Part Number : LM3447
Function : Phase Dimmable, Primary Side Power Regulated PFC Flyback Controller for LED Lighting
Package : TSSOP 14-pin
Manufacturers : Texas Instruments
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.
Valley switching operation is implemented to minimize switching loss and reduce EMI. An internal thermal foldback circuit is provided to protects the LEDs from damage based on the temperature sensed by a single external NTC resistor. Additional features include LED open circuit and short circuit protection, cycle-by-cycle FET over-current protection, burst mode fault operation using an internal 812ms fault timer and internal thermal shutdown.
Official Site : http://www.ti.com/product/lm3447
LM3447 Datasheet PDF Download
Other data sheets within the file : LM3447MT, LM3447MTE, LM3447MTX