LT3574
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LT3574

Isolated Flyback Converter Without an Opto-Coupler

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 4
1ku List Price Starting From $3.32
Features
  • 3V to 40V Input Voltage Range
  • 0.65A, 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
  • 16-Lead MSOP Package
Additional Details
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The LT3574 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 0.65A, 60V NPN power switch is integrated along with all control logic into a 16-lead MSOP package.

The LT3574 operates with input supply voltages from 3V to 40V, and can deliver output power up to 3W with no external power switch. The LT3574 utilizes boundary mode operation to provide a small magnetic solution with improved load regulation.

The output voltage is easily set with two external resistors and the transformer turns ratio. Off-the-shelf transformers are available for many applications.

Applications

  • Industrial, Automotive and Medical Isolated Power Supplies
Part Models 4
1ku List Price Starting From $3.32

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Oct 11, 2022

- 22_0244

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LT3574EMS#PBF

PRODUCTION

LT3574EMS#TRPBF

PRODUCTION

LT3574IMS#PBF

PRODUCTION

LT3574IMS#TRPBF

PRODUCTION

Feb 4, 2020

- 20_0132

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

LT3574EMS#PBF

PRODUCTION

LT3574EMS#TRPBF

PRODUCTION

LT3574IMS#PBF

PRODUCTION

LT3574IMS#TRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0244

arrow down

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LT3574EMS#PBF

PRODUCTION

LT3574EMS#TRPBF

PRODUCTION

LT3574IMS#PBF

PRODUCTION

LT3574IMS#TRPBF

PRODUCTION

Feb 4, 2020

- 20_0132

arrow down

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

LT3574EMS#PBF

PRODUCTION

LT3574EMS#TRPBF

PRODUCTION

LT3574IMS#PBF

PRODUCTION

LT3574IMS#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC1636A

LT3574EMS Isolated Demo Board | 10V to 30VIN; VOUT = 5V @ 0.35A to 0.5A

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DC1636A

LT3574EMS Isolated Demo Board | 10V to 30VIN; VOUT = 5V @ 0.35A to 0.5A

LT3574EMS Isolated Demo Board | 10V to 30VIN; VOUT = 5V @ 0.35A to 0.5A

Product Detail

Demonstration circuit 1636A is an isolated flyback converter featuring the LT3574. This demo circuit is designed for a 5.0V output from a 10V to 30V input. The maximum output current is 0.5A 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 LT3574 operates with input supply voltages from 3V to 40V, and can deliver an output power up to 3W with no external power switch. The LT3574 utilizes boundary mode operation to provide a small magnetic solution with improved load regulation.

Tools & Simulations

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.

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