Top

Product details

Parameters

Input voltage (type) AC/DC Vin (Min) (V) 7.5 Vin (Max) (V) 17.5 Iout (Max) (A) 2 Vout (Min) (V) 9 Vout (Max) (V) 60 Regulated outputs (#) 1 Topology Flyback Dimming method Forward Phase (Triac), Reverse Phase Power factor correction (Min) Active Features Adjustable Switch Frequency, Soft Switching, Thermal Shutdown Operating temperature range (C) -40 to 125 Switching frequency (Min) (kHz) 60 Switching frequency (Max) (kHz) 120 Iq (Typ) (mA) 1.6 Vref (V) 1 open-in-new Find other General lighting LED drivers

Package | Pins | Size

TSSOP (PW) 14 32 mm² 5 x 6.4 open-in-new Find other General lighting LED drivers

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
open-in-new Find other General lighting LED drivers

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. 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.

open-in-new Find other General lighting LED drivers
Download

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 9
Type Title Date
* Datasheet LM3447 Phase Dim, Primary Side PFC Flyback Controller for LED Lighting datasheet (Rev. A) May 17, 2012
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical articles Here's how body electronics and lighting technology are changing the driving experience Sep. 26, 2016
Technical articles LED brightness adjustment: high-frequency PWM dimming Aug. 26, 2016
Technical articles Take better selfies with innovative LED flashes Nov. 18, 2014
Technical articles Solving the automotive EMI issues in new cars with all the screens Sep. 10, 2014
User guides Using the LM3447-PAR-230VEVM Aug. 07, 2012
User guides Using the LM3447-A19-230VEVM Jun. 07, 2012
User guides Using the LM3447-A19-120VEVM Apr. 18, 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
99
Description
The Texas Instruments LM3447-A19-120VEVM evaluation module (EVM) helps designers evaluate the performance of the LM3447 PFC Flyback Controller for LED Lighting. The EVM is a primary-side power regulated PFC controller used for commercial and residential phase-cut dimmer compatible LED lamp drivers (...)
Features
  • Primary-Side Control
  • Leading and Trailing Edge Compatible
  • 50:1 Dimming Range
  • Valley Switching
  • Fixed Frequency Discontinuous Operation
  • Thermal Foldback
  • PFC
  • Efficient Triac Hold Current Operation
  • LED Short and Open Circuit Detection
  • Thermal Foldback
  • Constant Power Operation
EVALUATION BOARDS Download
document-generic User guide
99
Description
The Texas Instruments LM3447-A19-230VEVM evaluation module (EVM) helps designers evaluate the performance of the LM3447 PFC Flyback Controller for LED Lighting. The EVM is a primary-side power regulated PFC controller used for commercial and residential phase-cut dimmer compatible LED lamp drivers (...)
Features
  • Primary-Side Control
  • Leading and Trailing Edge Compatible
  • 50:1 Dimming Range
  • Valley Switching
  • Fixed Frequency Discontinuous Operation
  • Thermal Foldback
  • PFC
  • Efficient Triac Hold Current Operation
  • LED Short and Open Circuit Detection
  • Thermal Foldback
  • Constant Power Operation
EVALUATION BOARDS Download
document-generic User guide
99
Description

Evaluation Module/Board for LM3447 PFC Flyback Controller for LED Lighting

The Texas Instruments LM3447-PAR-230VEVM evaluation module (EVM) helps designers evaluate the performance of the LM3447 PFC Flyback Controller for LED Lighting. The EVM is a primary-side power regulated PFC controller used for (...)
Features
  • 230VAC Isolated Triac Dimmable LED Driver
  • Triac Dimmable

Design tools & simulation

SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
CALCULATION TOOLS Download
LM3447 Design Spreadsheet
LM3447DESIGN-CALC 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) LED (...)
CALCULATION TOOLS Download
SLUC365.ZIP (131 KB)

Reference designs

REFERENCE DESIGNS Download
LM3447 - 230VAC, 10W, Phase Dimmable Non-isolated Buck-Boost PFC LED Driver
PMP8025 The main purpose of this reference design is to demonstrate a high performance offline phase dimmable Buck-Boost PFC LED driver based on LM3447. This LED driver is designed for converting an AC input to a regulated LED current.

The operating conditions and performance of the reference design are as (...)


REFERENCE DESIGNS Download
High PF dimmable GU10 LED driver solution
PMP4339 — This design demonstrates high PF dimmable GU10 LED driver solution using primary side sensing controller LM3447. High PF>0.9 is achieved in the design and the board is capable of collaborate with broad triac dimmers. The design passed EMI test w/o Y cap and is limited in compact size (...)
REFERENCE DESIGNS Download
Isolated LED Driver with PFC for A19 Lamp Application using LM3447 - 230VAC, 36VLED 12W
PMP8013 — The main purpose of this reference design is to demonstrate the LM3447 is ideal for implementing high dimmable performance with single stage PFC, isolated LED lamp drivers where simplicity, low-component count and small solution size. The operating conditions and performance of the reference design (...)

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 14 View options

Ordering & quality

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos

Related videos