LT1105

PRODUCTION

Offline Switching Regulator

Data Sheet (Rev. F) Product Selection Table
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Overview

  • ±1% Line and Load Regulation with No Optocoupler
  • Switch Frequency Up to 200kHz
  • 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

The LT1105 Offline Switching Regulator is designed for high input voltage applications using an external FET switch. The LT1105 is available and its totem pole output drives the gate of an external FET. Unique design of the 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.

The LT1105 current mode switching techniques are well suited to transformer isolated flyback and forward topologies while providing ease of frequency compensation with a minimum of external components.

APPLICATIONS

  • Up to 250W Isolated Mains Converter
  • Up to 50W Isolated Telecom Converter
  • Fully Isolated Multiple Outputs
  • Distributed Power Conversion Networks
LT1105
Offline Switching Regulator
LT1103 Application Circuit LT1103 Pin Configuration LT1103 Pin Configuration LT1103 Pin Configuration LT1103 Performance Graph
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 1

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Software Resources

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Hardware Ecosystem

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

LTspice

Models for the following parts are available in LTspice:

  • LT1105
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