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reference designLT3799

Analog Devices LT3799

Offline Isolated Flyback LED Controller with Active PFC

Overview

TopologyFlyback Converter
Input voltage90-265 V
Switching frequency25-300 kHz
Output 148 V / 1.4 A
IC revisionA

Description

The LT3799 is an isolated flyback controller with power factor correction specifically designed for driving LEDs. The controller operates using critical conduction mode allowing the use of a small transformer. Using a novel current sensing scheme, the controller is able to deliver a well regulated current to the secondary side without using an opto-coupler. A strong gate driver is included to drive an external high voltage MOSFET. Utilizing an onboard multiplier, the LT3799 typically achieves power factors of 0.97. The FAULT pin provides notification of open and short LED conditions.

The LT3799 uses a micropower hysteretic start-up to efficiently operate at offline input voltages, with a third winding to provide power to the part. An internal LDO provides a well regulated supply for the part’s internal circuitry and gate driver.

Features

  • Isolated PFC LED Driver with Minimum Number of External Components
  • TRIAC Dimmable
  • VIN and VOUT Limited Only by External Components
  • Active Power Factor Correction (Typical PFC > 0.97)
  • Low Harmonic Content
  • No Opto-Coupler Required
  • Accurate Regulated LED Current (±5% Typical)
  • Open LED and Shorted LED Protection
  • Thermally Enhanced 16-lead MSOP Package
  • Isolated PFC LED Driver with Minimum Number of External Components
  • TRIAC Dimmable
  • VIN and VOUT Limited Only by External Components
  • Active Power Factor Correction (Typical PFC > 0.97)
  • Low Harmonic Content
  • No Opto-Coupler Required
  • Accurate Regulated LED Current (±5% Typical)
  • Open LED and Shorted LED Protection
  • Thermally Enhanced 16-lead MSOP Package

Typical applications

  • Offline 4W to 100W+ LED Applications
  • High DC VIN LED Applications

More information

Products

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SamplesAvailability & Sample
744823220
SPECWE-CMB Common Mode Power Line Choke, 1.5 A, 20 mH
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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-CMB Common Mode Power Line Choke
Rated Current1.5 A
Inductance20 mH
DC Resistance270 mΩ
Rated Voltage250 V (AC)
Insulation Test Voltage1500 V (AC)
MaterialMnZn 
Length23 mm
Width13.8 mm
Height25.5 mm
MountTHT 
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750811353
SPECOffline Transformer, –, –
Simu­lation–
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Status Activei| Production is active. Expected lifetime: >10 years.
Product series Offline Transformer
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