LT1725
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LT1725

General Purpose Isolated Flyback Controller

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LTspice LT1725 - Switching Regulators Download 3.3 KB
Part Models 8
1ku List Price Starting From $3.64
Features
  • Drives External Power MOSFET with External ISENSE Resistor
  • Application Input Voltage Limited Only by External Power Components
  • Senses Output Voltage Directly from Primary Side Winding—No Optoisolator Required
  • Accurate Regulation Without User Trims
  • Regulation Maintained Well into Discontinuous Mode
  • Switching Frequency from 50kHz to 250kHz with External Capacitor
  • Optional Load Compensation
  • Optional Undervoltage Lockout
  • Available in 16-Pin SO and SSOP Packages
Additional Details
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The LT1725 is a monolithic switching regulator controller specifically designed for the isolated flyback topology. It drives the gate of an external MOSFET and is generally powered from a third transformer winding. These features allow for an application input voltage limited only by external power path components. The third transformer winding also provides output voltage feedback information, such that an optoisolator is not required. Its gate drive capability coupled with a suitable external MOSFET can deliver load power up to tens of watts.

The LT1725 has a number of features not found on most other switching regulator ICs. By utilizing current mode switching techniques, it provides excellent AC and DC line regulation. Its unique control circuitry can maintain regulation well into discontinuous mode in most applications. Optional load compensation circuitry allows for improved load regulation. An optional undervoltage lockout pin halts operation when the application input voltage is too low. An optional external capacitor implements a soft-start function. A 3V output is available at up to several mA for powering primary side application circuitry.

Applications

  • Telecom Isolated Converters
  • Offline Isolated Power Supplies
  • Instrumentation Power Supplies
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Documentation View All Documentation
LTspice LT1725 - Switching Regulators Download 3.3 KB
Part Models 8
1ku List Price Starting From $3.64
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LT1725

Documentation

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Data Sheet

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UPDATED 08/19/2009
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LT1725: General Purpose Isolated Flyback Controller Data Sheet

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UPDATED 05/31/2005
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LT1725: 汎用絶縁型フライバック・コントローラ データシート

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352.00K
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Design Note

4

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UPDATED 04/04/2014
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DN338 - Power over Ethernet Isolated Power Supply Delivers 11.5W at 90% Efficiency redirect icon

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UPDATED 02/25/2008
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DN338 効率90%で11.5W を給電するPower over Ethernet 絶縁型電源 redirect icon

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UPDATED 04/01/2014
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DN260 - Isolated Flyback Converter Regulates Without an Optocoupler redirect icon

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UPDATED 02/25/2008
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DN260 オプトカプラ無しでレギュレーションをおこなう絶縁型フライバック・コンバータ redirect icon

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User Guide

7

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UPDATED 09/24/2009
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DC638A - Demo Manual redirect icon

242.00K

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UPDATED 09/24/2009
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DC508A - Demo Manual redirect icon

277.00K

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UPDATED 09/24/2009
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DC431A - Demo Manual redirect icon

522.00K

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UPDATED 03/19/2010
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DC37*A - Demo Manual redirect icon

226.00K

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UPDATED 12/07/2009
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DC562A-C - Demo Manual redirect icon

296.00K

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UPDATED 12/07/2009
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DC526A-A - Demo Manual redirect icon

331.00K

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UPDATED 12/07/2009
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DC562A-B - Demo Manual redirect icon

308.00K

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Reliability Data

1

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UPDATED 03/26/2018
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R387 Reliability Data redirect icon

20.35 K

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Technical Articles

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UPDATED 05/01/2002
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Simple Isolated Telecom Flyback Circuit Provides Regulation Without Optocoupler redirect icon

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Documentation

Technical Documents 12
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Data Sheet 1

LT1725: General Purpose Isolated Flyback Controller Data Sheet

Reliability Data 1

R387 Reliability Data

User Guide 7

DC638A - Demo Manual
DC508A - Demo Manual
DC431A - Demo Manual
DC37*A - Demo Manual
DC562A-C - Demo Manual
DC526A-A - Demo Manual
DC562A-B - Demo Manual

Design Note 2

DN338 - Power over Ethernet Isolated Power Supply Delivers 11.5W at 90% Efficiency
DN260 - Isolated Flyback Converter Regulates Without an Optocoupler

