LT1103

Obsolete

Offline Switching Regulator

Data Sheet (Rev. F) Product Selection Table

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Overview

Obsolete: Datasheet For Information Purposes Only. Contact Analog Devices for Potential Replacement

±1% Line and Load Regulation with No Optocoupler
Switch Frequency Up to 200kHz
Internal 2A Switch and Current Sense (LT1103)
Internal 1A Totem-Pole Driver (LT1105)
Start-Up Mode Draws Only 200µA
Fully Protected Against Overloads

Overvoltage Lockout of Main Supply
Protected Against Underdrive or Overdrive to FET
Operates in Continuous or Discontinuous Mode
Ideal for Flyback and Forward Topologies
Isolated Flyback Mode Has Fully Floating Outputs

Obsolete: Datasheet For Information Purposes Only. Contact Analog Devices for Potential Replacement

The LT1103 Offline Switching Regulator is designed for high input voltage applications using an external FET switch whose source is driven by the open collect or output of the LT1103. The LT1103 is optimized for 15W to 100W applications. For higher power applications or additional switch current flexibility, the LT1105 is available and its totem pole output drives the gate of an external FET. Unique design of the LT1103/LT1105 eliminates the need for an optocoupler while still providing ±1% load and line regulation in a magnetic flux-sensed converter. This significantly simplifies the design of offline power supplies and reduces the number of components which must cross the isolation barrier to one, the transformer.

Applications

Up to 250W Isolated Mains Converter
Up to 50W Isolated Telecom Converter
Fully Isolated Multiple Outputs
Distributed Power Conversion Networks

Documentation

Data Sheet 1

LT1103/LT1105: Offline Switching Regulator Data Sheet (Rev.F) 03/12/2008

Reliability Data 1

R177 Reliability Data 03/23/2018

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
LT1725	PRODUCTION	General Purpose Isolated Flyback Controller

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LT1103

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.