LT3753
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LT3753

Active Clamp Synchronous Forward Controller

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Documentation View All Documentation
LTspice LT3753/LT1431 Demo Circuit - 80W Active Clamp Non-Synchronous Forword Converter for PoE Download 10.00KB LTspice LT3753 - Switching Regulators, LT1431 - Voltage References Download 9.2 KB
Part Models 8
1ku List Price Starting From $3.83
Features
  • Input Voltage Range: 8.5V to 100V
  • Programmable Volt-Second Clamp
  • High Efficiency Control: Active Clamp, Synchronous Rectification, Programmable Delays
  • Short-Circuit (Hiccup Mode) Overcurrent Protection
  • Programmable Soft-Start/Stop
  • Programmable OVLO and UVLO with Hysteresis
  • Programmable Frequency (100kHz to 500kHz)
  • Synchronizable to an External Clock
Additional Details
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The LT3753 is a current mode PWM controller optimized for an active clamp forward converter topology, allowing up to 100V input operation.

A programmable volt-second clamp allows primary switch duty cycles above 50% for high switch, transformer and rectifier utilization. Active clamp control reduces switch voltage stress and increases efficiency. A synchronous output is available for controlling secondary side synchronous rectification.

The LT3753 is available in a 38-lead plastic TSSOP package with missing pins for high voltage spacings.

Applications

  • Industrial, Automotive and Military Systems
  • 48V Telecommunication Isolated Power Supplies
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file View Data Sheet (Rev.C)
Documentation View All Documentation
LTspice LT3753/LT1431 Demo Circuit - 80W Active Clamp Non-Synchronous Forword Converter for PoE Download 10.00KB LTspice LT3753 - Switching Regulators, LT1431 - Voltage References Download 9.2 KB
Part Models 8
1ku List Price Starting From $3.83
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LT3753

Documentation

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Data Sheet

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UPDATED 08/11/2015
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LT3753: Active Clamp Synchronous Forward Controller Data Sheet (Rev.C)

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UPDATED 06/20/2014
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LT3753: アクティブ・クランプ同期整流式フォワード・コントローラ データシート

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User Guide

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UPDATED 09/14/2016
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DC2324A - Demo Manual redirect icon

612.00K

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UPDATED 08/24/2015
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DC2306A - Demo Manual redirect icon

390.00K

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UPDATED 04/22/2014
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DC2050A - Demo Manual redirect icon

420.00K

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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 04/01/2014
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Active Clamp Synchronous Controllers for Forward Converters with 6.5V to 100V+ Inputs redirect icon

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UPDATED 04/01/2014
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入力が6.5V～100V超のフォワード・コンバータ用アクティブ・クランプ同期コントローラ redirect icon

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UPDATED 05/02/2024
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Isolated Switch-Mode Power Supplies: How to Choose a Forward vs. a Flyback Converter redirect icon

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UPDATED 05/02/2024
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絶縁型のスイッチング電源、フォワード型とフライバック型のうちどちらを選べばよいのか？ redirect icon

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UPDATED 02/26/2015
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LT3753 9V-15V Input to 54V/3A Isolated Forward Converter redirect icon

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UPDATED 02/26/2015
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LT3753 9V-15V 输入至 54V/3A 隔离型正激式转换器 redirect icon

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UPDATED 02/26/2015
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LT3753 9V～15V入力から54V/3Aを出力する絶縁型フォワード・コンバータ redirect icon

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UPDATED 07/28/2014
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19V-29V input to 48V/2A Isolated Forward Converter using LT3753 redirect icon

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Documentation

Technical Documents 9
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Data Sheet 1

LT3753: Active Clamp Synchronous Forward Controller Data Sheet (Rev.C)

Reliability Data 1

R530 Reliability Data

User Guide 3

DC2324A - Demo Manual
DC2306A - Demo Manual
DC2050A - Demo Manual

Technical Articles 4

Active Clamp Synchronous Controllers for Forward Converters with 6.5V to 100V+ Inputs
Isolated Switch-Mode Power Supplies: How to Choose a Forward vs. a Flyback Converter
LT3753 9V-15V Input to 54V/3A Isolated Forward Converter
19V-29V input to 48V/2A Isolated Forward Converter using LT3753

Solutions Bulletin & Brochure 1

400V+ Active Clamp Forward

Video

1

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Video

2017-09-18

Active Clamp Synchronous Forward Controllers

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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
LT3753EFE#PBF 38-Lead TSSOP w/ EP external-link
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LT3753EFE#TRPBF 38-Lead TSSOP w/ EP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT3753HFE#PBF 38-Lead TSSOP w/ EP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT3753HFE#TRPBF 38-Lead TSSOP w/ EP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT3753IFE#PBF 38-Lead TSSOP w/ EP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT3753IFE#TRPBF 38-Lead TSSOP w/ EP external-link
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  • Material Declaration external-link
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LT3753MPFE#PBF 38-Lead TSSOP w/ EP external-link
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  • Material Declaration external-link
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LT3753MPFE#TRPBF 38-Lead TSSOP w/ EP external-link
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  • Material Declaration external-link
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Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3753EFE#PBF

