LT3573
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LT3573

Isolated Flyback Converter without an Opto-Coupler

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LTspice LT3573 - Switching Regulators Download 3.38 KB LTspice LT3573 Demo Circuit - Isolated No Opto Flyback Converter (24V to 5V @ 1A) Download 4.00KB
Part Models 4
1ku List Price Starting From $3.32
Features
  • 3V to 40V Input Voltage Range
  • 1.25A, 60V Integrated NPN 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 NPN Driver
  • Programmable Soft-Start
  • Programmable Power Switch Current Limit
  • Thermally Enhanced 16-Lead MSOP
Additional Details
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The LT3573 is a monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or opto-isolator is required for regulation. The part senses the isolated output voltage directly from the primary-side flyback waveform. A 1.25A, 60V NPN power switch is integrated along with all control logic into a 16-lead MSOP package.

The LT3573 operates with input supply voltages from 3V to 40V, and can deliver output power up to 7W with no external power devices.The LT3573 utilizes boundary mode operation to provide a small magnetic solution with improved load regulation.

Applications

  • Industrial, Automotive and Medical Isolated Power Supplies
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file View Data Sheet
Documentation View All Documentation
LTspice LT3573 - Switching Regulators Download 3.38 KB LTspice LT3573 Demo Circuit - Isolated No Opto Flyback Converter (24V to 5V @ 1A) Download 4.00KB
Part Models 4
1ku List Price Starting From $3.32
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LT3573

Documentation

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Data Sheet

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UPDATED 12/10/2013
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LT3573: Isolated Flyback Converter without an Opto-Coupler Data Sheet

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275.00K
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UPDATED 04/07/2014
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LT3573: オプトカプラ不要の絶縁型フライバック･コンバータ データシート

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604.00K
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Design Note

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UPDATED 10/24/2012
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DN509 - Micropower Isolated Flyback Converter with Input Voltage Range from 6V to 100V redirect icon

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UPDATED 11/19/2012
Chinese
DN509 - 具 6V 至 100V 输入电压范围的微功率隔离反激式转换器 redirect icon

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UPDATED 01/07/2013
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DN509 - 入力電圧範囲6V ～ 100V のマイクロパワー絶縁型フライバック・ コンバータ redirect icon

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UPDATED 02/25/2014
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DN525 - Monolithic No-Opto Isolated Flyback Converter Provides Versatile Solution redirect icon

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UPDATED 02/24/2014
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DN525 - 无需使用光耦合器的单片隔离型反激式转换器可提供通用型解决方案 redirect icon

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UPDATED 03/13/2014
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DN525 - 幅広いソリューションを提供するオプトカプラ不要のモノリシック 絶縁型フライバック・コンバータ redirect icon

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User Guide

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UPDATED 10/29/2013
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DC1228A - Demo Manual redirect icon

312.00K

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Reliability Data

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UPDATED 03/26/2018
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R530 Reliability Data redirect icon

20.92 K

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Technical Articles

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UPDATED 01/01/2009
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Primary-Side Sensing Takes Complexity out of Isolated Flyback Converter Design redirect icon

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UPDATED 01/21/2022
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When Pulses Are Omitted in Switch-Mode Power Supplies redirect icon

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UPDATED 01/21/2022
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在开关模式电源中，当脉冲被忽略时 redirect icon

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UPDATED 01/21/2022
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不連続なパルスを使用する スイッチング・レギュレータ redirect icon

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UPDATED 12/01/2012
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Micropower Isolated Flyback Converter with Input Voltage Range from 6V to 100V redirect icon

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Documentation

Technical Documents 8
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Data Sheet 1

LT3573: Isolated Flyback Converter without an Opto-Coupler Data Sheet

Reliability Data 1

R530 Reliability Data

User Guide 1

DC1228A - Demo Manual

Design Note 2

DN509 - Micropower Isolated Flyback Converter with Input Voltage Range from 6V to 100V
DN525 - Monolithic No-Opto Isolated Flyback Converter Provides Versatile Solution