Technical Articles 1

Simple Isolated Telecom Flyback Circuit Provides Regulation Without Optocoupler

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
LT1725CGN#PBF 16-Lead SSOP (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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LT1725CGN#TRPBF 16-Lead SSOP (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1725CS#PBF 16-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1725CS#TRPBF 16-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1725IGN#PBF 16-Lead SSOP (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1725IGN#TRPBF 16-Lead SSOP (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1725IS#PBF 16-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LT1725IS#TRPBF 16-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link

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Product Lifecycle

PCN

Oct 3, 2024

- 24_0235

(QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking

LT1725CGN#PBF

PRODUCTION

LT1725CGN#TRPBF

PRODUCTION

LT1725IGN#PBF

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LT1725IGN#TRPBF

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PCN24_0235_Form

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Material_Report

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xlsm

Delta Qualification Matrix

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Oct 11, 2022

- 22_0235

Epoxy Change from Henkel 8290 to 8290A for GN Package

LT1725CGN#PBF

PRODUCTION

LT1725CGN#TRPBF

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LT1725IGN#PBF

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LT1725IGN#TRPBF

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PCN22_0235_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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Apr 6, 2022

- 22_0066

Laser Top Mark for 16QSOP Assembled in ADPG [PNG]

LT1725CGN#PBF

PRODUCTION

LT1725CGN#TRPBF

PRODUCTION

LT1725IGN#PBF

PRODUCTION

LT1725IGN#TRPBF

PRODUCTION

pdf

PCN22_0066_Form

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xls

Material_Report

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xlsm

Delta Qualification Matrix

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Oct 12, 2022

- 22_0252

Epoxy Change from Henkel 8290 to 8290A for 16-Lead SOIC Package

LT1725CS#PBF

PRODUCTION

LT1725CS#TRPBF

PRODUCTION

LT1725IS#PBF

PRODUCTION

LT1725IS#TRPBF

PRODUCTION

pdf

PCN22_0252_Form

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xls

Material_Report

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Qualification Results Summary

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Aug 6, 2022

- 22_0173

Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]

LT1725CS#PBF

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LT1725CS#TRPBF

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LT1725IS#PBF

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LT1725IS#TRPBF

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PCN22_0173_Form

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Material_Report

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Delta Qualification Matrix

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PCN

Oct 3, 2024

- 24_0235

arrow down

(QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking

LT1725CGN#PBF

PRODUCTION

LT1725CGN#TRPBF

PRODUCTION

LT1725IGN#PBF

PRODUCTION

LT1725IGN#TRPBF

PRODUCTION

pdf

PCN24_0235_Form

external-icon

xls

Material_Report

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pdf

Other

external-icon

xlsm

Delta Qualification Matrix

Download
Oct 11, 2022

- 22_0235

arrow down

Epoxy Change from Henkel 8290 to 8290A for GN Package

LT1725CGN#PBF

PRODUCTION

LT1725CGN#TRPBF

PRODUCTION

LT1725IGN#PBF

PRODUCTION

LT1725IGN#TRPBF

PRODUCTION

pdf

PCN22_0235_Form

external-icon

xls

Material_Report

Download

pdf

Qualification Results Summary

external-icon

xlsm

Delta Qualification Matrix

Download
Apr 6, 2022

- 22_0066

arrow down

Laser Top Mark for 16QSOP Assembled in ADPG [PNG]

LT1725CGN#PBF

PRODUCTION

LT1725CGN#TRPBF

PRODUCTION

LT1725IGN#PBF

PRODUCTION

LT1725IGN#TRPBF

PRODUCTION

pdf

PCN22_0066_Form

external-icon

xls

Material_Report

Download

xlsm

Delta Qualification Matrix

Download
Oct 12, 2022

- 22_0252

arrow down

Epoxy Change from Henkel 8290 to 8290A for 16-Lead SOIC Package

LT1725CS#PBF

PRODUCTION

LT1725CS#TRPBF

PRODUCTION

LT1725IS#PBF

PRODUCTION

LT1725IS#TRPBF

PRODUCTION

pdf

PCN22_0252_Form

external-icon

xls

Material_Report

Download

pdf

Qualification Results Summary

external-icon
Aug 6, 2022

- 22_0173

arrow down

Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]

LT1725CS#PBF

PRODUCTION

LT1725CS#TRPBF

PRODUCTION

LT1725IS#PBF

PRODUCTION

LT1725IS#TRPBF

PRODUCTION

pdf

PCN22_0173_Form

external-icon

xls

Material_Report

Download

xlsm

Delta Qualification Matrix

Download

Software & Part Ecosystem

Parts Product Life Cycle Description

Isolated µModule Converters2
LTM8047
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RECOMMENDED FOR NEW DESIGNS

