Texas Instruments LM3447
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. The LM3447 is ideal for implementing dimmable, isolated single stage LED lamp drivers where simplicity, low-component count and small solution size are of primary importance.| Part No. | LM3447 |
|---|---|
| Datasheet | LM3447 Download |
| Manufacturer |  Texas Instruments |
| Description | Primary Side Power Regulated PFC Flyback Controller |
| Buy | Stock & Price |
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 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
APPLICATIONS
● Dimmable A19, R20, PAR30/38 LED Lamps● Recessed LED Downlights and Pendant Lights
● Industrial and Commercial Solid State Lighting
DESCRIPTION
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.
