IC manufacturers Analog Devices

IC manufacturers (99)

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 1125 V / 0.32 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

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

Products

Order Code Data­sheet Simu­lation Downloads Status Product seriesVINVOut1
(V)
IOut1
(mA)
Vaux
(V)
RDC 1
(Ω)
RDC 2
(Ω)
RDC 3
(Ω)
fswitch
(kHz)
L
(µH)
NPRI : NSEC : NAUXISAT
(A)
VT
(V (AC))
L
(mm)
W
(mm)
H
(mm)
MountSize Samples
750811290SPEC
8 files Active i| Production is active. Expected lifetime: >10 years.WE-OLLT Offline Flyback Transformers 85 - 265 V (AC) 125 360 21.25 0.6 0.254 0.11 150 461 1:1:0.17 3.15 4500 31 31 25 THT ER28/14
Order Code Data­sheet Simu­lation
750811290SPEC
Samples
Order Code Data­sheet Simu­lation Downloads Status Product seriesVINVOut1
(V)
IOut1
(mA)
Vaux
(V)
RDC 1
(Ω)
RDC 2
(Ω)
RDC 3
(Ω)
fswitch
(kHz)
L
(µH)
NPRI : NSEC : NAUXISAT
(A)
VT
(V (AC))
L
(mm)
W
(mm)
H
(mm)
MountSize Samples