LT1681
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LT1681

Dual Transistor Synchronous Forward Controller

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Part Details
Part Models 4
1ku List Price Starting From $6.00
Features
  • High Voltage: Operation Up to 72V
  • Synchronizable Operating Frequency and Output Switch Phase for Multiple Controller Systems
  • Fixed Frequency Operation to 350kHz
  • Adaptive and Adjustable Blanking
  • Synchronous Rectifier Driver
  • Local 1% Voltage Reference
  • Undervoltage Lockout Protection with Hysteresis
  • Input Overvoltage Protection
  • Programmable Start Inhibit
  • Transformer Primary Saturation Protection
  • Optocoupler Feedback Support
  • Soft-Start Control
Additional Details
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The LT1681 controller simplifies the design of high power synchronous dual transistor forward DC/DC converters. The part employs fixed frequency current mode control and supports both isolated and nonisolated topologies. The IC drives external N-channel power MOSFETs and operates with input voltages up to 72V.

The LT1681’s operating frequency is programmable and can be synchronized up to 350kHz. Switch phase is also controlled during synchronized operation to accommodate multiple converter systems. Internal logic guarantees 50% maximum duty cycle operation to prevent transformer saturation.

The LT1681 incorporates a soft-start feature that provides a controlled increase in supplied current during start-up and after an undervoltage lockout or overvoltage/overcurrent event.

The part is available in a 20-lead wide SO package to support high voltage pin-to-pin clearance.

Applications

  • Isolated Telecommunication Systems
  • Personal Computers and Peripherals
  • Lead Acid Battery Backup Systems
  • Automotive and Heavy Equipment
Part Models 4
1ku List Price Starting From $6.00

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Aug 10, 2022

- 22_0176

Laser Top Mark Conversion for SOIC_W Packages Assembled in ADPG [PNG] and UTL

LT1681ESW#PBF

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LT1681ESW#TRPBF

PRODUCTION

LT1681ISW#PBF

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LT1681ISW#TRPBF

PRODUCTION

Filter by Model

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Part Models

Product Lifecycle

PCN

Aug 10, 2022

- 22_0176

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Laser Top Mark Conversion for SOIC_W Packages Assembled in ADPG [PNG] and UTL

LT1681ESW#PBF

PRODUCTION

LT1681ESW#TRPBF

PRODUCTION

LT1681ISW#PBF

PRODUCTION

LT1681ISW#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Tools & Simulations

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.

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