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.
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. This device is currently available in a TSSOP 14-pin package.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM3447 Phase Dim, Primary Side PFC Flyback Controller for LED Lighting datasheet (Rev. A) | 17 May 2012 | |
| White paper | Common LED Functions and LED Driver Design Considerations | 21 Sep 2020 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| User guide | Using the LM3447-PAR-230VEVM | 07 Aug 2012 | ||
| EVM User's guide | Using the LM3447-A19-230VEVM | 07 Jun 2012 | ||
| EVM User's guide | Using the LM3447-A19-120VEVM | 18 Apr 2012 |
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The LM3447 Design Calculator is an Excel based design tool to aid in determining external component values for the the LM3447 Offline, Phase Dimmable, Primary Side Power Regulated, PFC Flyback Controller. The LM3447 AC/DC LED driver is intended for use in phase dimmable (TRIAC and trailing-edge) (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| TSSOP (PW) | 14 | Ultra Librarian |
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