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Evaluation Kits 8

reference details image

DC562A-A

LT1725CGN | Isolated Forward Converter, VIN=36V to 72V, VOUT=3.3V@30A

reference details image

DC562A-C

LT1725CGN | Isolated Forward Converter, VIN=36V to 72V, VOUT=12V@12A

reference details image

DC562A-B

LT1725CGN | Isolated Forward Converter, VIN=36V to 72V, VOUT=5V@20A

reference details image

DC373A-B

LT1725IGN | 48VIN to 3.3V/3A, 10W Module, Isolated Flyback, 1x2 Footprint

reference details image

DC638A

LT1725CGN | Synchronous Flyback Converter, 36V to 72VIN, to 3.3V @ 3.5A, 350mA Input Current

reference details image

DC373A-A

LT1725IGN | 48VIN to 5VOUT 2A Module, Isolated Flyback, 1x2 Footprint

reference details image

DC508A

LT1725CGN | Low Cost, High Efficiency Synchronous Forward Converter without Optoisolator, +VIN = 36V to 72V, +VOUT = 2.5V/3.3V at 10A

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DC508A

LT1725CGN | Low Cost, High Efficiency Synchronous Forward Converter without Optoisolator, +VIN = 36V to 72V, +VOUT = 2.5V/3.3V at 10A

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Download

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DC508A
LT1725CGN | Low Cost, High Efficiency Synchronous Forward Converter without Optoisolator, +VIN = 36V to 72V, +VOUT = 2.5V/3.3V at 10A
Buy Now View Details

Product Detail

DC508A: Demo Board for the LT1725 General Purpose Isolated Flyback Controller.

Resources

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PDF

DC508A - Demo Manual Download

277.00K

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PDF

DC508A - Schematic Download

73.00K

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ZIP

DC508A - Design File Download

740.00K

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DC431A

LT1725CGN LTC1773EMS | Telecom Input, Isolated 3 Output DC/DC Converter, +36V to +72V Input, VOUT = 5V/1A, 3.3V/5A, 2.5V/4A

zoom

DC431A

LT1725CGN LTC1773EMS | Telecom Input, Isolated 3 Output DC/DC Converter, +36V to +72V Input, VOUT = 5V/1A, 3.3V/5A, 2.5V/4A

download icon

Download

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Print
DC431A
LT1725CGN LTC1773EMS | Telecom Input, Isolated 3 Output DC/DC Converter, +36V to +72V Input, VOUT = 5V/1A, 3.3V/5A, 2.5V/4A
Buy Now View Details

Product Detail

DC431A Demo Board for:
LT1725 General Purpose Isolated Flyback Controller
LTC1773 Synchronous Step-Down DC/DC Controller

Resources

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PDF

DC431A - Schematic Download

31.00K

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ZIP

DC431A - Design File Download

1.00M

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PDF

DC431A - Demo Manual Download

522.00K

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Evaluation Kits8

evaluation kit item images

DC562A-A

LT1725CGN | Isolated Forward Converter, VIN=36V to 72V, VOUT=3.3V@30A
evaluation kit item images

DC562A-C

LT1725CGN | Isolated Forward Converter, VIN=36V to 72V, VOUT=12V@12A
evaluation kit item images

DC562A-B

LT1725CGN | Isolated Forward Converter, VIN=36V to 72V, VOUT=5V@20A
evaluation kit item images

DC373A-B

LT1725IGN | 48VIN to 3.3V/3A, 10W Module, Isolated Flyback, 1x2 Footprint
evaluation kit item images

DC638A

LT1725CGN | Synchronous Flyback Converter, 36V to 72VIN, to 3.3V @ 3.5A, 350mA Input Current
evaluation kit item images

DC373A-A

LT1725IGN | 48VIN to 5VOUT 2A Module, Isolated Flyback, 1x2 Footprint
evaluation kit item images

DC508A

LT1725CGN | Low Cost, High Efficiency Synchronous Forward Converter without Optoisolator, +VIN = 36V to 72V, +VOUT = 2.5V/3.3V at 10A
evaluation kit item images

DC431A

LT1725CGN LTC1773EMS | Telecom Input, Isolated 3 Output DC/DC Converter, +36V to +72V Input, VOUT = 5V/1A, 3.3V/5A, 2.5V/4A

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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LT1725 - Switching Regulators Download

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