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reference designLT3799

Analog Devices LT3799

Offline Isolated Flyback LED Controller with Active PFC

Overview

TopologyFlyback Converter
Input voltage90-150 V
Switching frequency25-300 kHz
Output 114 V / 1 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

Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
VIN
VOut1(V)
IOut1(A)
Vaux(V)
RDC 1(Ω)
RDC 2(Ω)
RDC 3(Ω)
fswitch(kHz)
L(µH)
NPRI : NSEC : NAUX
ISAT(A)
VT(V (AC))
L(mm)
W(mm)
H(mm)
Mount
Size
SamplesAvailability & Sample
750813134
SPECWE-OLLT Offline Flyback Transformers, 90 - 265 V (AC), 14 V
Simu­lation
Availability
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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-OLLT Offline Flyback Transformers
Input Voltage 90 - 265 V (AC)
Output Voltage 114 V
Output Current 11 A
Auxiliary Voltage18 V
DC Resistance 11.85 Ω
DC Resistance 20.06 Ω
DC Resistance 31.35 Ω
Switching Frequency 100
Inductance600 µH
Turns Ratio8:1:1.29 
Saturation Current1.75 A
Insulation Test Voltage4500 V (AC)
Length18 mm
Width16.5 mm
Height18 mm
MountTHT 
SizeEE16/7/5 
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