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reference designLT3798

Analog Devices LT3798

Isolated No Opto-Coupler Flyback Controller with Active PFC

Overview

TopologyFlyback Converter
Input voltage10-38 V
Switching frequency0.5-150 kHz
Output 114 V / 1 A
Output 228 V / 0.5 A
IC revisionA

Description

The LT®3798 is a constant-voltage/constant-current isolated flyback controller that combines active power factor correction (PFC) with no opto-coupler required for output voltage feedback into a single-stage converter. A LT3798 based design can achieve a power factor of greater than 0.97 by actively modulating the input current, allowing compliance with most Harmonic Current Emission requirements.

The LT3798 is well suited for a wide variety of off-line applications. The input range can be scaled up or down, depending mainly on the choice of external components. Efficiencies higher than 86% can be achieved with output power levels up to 100W. In addition, the LT3798 can easily be designed into high DC input applications.

Features

  • Isolated PFC Flyback with Minimum Number of External Components
  • VIN and VOUT Limited Only by External Components
  • Active Power Factor Correction
  • Low Harmonic Distortion
  • No Opto-Coupler Required
  • Constant-Current and Constant-Voltage Regulation
  • Accurate Regulated Voltage and Current (±5% Typical)
  • Energy Star Compliant (<0.5W No Load Operation)
  • Thermally Enhanced 16-lead MSOP Package

Remarks:-Refer page 14Table 1. Predesigned Transformers-Typical Specification,Unless Otherwise Noted

Typical applications

  • High DC VIN Isolated Applications
  • Offline Bus Converter (12V, 24V or 48V Outputs)
  • Offline 5W to 100W+ Applications

More information

Products

Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
VIN
VOut1(V)
IOut1(mA)
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
750813144
SPECWE-OLLT Offline Flyback Transformers, 85 - 265 V (AC), 28 V
Simu­lation
Availability
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Downloads8 files

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CAD files ZIP

Electric models ZIP

Download all 8 files as zip archive
ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-OLLT Offline Flyback Transformers
Input Voltage 85 - 265 V (AC)
Output Voltage 128 V
Output Current 1500 mA
Auxiliary Voltage20 V
DC Resistance 12.4 Ω
DC Resistance 20.241 Ω
DC Resistance 31.55 Ω
Switching Frequency 100
Inductance600 µH
Turns Ratio4:1:0.71 
Saturation Current1.75 A
Insulation Test Voltage4500 V (AC)
Length18.5 mm
Width16.5 mm
Height18.8 mm
MountTHT 
SizeEE16/7/5 
–Check availability
750813134
SPECWE-OLLT Offline Flyback Transformers, 90 - 265 V (AC), 14 V
Simu­lation
Availability
–
Downloads8 files

EDA models: Components ZIP

CAD files ZIP

Electric models ZIP

Download all 8 files as zip archive
ZIP

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 11000 mA
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 
–Check availability