
- Fixed Frequency Discontinuous Conduction Mode Operation
- Valley Switching Operation to Achieve High Efficiency and Low EMI
- Efficient TRIAC Hold Current Management