LT3752
LT3752-1
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LT3752
LT3752-1

Active Clamp Synchronous Forward Controllers with Internal Housekeeping Controller

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Documentation View All Documentation
LTspice LT3752/LT8311 Demo Circuit - Active Clamp Forward Converter with Synchronous Rectification (36-72V to 12V @ 12A) Download 13.00KB LTspice LT3752-1/LT8311 Demo Circuit - 200W Active Clamp Forward Converter with Synchronous Rectification (150-400V to 12V @ 16.7A) Download 15.00KB LTspice LT3752 - Switching Regulators Download 7.47 KB LTspice LT8311 - Power Control, LT3752 - Switching Regulators Download 12.67 KB
Part Models 28
1ku List Price Starting From $4.07
Features
  • Input Voltage Range: LT3752: 6.5V to 100V, LT3752-1:Limited Only by External Components
  • Internal Housekeeping DC/DC Controller
  • 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
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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The LT3752/LT3752-1 are current mode PWM controllers optimized for an active clamp forward converter topology. A DC/DC housekeeping controller is included for improved efficiency and performance. The LT3752 allows operation up to 100V input and the LT3752-1 is optimized for applications with input voltages greater than 100V.

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 LT3752/LT3752-1 are available in a 38-lead plastic TSSOP package with missing pins for high voltage spacings.

Applications

  • Offline and HV Car Battery Isolated Power Supplies
  • 48V Telecommunication Isolated Power Supplies
  • Industrial, Automotive and Military Systems
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file View Data Sheet (Rev.C)
Documentation View All Documentation
LTspice LT3752/LT8311 Demo Circuit - Active Clamp Forward Converter with Synchronous Rectification (36-72V to 12V @ 12A) Download 13.00KB LTspice LT3752-1/LT8311 Demo Circuit - 200W Active Clamp Forward Converter with Synchronous Rectification (150-400V to 12V @ 16.7A) Download 15.00KB LTspice LT3752 - Switching Regulators Download 7.47 KB LTspice LT8311 - Power Control, LT3752 - Switching Regulators Download 12.67 KB
Part Models 28
1ku List Price Starting From $4.07
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LT3752
LT3752-1

Documentation

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UPDATED 07/22/2015
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LT3752: Active Clamp Synchronous Forward Controllers with Internal Housekeeping Controller Data Sheet (Rev.C)

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UPDATED 07/22/2015
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LT3752/LT3752-1: Active Clamp Synchronous Forward Controllers with Internal Housekeeping Controller Data Sheet

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LT3752: ハウスキーピング・コントローラを内蔵したアクティブ・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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UPDATED 08/17/2016
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DC2175A - Demo Manual redirect icon

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DC1994A - Demo Manual redirect icon

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DC1929A - Demo Manual redirect icon

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UPDATED 03/26/2018
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R530 Reliability Data redirect icon

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Technical Articles

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UPDATED 02/11/2015
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LT3752/LT8311 48Vin, 24Vout Active Clamp Forward Converter with High Light Load Efficiency redirect icon

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UPDATED 02/11/2015
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LT3752 / LT8311 具有高轻负载效率的 48Vin、24Vout 有源箝位正激式转换器 redirect icon

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UPDATED 02/11/2015
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LT3752/LT8311 軽負荷での効率の高い48V入力、24V出力のアクティブ・クランプ・フォワード・コンバータ redirect icon

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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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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 07/28/2014
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LT3752/LT8311 240W Isolated Forward Converter redirect icon

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Documentation

Technical Documents 8
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Data Sheet 1

LT3752: Active Clamp Synchronous Forward Controllers with Internal Housekeeping Controller Data Sheet (Rev.C)

Reliability Data 1

R530 Reliability Data

User Guide 3

DC2175A - Demo Manual
DC1994A - Demo Manual
DC1929A - Demo Manual

Technical Articles 3

LT3752/LT8311 48Vin, 24Vout Active Clamp Forward Converter with High Light Load Efficiency
Active Clamp Synchronous Controllers for Forward Converters with 6.5V to 100V+ Inputs
LT3752/LT8311 240W Isolated Forward Converter

Solutions Bulletin & Brochure 1

400V+ Active Clamp Forward

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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
LT3752EFE#PBF 38-Lead TSSOP w/ EP external-link
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LT3752EFE-1#PBF 38-Lead TSSOP w/ EP external-link
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LT3752HFE-1#PBF 38-Lead TSSOP w/ EP external-link
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LT3752HFE-1#WTRPBF 38-Lead TSSOP w/ EP external-link
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LT3752IFE#PBF 38-Lead TSSOP w/ EP external-link
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LT3752IFE#TRPBF 38-Lead TSSOP w/ EP external-link
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LT3752IFE-1#TRPBF 38-Lead TSSOP w/ EP external-link
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LT3752IFE-1#WPBF 38-Lead TSSOP w/ EP external-link
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LT3752IFE-1#WTRPBF 38-Lead TSSOP w/ EP external-link
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LT3752MPFE#PBF 38-Lead TSSOP w/ EP external-link
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LT3752MPFE#TRPBF 38-Lead TSSOP w/ EP external-link
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LT3752MPFE-1#PBF 38-Lead TSSOP w/ EP external-link
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Software & Part Ecosystem

