LM3447
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.
Key Features
- 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 Conduction Mode Operation
- Valley Switching Operation to Achieve High Efficiency and Low EMI
- Efficient TRIAC Hold Current Management
- Thermal Foldback Function for LED Protection
- LED Open Circuit and Short Circuit Protection
