LT1681
PRODUCTIONDual Transistor Synchronous Forward Controller
- Part Models
- 4
- 1ku List Price
- Starting From $7.59
Overview
- 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
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
Documentation
Data Sheet 1
Design Note 1
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 |
|---|---|---|---|
| LT1681ESW#PBF | 20-Lead SOIC (Wide 0.3 Inch) | ||
| LT1681ESW#TRPBF | 20-Lead SOIC (Wide 0.3 Inch) | ||
| LT1681ISW#PBF | 20-Lead SOIC (Wide 0.3 Inch) | ||
| LT1681ISW#TRPBF | 20-Lead SOIC (Wide 0.3 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Aug 10, 2022 - 22_0176 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 | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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LTspice
Models for the following parts are available in LTspice:
- LT1681
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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