Parts Product Life Cycle Description

Surge Stopper, Overvoltage, and Overcurrent Protection1
LTC4366
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High Voltage Surge Stopper

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LT3753
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Active Clamp Synchronous Forward Controller

Evaluation Kits 3

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DC2175A

LT3752IFE/LT8311IFE Demo Board | Forward Converter with Synchronous Rectification, 9V ≤ VIN ≤ 36V; VOUT = 12V @ 13A

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DC2175A

LT3752IFE/LT8311IFE Demo Board | Forward Converter with Synchronous Rectification, 9V ≤ VIN ≤ 36V; VOUT = 12V @ 13A

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DC2175A
LT3752IFE/LT8311IFE Demo Board | Forward Converter with Synchronous Rectification, 9V ≤ VIN ≤ 36V; VOUT = 12V @ 13A
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Product Detail

Demonstration circuit 2175A is an active clamp forward converter with synchronous rectification featuring the LT3752/LT8311 chipset.


This circuit was designed to demonstrate the high levels of performance, efficiency and high power. It operates at 200kHz and produces a regulated 12V, 13A output from a wide input voltage range of 9V to 36V, making it well suited for telecom, industrial, and other applications. Synchronous rectification helps to attain efficiency exceeding 93%.


 


Resources

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DC2175A - Schematic Download

46.00K

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DC2175A - Design Files Download

1.00M

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DC2175A - Demo Manual Download

306.00K

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DC1994A

LT3752EFE/LT8311EFE Isolated Demo Board | 18V ≤ VIN ≤ 72V; VOUT: 12V @ 12A

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DC1994A

LT3752EFE/LT8311EFE Isolated Demo Board | 18V ≤ VIN ≤ 72V; VOUT: 12V @ 12A

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DC1994A
LT3752EFE/LT8311EFE Isolated Demo Board | 18V ≤ VIN ≤ 72V; VOUT: 12V @ 12A
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Demonstration circuit 1994A is an active clamp forward converter with synchronous rectification featuring the LT3752/LT8311 chipset. This circuit was designed to demonstrate the high levels of performance, efficiency, and small solution size attainable using these parts. It operates at 240kHz and produces a regulated 12V, 12A output from an input voltage range of 18 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

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DC1994A - Schematic Download

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DC1994A - Demo Manual Download

531.00K

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DC1994A - Design Files Download

1.00M

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DC1929A

LT3752EFE-1/LT8311EFE Demo Board | 150V ≤ VIN ≤ 400V, VOUT = 12V @ 16.7A

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DC1929A

LT3752EFE-1/LT8311EFE Demo Board | 150V ≤ VIN ≤ 400V, VOUT = 12V @ 16.7A

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DC1929A
LT3752EFE-1/LT8311EFE Demo Board | 150V ≤ VIN ≤ 400V, VOUT = 12V @ 16.7A
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Product Detail

Demonstration circuit 1929A is a 200W active clamp forward converter featuring the LT3752-1/LT8311 chipset. The LT8311 is a secondary-side synchronous rectifier controller. The solution operates at about 100kHz and produces an isolated, regulated 12V / 16.7A output from an input voltage ranging from 150V to 400V, making it well suited for automotive, industrial, and other applications.


 


Resources

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DC1929A - Design Files Download

1.00M

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DC1929A - Demo Manual Download

695.00K

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DC1929A - Schematic Download

49.00K

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Evaluation Kits3

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DC2175A

LT3752IFE/LT8311IFE Demo Board | Forward Converter with Synchronous Rectification, 9V ≤ VIN ≤ 36V; VOUT = 12V @ 13A
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DC1994A

LT3752EFE/LT8311EFE Isolated Demo Board | 18V ≤ VIN ≤ 72V; VOUT: 12V @ 12A
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DC1929A

LT3752EFE-1/LT8311EFE Demo Board | 150V ≤ VIN ≤ 400V, VOUT = 12V @ 16.7A

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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LT3752/LT8311 Demo Circuit - Active Clamp Forward Converter with Synchronous Rectification (36-72V to 12V @ 12A) Download

13.00K

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LT3752-1/LT8311 Demo Circuit - 200W Active Clamp Forward Converter with Synchronous Rectification (150-400V to 12V @ 16.7A) Download

15.00K

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LT3752 - Switching Regulators Download

7.47 K

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LT8311 - Power Control, LT3752 - Switching Regulators Download

12.67 K

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