LT3511

PRODUCTION

Monolithic High Voltage Isolated Flyback Converter

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Overview

  • 4.5V to 100V Input Voltage Range
  • Internal 240mA, 150V Power Switch
  • Boundary Mode Operation
  • No Transformer Third Winding or Opto-Isolator Required for Regulation
  • Improved Primary-Side Winding Feedback Load Regulation
  • VOUT Set with Two External Resistors
  • BIAS Pin for Internal Bias Supply and Power Switch Driver
  • No External Start-Up Resistor
  • 16-Lead MSOP Package

The LT3511 is a high voltage monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or opto-isolator is required for regulation as the part senses output voltage directly from the primary-side flyback waveform. The device integrates a 240mA, 150V power switch, high voltage circuitry, and control into a high voltage 16-lead MSOP package with four leads removed.

The LT3511 operates from an input voltage range of 4.5V to 100V and delivers up to 2.5W of isolated output power. Two external resistors and the transformer turns ratio easily set the output voltage. Off-the-shelf transformers are available for several applications. The high level of integration and the use of boundary mode operation results in a simple, clean, tightly regulated application solution to the traditionally tough problem of isolated power delivery.

Applications

  • Isolated Telecom Power Supplies
  • Isolated Auxiliary/Housekeeping Power Supplies
  • Isolated Industrial, Automotive and Medical Power Supplies
LT3511
Monolithic High Voltage Isolated Flyback Converter
48V to 5V Isolated Flyback Converter Output Load and Line Regulation Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 2

Technical Articles 1

Data Sheet

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

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Interface Transceivers & Isolators 1
LTM2881
PRODUCTION Complete Isolated RS485/RS422 μModule Transceiver + Power
Protection Switches & Controllers 2
LTC4364
RECOMMENDED FOR NEW DESIGNS Surge Stopper with Ideal Diode
LTC4359
RECOMMENDED FOR NEW DESIGNS Ideal Diode Controller with Reverse Input Protection
Switching Regulators & Controllers 1
LTM8048
RECOMMENDED FOR NEW DESIGNS 3.1VIN to 32VIN Isolated μModule (Power Module) DC/DC Converter with LDO Post Regulator
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3511
LTspice

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.

Evaluation Kits

eval board
schematic 1
DC1517A

LT3511EMS Demo Board | 36V to 75VIN, VOUT = 5V @ 300mA

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Product Details

Demonstration circuit 1517A is a monolithic high voltage isolated flyback converter featuring the LT3511. This demo circuit is designed for a 5V isolated output from an input voltage range of 36V to 75V. The maximum output current is up to 300mA. The circuit doesn’t require an opto-isolator, due to the output voltage being sensed directly from the primary side transformer winding. A third winding off the transistor is used to bias the LT3511 for highest efficiency.
DC1517A
LT3511EMS Demo Board | 36V to 75VIN, VOUT = 5V @ 300mA
DC1517A - Schematic

Latest Discussions

26 Weeks Ago
LT3511 flyback converter - Lower output voltage than expected
2 Years Ago
I am using a flyback converter (LT3511) to generate +70V and -70V to power the LTC6090(High Voltage Opamp), the circuit work fine when the opamp is not connected but gives zero output when the opamp is connected. I am using 4 opamps in total.
2 Years Ago
I am using a flyback converter (LT3511)to generate +70V and -70V to power the LTC6090(High Voltage Opamp), the circuit works fine when the opamp is not connected but gives zero output when the opamp is connected. I am using 4 opamps in total.
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