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LT3753EFE#TRPBF

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3753EFE#PBF

PRODUCTION

LT3753EFE#TRPBF

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LT3753HFE#PBF

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LT3753HFE#TRPBF

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LT3753IFE#PBF

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LT3753IFE#TRPBF

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LT3753MPFE#TRPBF

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Software & Part Ecosystem

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LT3752
LT3752-1
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Active Clamp Synchronous Forward Controllers with Internal Housekeeping Controller

Evaluation Kits 5

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DC2324A-B

LT3753EFE Demo Board | Isolated Forward Converter, 18V ≤ VIN ≤ 36V; VOUT = 24V @ 5A

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DC2324A-B

LT3753EFE Demo Board | Isolated Forward Converter, 18V ≤ VIN ≤ 36V; VOUT = 24V @ 5A

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DC2324A-B
LT3753EFE Demo Board | Isolated Forward Converter, 18V ≤ VIN ≤ 36V; VOUT = 24V @ 5A
Buy Now View Details

Product Detail

Demonstration circuits 2324A-A, 2324A-B, and 2324A-C are active clamp forward converters with synchronous rectification featuring the LT3753.


These circuits were designed to demonstrate the high level of performance, efficiency and small solution size attainable using this part. They operate at 240kHz. The DC2324A-A produces a 24V/5A output from an input voltage range of 36V to 72V. The DC2324A-B produces a 24V/5A output from an input voltage range of 18V to 36V. The DC2324A-C produces a 24V/4A output from an input voltage range of 9V to 18V, making it suitable for telecom, industrial and other isolated power supply applications. They all have an eighth-brick footprint area. Synchronous rectification helps to attain efficiency exceeding 94% (exceeding 95% for the DC2324A-A and DC2324A-B).

Resources

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PDF

DC2324A - Schematic Download

36.00K

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ZIP

DC2324A - Design Files Download

963.00K

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PDF

DC2324A - Demo Manual Download

612.00K

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reference details image

DC2050A

LT3753EFE Isolated Demo Board | Synchronous Forward Controller with Active Clamp, 36V ≤ VIN ≤ 72V; VOUT = 5V @ 20A

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DC2050A

LT3753EFE Isolated Demo Board | Synchronous Forward Controller with Active Clamp, 36V ≤ VIN ≤ 72V; VOUT = 5V @ 20A

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DC2050A
LT3753EFE Isolated Demo Board | Synchronous Forward Controller with Active Clamp, 36V ≤ VIN ≤ 72V; VOUT = 5V @ 20A
Buy Now View Details

Product Detail

Demonstration circuit 2050A is an active clamp forward converter with synchronous rectification featuring the LT3753. This circuit was designed to demonstrate the high level of performance, efficiency, and small solution size attainable using this part. It operates at 250kHz and produces a regulated 5V, 20A output from an input voltage range of 36V to 72V: suitable for telecom, industrial, and other applications. It has an eighth-brick footprint area. Synchronous rectification helps to attain efficiency exceeding 94%.

Resources

pdf icon

PDF

DC2050A - Demo Manual Download

420.00K

pdf icon

PDF

DC2050A - Schematic Download

38.00K

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ZIP

DC2050A - Design Files Download

964.00K

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reference details image

DC2324A-A

LT3753EFE Demo Board | Isolated Forward Converter, 36V ≤ VIN ≤ 72V; VOUT = 24V @ 5A

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DC2324A-A

LT3753EFE Demo Board | Isolated Forward Converter, 36V ≤ VIN ≤ 72V; VOUT = 24V @ 5A

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Download

 print icon

Print
DC2324A-A
LT3753EFE Demo Board | Isolated Forward Converter, 36V ≤ VIN ≤ 72V; VOUT = 24V @ 5A
Buy Now View Details

Product Detail

Demonstration circuits 2324A-A, 2324A-B, and 2324A-C are active clamp forward converters with synchronous rectification featuring the LT3753.


These circuits were designed to demonstrate the high level of performance, efficiency and small solution size attainable using this part. They operate at 240kHz. The DC2324A-A produces a 24V/5A output from an input voltage range of 36V to 72V. The DC2324A-B produces a 24V/5A output from an input voltage range of 18V to 36V. The DC2324A-C produces a 24V/4A output from an input voltage range of 9V to 18V, making it suitable for telecom, industrial and other isolated power supply applications. They all have an eighth-brick footprint area. Synchronous rectification helps to attain efficiency exceeding 94% (exceeding 95% for the DC2324A-A and DC2324A-B).

