LT3753

RECOMMENDED FOR NEW DESIGNS

Active Clamp Synchronous Forward Controller

Data Sheet (Rev. C) Product Selection Table
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Overview

  • 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
LT3753
Active Clamp Synchronous Forward Controller
LT3753 Application Circuit LT3753 Pin Configuration
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Documentation

Data Sheet 1

User Guide 3

Technical Articles 5

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
LT3752 LT3752-1
Active Clamp Synchronous Forward Controllers with Internal Housekeeping Controller
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3753
LTspice

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.

Evaluation Kits

eval board
schematic 1
DC2324A-B

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

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Product Details

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).

eval board
schematic 2
DC2050A

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

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Product Details

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%.

eval board
schematic 3
schematic 4
schematic 5
schematic 6
DC2324A-A

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

Buy Now View Details

Product Details

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).

eval board
schematic 7
DC2324A-C

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

Buy Now View Details

Product Details

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).


 


eval board
schematic 8
schematic 9
schematic 10
schematic 11
DC2306A

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

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Product Details

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.


 
DC2324A-B
LT3753EFE Demo Board | Isolated Forward Converter, 18V ≤ VIN ≤ 36V; VOUT = 24V @ 5A
DC2324A - Schematic
DC2050A
LT3753EFE Isolated Demo Board | Synchronous Forward Controller with Active Clamp, 36V ≤ VIN ≤ 72V; VOUT = 5V @ 20A
DC2050A - Schematic
DC2324A-A
LT3753EFE Demo Board | Isolated Forward Converter, 36V ≤ VIN ≤ 72V; VOUT = 24V @ 5A
DC2324A-B Evaluation Board DC2324A-B Evaluation Board - Top View DC2324A-B Evaluation Board - Bottom View DC2324A - Schematic
DC2324A-C
LT3753EFE Isolated Demo Board | Sync Forward Controller with Active Clamp, 9V ≤ VIN ≤ 18V; VOUT = 24V @ 4A
DC2324A - Schematic
DC2306A
LT3753EFE Isolated Demo Board | Forward Converter, 10V ≤ VIN ≤ 54V; VOUT = 48V or 54V (Jumper Selectable) @ 1.5A
DC2306A Evaluation Board DC2306A Evaluation Board - Top View DC2306A Evaluation Board - Bottom View DC2306A - Schematic

Reference Designs

ADPS43895-RD power tree
ADPS43895-RD power tree
adps43895-rd board illustration
ADPS43895-RD Industrial Power Solution Circuits from the lab

100W Half-Brick Isolated Power Device for Power Sourcing Equipment Applications

View Detailed Reference Design

Features and Benefits

  • Wide input voltage range of 9-48V ensures compatibility with diverse and common power sources (12V/24V/48V).
  • Active clamp topology achieves efficiency greater than 90% at 100W of power and nominal Vin conditions.
  • Energy loss minimized and thermal performance improved, reducing operating costs and enhancing system reliability.
  • Standard half-brick form factor (2.3in x 2.4in) simplifies system integration, saves space, and reduces design complexity.
  • Strong isolation (2200Vac) provides superior safety and protection for sensitive equipment.

Solution Specifications

Electrical Requirements:

  • External Input Voltage: 9 VDC – 48 VDC (12 V / 24 V / 48 V nominal)
  • Output Voltage: 54 VDC
  • Output Current: 2 A
  • Output Power: 100 W
  • Load Regulation: ± 1%
  • Maximum Output Ripple: 250 mVPP
  • Transient Response: ± 5% (50% to 100% Load Step)
  • Isolation: 2200 VAC

Performance Requirements:

  • Efficiency: ≥ 90%

Mechanical Requirements:

  • Transformer Type: Planar, Off-the-shelf
  • Form Factor: Half-Brick size
ADPS43895-RD Industrial Power Solution
100W Half-Brick Isolated Power Device for Power Sourcing Equipment Applications
ADPS43895-RD power tree
adps43895-rd board illustration

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