LTC3725

NOT RECOMMENDED FOR NEW DESIGNS

Single-Switch Forward Controller and Gate Driver

Data Sheet Product Selection Table
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Overview

  • High Speed Gate Driver for Forward Converter
  • On-Chip Rectifier and Self-Starting Architecture Eliminates Need for Separate Gate Drive Bias Supply
  • Wide Input Voltage Supply Range: 9V and Up
  • Linear Regulator Controller for Fast Start-Up
  • Precision UVLO with Adjustable Hysteresis
  • Overcurrent Protection
  • Volt-Second Limit Prevents Transformer Core Saturation
  • Voltage Feedforward for Fast Transient Response
  • Available in 10-Lead MSOP Package
LTC3725
Single-Switch Forward Controller and Gate Driver
36V-72V to 3.3V/30A Isolated Single-Switch Forward Converter Product Package 1
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Documentation

Data Sheet 1

User Guide 13

Design Note 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Switching Regulators & Controllers 2
LTM8047
RECOMMENDED FOR NEW DESIGNS 3.1VIN to 32VIN Isolated μModule (Power Module) DC/DC Converter
LTM8048
RECOMMENDED FOR NEW DESIGNS 3.1VIN to 32VIN Isolated μModule (Power Module) DC/DC Converter with LDO Post Regulator
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3725
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
DC1031A-A

LTC3725EMSE/LTC3726EGN Demo Board | Single-Switch Forward Converter, 36V ≤ VIN ≤ 72V, VOUT = 2.5V @ 20A

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Product Details

Demonstration circuit 1031A-A is a 36V-72Vin, synchronous forward converter featuring the LTC3725 forward converter and the LTC3726 secondary-side controller. This circuit was designed specifically to attain a high current, low ripple, synchronously rectified forward converter to efficiently power 2.5V loads at up to 20A from a typical telecom input voltage range. This circuit features secondary side control of the supply eliminating the need for an optocoupler.



eval board
schematic 2
DC1031A-B

LTC3725EMSE/LTC3726EGN Demo Board | Single-Switch Forward Converter, 36V ≤ VIN ≤ 72V, VOUT = 3.3V @ 20A

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Product Details

Demonstration circuit 1031A-B is a 36V-72Vin, synchronous forward converter featuring the LTC3725 forward converter and the LTC3726 secondary-side controller. This circuit was designed specifically to attain a high current, low ripple, synchronously rectified forward converter to efficiently power 3.3V loads at up to 20A from a typical telecom input voltage range. This circuit features secondary side control of the supply eliminating the need for an optocoupler.



eval board
schematic 3
DC1031A-C

LTC3725EMSE/LTC3726EGN Demo Board | Single-Switch Forward Converter, 36V ≤ VIN ≤ 72V, VOUT = 5V @ 20A

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Product Details

Demonstration circuit 1031A-C is a 36V-72Vin, synchronous forward converter featuring the LTC3725 forward converter and the LTC3726 secondary-side controller. This circuit was designed specifically to attain a high current, low ripple, synchronously rectified forward converter to efficiently power 5V loads at up to 20A from a typical telecom input voltage range. This circuit features secondary side control of the supply eliminating the need for an optocoupler.



eval board
schematic 4
DC1032A

LTC3725EMSE/LTC3726EGN 1/8 Brick | 36V < VIN < 72V, VOUT: 12V/10A

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Product Details

DC1032A - Demo Board for:
LTC3725 - Single-Switch Forward Controller and Gate Driver
LTC3726 - Secondary-Side Synchronous Forward Controller



eval board
schematic 5
DC1174A-A

LTC3725EMSE/LTC3726EGN 1/8 Brick | 9V < VIN < 36V, VOUT: 5.0V/10A

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Product Details

DC1174A-A: Demo Board for the LTC3725 Single-Switch Forward Controller and Gate Driver and LTC3726 Secondary-Side Synchronous Forward Controller

eval board
schematic 6
DC1174A-B

LTC3725EMSE/LTC3726EGN 1/8 Brick | 9V < VIN < 36V, VOUT: 12V/4A

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Product Details

DC1174A-B: Demo Board for the LTC3725 Single-Switch Forward Controller and Gate Driver and LTC3726 Secondary-Side Synchronous Forward Controller

eval board
schematic 7
DC1174A-C

LTC3725EMSE/LTC3726EGN 1/8 Brick | 9V < VIN < 36V, VOUT: 15V/3A

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Product Details

DC1174A-C: Demo Board for the LTC3725 Single-Switch Forward Controller and Gate Driver and LTC3726 Secondary-Side Synchronous Forward Controller

eval board
schematic 8
DC1300A-A

LTC3725EMSE/LTC3726EGN 1/4 Brick | 9V < VIN < 36V, VOUT: 5.0V/20A

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Product Details

DC1300A-A: Demo Board for:

LTC3725 - Single-Switch Forward Controller and Gate Driver
LTC3726 - Secondary-Side Synchronous Forward Controller


