LTC3705
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LTC3705

2-Switch Forward Controller and Gate Driver

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LTspice LTC3705 - Switching Regulators, LT1431 - Voltage References Download 7.24 KB
Part Models 4
1ku List Price Starting From $3.17
Features
  • High-Speed Top and Bottom Gate Drivers for
  • 2-Switch Forward Converter
  • On-Chip Rectifier and Self-Starting Architecture
  • Eliminate Need for Separate Gate Drive Bias Supply
  • Wide Input Voltage Supply Range: 18V to 80V
  • Tolerant of 100V Input Voltage Transients
  • 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 16-Lead Narrow SSOP Package
Additional Details
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The LTC3705 is a controller for a 2-switch forward converter and includes on-chip bottom and top gate drivers that do not require external transformers. For secondary-side control, combine the LTC3705 with the LTC3706 PolyPhase® secondary-side synchronous forward controller to create a complete forward converter using a minimum of discrete parts. A proprietary scheme is used to multiplex gate drive signals across the isolation barrier through a tiny pulse transformer. The on-chip rectifier and the same pulse transformer provide gate drive bias power.

Alternatively, the LTC3705 can be used as a standalone voltage mode controller in a primary-side control architecture with optoisolator feedback. Voltage feedforward provides excellent line regulation and transient response.

Applications

  • Isolated 48V Telecommunication Systems
  • Internet Servers and Routers
  • Distributed Power Step-Down Converters
  • Automotive and Heavy Equipment
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file View Data Sheet
Documentation View All Documentation
LTspice LTC3705 - Switching Regulators, LT1431 - Voltage References Download 7.24 KB
Part Models 4
1ku List Price Starting From $3.17
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LTC3705

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Data Sheet

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UPDATED 11/09/2007
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LTC3705: 2-Switch Forward Controller and Gate Driver Data Sheet

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Reliability Data

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UPDATED 03/22/2018
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Design Note

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UPDATED 04/01/2014
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DN377 - Isolated Converters Have Buck Simplicity and Performance redirect icon

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UPDATED 04/20/2006
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UPDATED 09/24/2009
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DC776A - Demo Manual redirect icon

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Documentation

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
LTC3705EGN#PBF 16-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3705IGN#PBF 16-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3705IGN#TRPBF 16-Lead SSOP (Narrow 0.15 Inch) external-link
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Oct 3, 2024

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(QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking

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Delta Qualification Matrix

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Oct 11, 2022

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Epoxy Change from Henkel 8290 to 8290A for GN Package

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Apr 6, 2022

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Laser Top Mark for 16QSOP Assembled in ADPG [PNG]

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Oct 3, 2024

- 24_0235

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(QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking

LTC3705EGN#PBF

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LTC3705EGN#TRPBF

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LTC3705IGN#PBF

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LTC3705IGN#TRPBF

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Oct 11, 2022

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Epoxy Change from Henkel 8290 to 8290A for GN Package

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LTC3705EGN#TRPBF

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LTC3705IGN#PBF

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Material_Report

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Apr 6, 2022

- 22_0066

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Laser Top Mark for 16QSOP Assembled in ADPG [PNG]

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Software & Part Ecosystem

Parts Product Life Cycle Description
LTC3765
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RECOMMENDED FOR NEW DESIGNS

Active Clamp Forward Controller and Gate Driver

Evaluation Kits 1

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DC776A

LTC3705EGN/LTC3706EGN Demo Board | Forward Converter with Secondary Side Control, 36V ≤ VIN ≤72V, VOUT = 1.5V @ 45A

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DC776A

LTC3705EGN/LTC3706EGN Demo Board | Forward Converter with Secondary Side Control, 36V ≤ VIN ≤72V, VOUT = 1.5V @ 45A

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DC776A
LTC3705EGN/LTC3706EGN Demo Board | Forward Converter with Secondary Side Control, 36V ≤ VIN ≤72V, VOUT = 1.5V @ 45A
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Product Detail

Demonstration circuit 776 is a 36V-72VIN, 2-switch forward converter with synchronous secondary-side control featuring the LTC3705 and LTC3706. This circuit was designed specifically to attain a high stepdown ratio power supply in one stage in order to efficiently power 1.5V loads from a typical telecom input voltage range. Isolation voltage is 1500VDC. This circuit features secondary-side control of the supply without the need of an optocoupler.

Resources

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DC776A - Demo Manual Download

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DC776A - Design File Download

1.00M

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DC776A - Schematic Download

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Evaluation Kits1

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DC776A

LTC3705EGN/LTC3706EGN Demo Board | Forward Converter with Secondary Side Control, 36V ≤ VIN ≤72V, VOUT = 1.5V @ 45A

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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LTC3705 - Switching Regulators, LT1431 - Voltage References Download

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