LTC3705
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LTC3705

2-Switch Forward Controller and Gate Driver

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warning : NOT RECOMMENDED FOR NEW DESIGNS tooltip
warning : NOT RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
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
Part Models 4
1ku List Price Starting From $3.17

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3705EGN#PBF
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LTC3705EGN#TRPBF
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LTC3705IGN#PBF
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LTC3705IGN#TRPBF
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Product Lifecycle

PCN

Oct 11, 2022

- 22_0235

Epoxy Change from Henkel 8290 to 8290A for GN Package

LTC3705EGN#PBF

PRODUCTION

LTC3705EGN#TRPBF

PRODUCTION

LTC3705IGN#PBF

PRODUCTION

LTC3705IGN#TRPBF

PRODUCTION

Apr 6, 2022

- 22_0066

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

LTC3705EGN#PBF

PRODUCTION

LTC3705EGN#TRPBF

PRODUCTION

LTC3705IGN#PBF

PRODUCTION

LTC3705IGN#TRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0235

arrow down

Epoxy Change from Henkel 8290 to 8290A for GN Package

LTC3705EGN#PBF

PRODUCTION

LTC3705EGN#TRPBF

PRODUCTION

LTC3705IGN#PBF

PRODUCTION

LTC3705IGN#TRPBF

PRODUCTION

Apr 6, 2022

- 22_0066

arrow down

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

LTC3705EGN#PBF

PRODUCTION

LTC3705EGN#TRPBF

PRODUCTION

LTC3705IGN#PBF

PRODUCTION

LTC3705IGN#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

reference details image

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

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

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.

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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