 


eval board
schematic 9
DC1300A-B

LTC3725EMSE/LTC3726EGN 1/4 Brick | 9V < VIN < 36V, VOUT: 12V/8.4A

Buy Now View Details

Product Details

DC1300A-B: Demo Board for:

LTC3725 - Single-Switch Forward Controller and Gate Driver
LTC3726 - Secondary-Side Synchronous Forward Controller


 


eval board
schematic 10
DC1300A-C

LTC3725EMSE/LTC3726EGN 1/4 Brick | 9V < VIN < 36V, VOUT: 15V/6.7A

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Product Details

DC1300A-C: Demo Board for:

LTC3725 - Single-Switch Forward Controller and Gate Driver
LTC3726 - Secondary-Side Synchronous Forward Controller


 


eval board
schematic 11
DC888A-B

LTC3725EMSE/LTC3706EGN Demo Board | 1/4 Brick, 36V ≤ VIN ≤ 72V, VOUT: 5V/40A

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Product Details

Demonstration circuit 888A-B is a high power isolated synchronous forward converter with synchronous secondary side control featuring the LTC3725 and LTC3706. When powered from a 36-72V input, a single DC888A-B provides an isolated 5V at 40A in a quarter-brick footprint. If higher output current is required, multiple DC888A boards may be stacked together using on-board connectors for a complete PolyPhase current sharing solution.

eval board
schematic 12
DC888A-C

LTC3725EMSE/LTC3706EGN Demo Board | 1/4 Brick, 36V ≤ VIN ≤ 72V, VOUT: 12V/20A

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Product Details

Demonstration circuit 888A-C is a high power isolated synchronous forward converter with synchronous secondary side control featuring the LTC3725 and LTC3706. When powered from a 36-72V input, a single DC888A-C provides an isolated 12V at 20A in a quarter-brick footprint. If higher output current is required, multiple DC888A boards may be stacked together using on-board connectors for a complete PolyPhase current sharing solution.

eval board
schematic 13
DC888A-A

LTC3725EMSE/LTC3706EGN Demo Board | 1/4 Brick, 36V ≤ VIN ≤ 72V, VOUT: 3.3V/50A

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Product Details

Demonstration circuit 888A-A is a high power isolated synchronous forward converter with synchronous secondary side control featuring the LTC3725 and LTC3706. When powered from a 36-72V input, a single DC888A-A provides an isolated 3.3V at 50A in a quarter-brick footprint. If higher output current is required, multiple DC888A boards may be stacked together using on-board connectors for a complete PolyPhase current sharing solution.
DC1031A-A
LTC3725EMSE/LTC3726EGN Demo Board | Single-Switch Forward Converter, 36V ≤ VIN ≤ 72V, VOUT = 2.5V @ 20A
DC1031A-A - Schematic
DC1031A-B
LTC3725EMSE/LTC3726EGN Demo Board | Single-Switch Forward Converter, 36V ≤ VIN ≤ 72V, VOUT = 3.3V @ 20A
DC1031A-B - Schematic
DC1031A-C
LTC3725EMSE/LTC3726EGN Demo Board | Single-Switch Forward Converter, 36V ≤ VIN ≤ 72V, VOUT = 5V @ 20A
DC1031A-C - Schematic
DC1032A
LTC3725EMSE/LTC3726EGN 1/8 Brick | 36V < VIN < 72V, VOUT: 12V/10A
DC1032A - Schematic
DC1174A-A
LTC3725EMSE/LTC3726EGN 1/8 Brick | 9V < VIN < 36V, VOUT: 5.0V/10A
DC1174A-A - Schematic
DC1174A-B
LTC3725EMSE/LTC3726EGN 1/8 Brick | 9V < VIN < 36V, VOUT: 12V/4A
DC1174A-B - Schematic
DC1174A-C
LTC3725EMSE/LTC3726EGN 1/8 Brick | 9V < VIN < 36V, VOUT: 15V/3A
DC1174A-C - Schematic
DC1300A-A
LTC3725EMSE/LTC3726EGN 1/4 Brick | 9V < VIN < 36V, VOUT: 5.0V/20A
DC1300A-A - Schematic
DC1300A-B
LTC3725EMSE/LTC3726EGN 1/4 Brick | 9V < VIN < 36V, VOUT: 12V/8.4A
DC1300A-B - Schematic
DC1300A-C
LTC3725EMSE/LTC3726EGN 1/4 Brick | 9V < VIN < 36V, VOUT: 15V/6.7A
DC1300A-C - Schematic
DC888A-B
LTC3725EMSE/LTC3706EGN Demo Board | 1/4 Brick, 36V ≤ VIN ≤ 72V, VOUT: 5V/40A
DC888A-A - Schematic
DC888A-C
LTC3725EMSE/LTC3706EGN Demo Board | 1/4 Brick, 36V ≤ VIN ≤ 72V, VOUT: 12V/20A
DC888A-A - Schematic
DC888A-A
LTC3725EMSE/LTC3706EGN Demo Board | 1/4 Brick, 36V ≤ VIN ≤ 72V, VOUT: 3.3V/50A
DC888A-A - Schematic

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