Technical Articles 3

Primary-Side Sensing Takes Complexity out of Isolated Flyback Converter Design
When Pulses Are Omitted in Switch-Mode Power Supplies
Micropower Isolated Flyback Converter with Input Voltage Range from 6V to 100V

Solutions Bulletin & Brochure 1

Isolated Power Your Way

Product Selector Card 1

48V No-Opto Isolated Applications

Video

1

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Video

2017-09-18

04:37

How To Design a Simple Isolated Flyback Converter - LT3573

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT3573EMSE#PBF 16-Lead MSOP w/ EP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT3573EMSE#TRPBF 16-Lead MSOP w/ EP external-link
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  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LT3573IMSE#PBF 16-Lead MSOP w/ EP external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LT3573IMSE#TRPBF 16-Lead MSOP w/ EP external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link

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Product Lifecycle

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Jun 5, 2024

- 24_0003

Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)

LT3573EMSE#PBF

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LT3573EMSE#TRPBF

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LT3573IMSE#PBF

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PCN24_0003_Form

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Material_Report

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Qualification Results Summary

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Delta Qualification Matrix

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Feb 4, 2020

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Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

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LT3573EMSE#TRPBF

PRODUCTION

LT3573IMSE#PBF

PRODUCTION

LT3573IMSE#TRPBF

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PCN20_0132_Form

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Material_Report

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Jun 5, 2024

- 24_0003

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Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)

LT3573EMSE#PBF

PRODUCTION

LT3573EMSE#TRPBF

PRODUCTION

LT3573IMSE#PBF

PRODUCTION

LT3573IMSE#TRPBF

PRODUCTION

pdf

PCN24_0003_Form

external-icon

xls

Material_Report

Download

pdf

Qualification Results Summary

external-icon

xlsm

Delta Qualification Matrix

Download
Feb 4, 2020

- 20_0132

arrow down

Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

LT3573EMSE#PBF

PRODUCTION

LT3573EMSE#TRPBF

PRODUCTION

LT3573IMSE#PBF

PRODUCTION

LT3573IMSE#TRPBF

PRODUCTION

pdf

PCN20_0132_Form

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xls

Material_Report

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Evaluation Kits 1

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DC1228A

LT3573EMSE | 10V to 30 VIN, 5 VOUT at 1A Isolated Monolithic Flyback Converter

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DC1228A

LT3573EMSE | 10V to 30 VIN, 5 VOUT at 1A Isolated Monolithic Flyback Converter

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DC1228A
LT3573EMSE | 10V to 30 VIN, 5 VOUT at 1A Isolated Monolithic Flyback Converter
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Product Detail

Demonstration circuit 1228A is an isolated flyback converter featuring the LT3573. This demo circuit is designed for a 5.0V output from a 10V to 30V input. The maximum output current is 1A when the input voltage is higher than 20V. No third winding or opto-isolator is required for regulation. The part senses the isolated output voltage directly from the primary-side flyback waveform. The LT3573 operates with input supply voltages from 3V to 40V, and can deliver an output power up to 7W with no external power devices. The LT3573 utilizes boundary mode operation to provide a small magnetic solution with improved load regulation.


 


Resources

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PDF

DC1228A - Demo Manual Download

312.00K

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PDF

DC1228A - Schematic Download

42.00K

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DC1228A - Design File Download

710.00K

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Evaluation Kits1

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DC1228A

LT3573EMSE | 10V to 30 VIN, 5 VOUT at 1A Isolated Monolithic Flyback Converter

Tools & Simulations 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

spice tool Lt Spice

LT3573 - Switching Regulators Download

3.38 K

spice tool Lt Spice

LT3573 Demo Circuit - Isolated No Opto Flyback Converter (24V to 5V @ 1A) Download

4.00K

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