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LM3450

ACTIVE

LED drivers with active power factor correction and phase dimming decoder

Product details

Input voltage type AC/DC Topology Boost, Flyback Vin (min) (V) 85 Vin (max) (V) 20 Vout (max) (V) 60 Vout (min) (V) 9 Iout (max) (A) 2 Iq (typ) (mA) 1.6 Features Adjustable Switch Frequency, Enable/Shutdown, Thermal shutdown Operating temperature range (°C) -40 to 125 Dimming method Forward Phase (Triac), Reverse Phase Number of channels 1 Rating Catalog
Input voltage type AC/DC Topology Boost, Flyback Vin (min) (V) 85 Vin (max) (V) 20 Vout (max) (V) 60 Vout (min) (V) 9 Iout (max) (A) 2 Iq (typ) (mA) 1.6 Features Adjustable Switch Frequency, Enable/Shutdown, Thermal shutdown Operating temperature range (°C) -40 to 125 Dimming method Forward Phase (Triac), Reverse Phase Number of channels 1 Rating Catalog
TSSOP (PW) 16 32 mm² 5 x 6.4
  • Critical Conduction Mode PFC
  • Over-Voltage Protection
  • Feedback Short Circuit Protection
  • 70:1 PWM Decoded From Phase Dimmer
  • Analog Dimming
  • Programmable Dimming Range
  • Digital Angle and Dimmer Detection
  • Dynamic Holding Current
  • Smooth Dimming Transitions
  • Low Power Operation
  • Start-Up Pre-Regulator Bias
  • Precision Voltage Reference

All trademarks are the property of their respective owners.

  • Critical Conduction Mode PFC
  • Over-Voltage Protection
  • Feedback Short Circuit Protection
  • 70:1 PWM Decoded From Phase Dimmer
  • Analog Dimming
  • Programmable Dimming Range
  • Digital Angle and Dimmer Detection
  • Dynamic Holding Current
  • Smooth Dimming Transitions
  • Low Power Operation
  • Start-Up Pre-Regulator Bias
  • Precision Voltage Reference

All trademarks are the property of their respective owners.

The LM3450/50A is a power factor controller (PFC) with separate phase dimming decoder. The PFC regulates the output voltage while maintaining excellent power factor. The phase dimming decoder interprets the phase angle and remaps it to a 500Hz PWM output. This device is ideal for implementing a dimmable off-line LED driver for 10-100W loads.

The phase dimming decoder has several unique features. The input-output mapping is programmable for design flexibility, while a dynamic filter and variable sampling rate provide smooth uniform dimming. A dynamic hold circuit ensures that the phase dimmer angle is decoded properly while minimizing extra power loss.

The LM3450A is identical to the LM3450 with the exception of one circuit operation. The dynamic hold current is sampled in the LM3450 while it continuously operates in the LM3450A. This difference between the two devices defines the suitable applications for each. The following is a general guideline for choosing the correct device:

  • Any 120V designs with POUT > 15W - LM3450A
  • Any 230V designs with POUT > 25W - LM3450A
  • 120V 2-Stage designs with POUT < 15W - LM3450
  • 230V 2-Stage designs with POUT < 25W - LM3450

The LM3450/50A is a power factor controller (PFC) with separate phase dimming decoder. The PFC regulates the output voltage while maintaining excellent power factor. The phase dimming decoder interprets the phase angle and remaps it to a 500Hz PWM output. This device is ideal for implementing a dimmable off-line LED driver for 10-100W loads.

The phase dimming decoder has several unique features. The input-output mapping is programmable for design flexibility, while a dynamic filter and variable sampling rate provide smooth uniform dimming. A dynamic hold circuit ensures that the phase dimmer angle is decoded properly while minimizing extra power loss.

The LM3450A is identical to the LM3450 with the exception of one circuit operation. The dynamic hold current is sampled in the LM3450 while it continuously operates in the LM3450A. This difference between the two devices defines the suitable applications for each. The following is a general guideline for choosing the correct device:

  • Any 120V designs with POUT > 15W - LM3450A
  • Any 230V designs with POUT > 25W - LM3450A
  • 120V 2-Stage designs with POUT < 15W - LM3450
  • 230V 2-Stage designs with POUT < 25W - LM3450

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Technical documentation

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Type Title Date
* Data sheet LM3450/A LED Drivers with Active Power Factor Correction & Phase Dimming Decoder datasheet (Rev. D) 01 May 2013
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note AN-1656 Design Challenges of Switching LED Drivers (Rev. A) 03 May 2013
User guide AN-2098 LM3450 Evaluation Board (Rev. A) 03 May 2013
User guide AN-2150 LM3450A Evaluation Board (Rev. B) 03 May 2013
Application note LM3450_A Design Calculator Instructions 19 Apr 2012

Design & development

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

Evaluation board

LM3450AEV120V30 — LM3450A 120Vac 30W 2 Stage Dimmable LED Driver

The LM3450A evaluation board is designed to provide an AC to LED solution for a 30W LED load. Specifically, it takes an AC mains input and converts it to a constant current output of 700 mA for a series string of 1 to 13 LEDs (maximum LED stack voltage of 45V). There are two assembly versions (...)

User guide: PDF
Not available on TI.com
Evaluation board

LM3450AEV230V30 — LM3450A 230Vac 30W 2 Stage Dimmable LED Driver

The LM3450A evaluation board is designed to provide an AC to LED solution for a 30W LED load. Specifically, it takes an AC mains input and converts it to a constant current output of 700 mA for a series string of 1 to 13 LEDs (maximum LED stack voltage of 45V). There are two assembly versions (...)

User guide: PDF
Not available on TI.com
Calculation tool

SLUC351 LM3450_A Design Calculator

Supported products & hardware

Supported products & hardware

Products
Illumination LED drivers
LM3450 LED drivers with active power factor correction and phase dimming decoder
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Package Pins CAD symbols, footprints & 3D models
TSSOP (PW) 16 Ultra Librarian

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