IC reference design search
IC manufacturers Analog Devices

IC manufacturers (103)

reference designLT3798

Analog Devices LT3798

Isolated No Opto-Coupler Flyback Controller with Active PFC

Overview

TopologyFlyback Converter
Input voltage90-265 V
Switching frequency0.5-150 kHz
Output 124 V / 1 A
Output 224 V / 2 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
Downloads
Status
Product series
L(µH)
IR(A)
RDC max.(Ω)
SamplesAvailability & Sample
7447018
SPECWE-FI Leaded Toroidal Line Choke, 150 µH, 2.5 A
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-FI Leaded Toroidal Line Choke
Inductance150 µH
Rated Current2.5 A
DC Resistance0.1 Ω
–Check availability
750811399
SPECOffline Transformer, –, –
Availability
–
Downloads–
Status Activei| Production is active. Expected lifetime: >10 years.
Product series Offline Transformer
–
–
–
–Check availability