Resources

pdf icon

PDF

DC2324A - Schematic Download

36.00K

pdf icon

ZIP

DC2324A - Design Files Download

963.00K

pdf icon

PDF

DC2324A - Demo Manual Download

612.00K

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reference details image

DC2324A-C

LT3753EFE Isolated Demo Board | Sync Forward Controller with Active Clamp, 9V ≤ VIN ≤ 18V; VOUT = 24V @ 4A

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DC2324A-C

LT3753EFE Isolated Demo Board | Sync Forward Controller with Active Clamp, 9V ≤ VIN ≤ 18V; VOUT = 24V @ 4A

download icon

Download

 print icon

Print
DC2324A-C
LT3753EFE Isolated Demo Board | Sync Forward Controller with Active Clamp, 9V ≤ VIN ≤ 18V; VOUT = 24V @ 4A
Buy Now View Details

Product Detail

Demonstration circuits 2324A-A, 2324A-B, and 2324A-C are active clamp forward converters with synchronous rectification featuring the LT3753.


These circuits were designed to demonstrate the high level of performance, efficiency and small solution size attainable using this part. They operate at 240kHz. The DC2324A-A produces a 24V/5A output from an input voltage range of 36V to 72V. The DC2324A-B produces a 24V/5A output from an input voltage range of 18V to 36V. The DC2324A-C produces a 24V/4A output from an input voltage range of 9V to 18V, making it suitable for telecom, industrial and other isolated power supply applications. They all have an eighth-brick footprint area. Synchronous rectification helps to attain efficiency exceeding 94% (exceeding 95% for the DC2324A-A and DC2324A-B).


 


Resources

pdf icon

PDF

DC2324A - Schematic Download

36.00K

pdf icon

ZIP

DC2324A - Design Files Download

963.00K

pdf icon

PDF

DC2324A - Demo Manual Download

612.00K

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reference details image

DC2306A

LT3753EFE Isolated Demo Board | Forward Converter, 10V ≤ VIN ≤ 54V; VOUT = 48V or 54V (Jumper Selectable) @ 1.5A

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DC2306A

LT3753EFE Isolated Demo Board | Forward Converter, 10V ≤ VIN ≤ 54V; VOUT = 48V or 54V (Jumper Selectable) @ 1.5A

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Download

 print icon

Print
DC2306A
LT3753EFE Isolated Demo Board | Forward Converter, 10V ≤ VIN ≤ 54V; VOUT = 48V or 54V (Jumper Selectable) @ 1.5A
Buy Now View Details

Product Detail

Demonstration circuit 2306A is an active clamp forward converter featuring the LT3753.


This circuit was designed to demonstrate the high level of performance and efficiency that can be attained with the LT3753. It operates at 100kHz and produces a regulated 54V, 1.5A output from a wide input voltage range of 10V to 54V, making it suitable for telecom, industrial, and other applications. The output voltage of this circuit is jumper selectable between 54V and 48V.


 


Resources

pdf icon

ZIP

DC2306A - Design Files Download

1.00M

pdf icon

PDF

DC2306A - Demo Manual Download

390.00K

pdf icon

PDF

DC2306A - Schematic Download

41.00K

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Evaluation Kits5

evaluation kit item images

DC2324A-B

LT3753EFE Demo Board | Isolated Forward Converter, 18V ≤ VIN ≤ 36V; VOUT = 24V @ 5A
evaluation kit item images

DC2050A

LT3753EFE Isolated Demo Board | Synchronous Forward Controller with Active Clamp, 36V ≤ VIN ≤ 72V; VOUT = 5V @ 20A
evaluation kit item images

DC2324A-A

LT3753EFE Demo Board | Isolated Forward Converter, 36V ≤ VIN ≤ 72V; VOUT = 24V @ 5A
evaluation kit item images

DC2324A-C

LT3753EFE Isolated Demo Board | Sync Forward Controller with Active Clamp, 9V ≤ VIN ≤ 18V; VOUT = 24V @ 4A
evaluation kit item images

DC2306A

LT3753EFE Isolated Demo Board | Forward Converter, 10V ≤ VIN ≤ 54V; VOUT = 48V or 54V (Jumper Selectable) @ 1.5A

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

LT3753/LT1431 Demo Circuit - 80W Active Clamp Non-Synchronous Forword Converter for PoE Download

10.00K

spice tool Lt Spice

LT3753 - Switching Regulators, LT1431 - Voltage References Download

9.2 K

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