LTC3706
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LTC3706

Secondary-Side Synchronous Forward Controller with Polyphase Capability

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LTspice LTC3706 - Switching Regulators Download 3.94 KB
Part Models 4
1ku List Price Starting From $4.69
Features
  • Secondary-Side Control for Fast Transient Response
  • Self-Starting Architecture Eliminates Need for Separate Bias Regulator
  • Proprietary Gate Drive Encoding Scheme Reduces System Complexity
  • PolyPhase® Operation Reduces CIN Requirements
  • Current Mode Control Ensures Current Sharing
  • PLL Fixed Frequency: 100kHz to 500kHz
  • ±1% Output Voltage Accuracy
  • True Remote Sense Differential Amplifier
  • Power Good Output Voltage Monitor
  • High Voltage Linear Regulator Controller
  • Wide Supply Range: 5V to 30V
  • Available in a Narrow 24-Lead SSOP Package
Additional Details
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The LTC3706 is a PolyPhase capable secondary-side controller for synchronous forward converters. When used in conjunction with the LTC3705 gate driver and primary-side controller, the part creates a complete isolated power supply that combines the power of PolyPhase operation with the speed of secondary-side control.

The LTC3706 has been designed to simplify the design of highly efficient, secondary-side forward converters. Working in concert with the LTC3705, the LTC3706 forms a robust, self-starting converter that eliminates the need for the separate bias regulator that is commonly used in secondary-side control applications. In addition, a proprietary scheme is used to multiplex gate drive signals and DC bias power across the isolation barrier through a single, tiny pulse transformer.

The LTC3706 provides remote sensing, accurate power good and overvoltage monitoring circuits to support precision, high current applications. A linear regulator controller with thermal protection is also provided to simplify the generation of secondary-side bias voltage.

The LTC3706 is available in a 24-lead SSOP package.

Applications

  • Isolated 48V Telecommunication Systems
  • Internet Servers and Routers
  • Distributed Power Step-Down Converters
  • Automotive and Heavy Equipment
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Documentation View All Documentation
LTspice LTC3706 - Switching Regulators Download 3.94 KB
Part Models 4
1ku List Price Starting From $4.69
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LTC3706

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Data Sheet

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UPDATED 07/19/2011
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LTC3706: Secondary-Side Synchronous Forward Controller with Polyphase Capability Data Sheet

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UPDATED 09/21/2011
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LTC3706: PolyPhaseが可能な2次側同期整流式フォワード･コントローラ データシート

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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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DN377 - 降圧コンバータの単純さと性能を備えた絶縁コンバータ redirect icon

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User Guide

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UPDATED 09/24/2009
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DC776A - Demo Manual redirect icon

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UPDATED 02/19/2011
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DC888A-A - Demo Manual redirect icon

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Documentation

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
LTC3706EGN#PBF 24-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3706EGN#TRPBF 24-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3706IGN#PBF 24-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3706IGN#TRPBF 24-Lead SSOP (Narrow 0.15 Inch) external-link
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Aug 10, 2022

- 22_0177

Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL

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Aug 10, 2022

- 22_0177

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Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL

LTC3706EGN#PBF

PRODUCTION

LTC3706EGN#TRPBF

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Software & Part Ecosystem

Software & Part Ecosystem

Parts Product Life Cycle Description
LTC3766
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RECOMMENDED FOR NEW DESIGNS

High Efficiency, Secondary-Side Synchronous Forward Controller

Evaluation Kit

Evaluation Kits 4

reference details image

DC888A-B

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

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DC888A-B

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

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Download

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DC888A-B
LTC3725EMSE/LTC3706EGN Demo Board | 1/4 Brick, 36V ≤ VIN ≤ 72V, VOUT: 5V/40A
Buy Now View Details

Product Detail

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.

Resources

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PDF

DC888A - Schematic Download

52.00K

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ZIP

DC888A-B - Design File Download

1.00M

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PDF

DC888A-B - Demo Manual Download

1.00M

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reference details image

DC888A-A

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

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DC888A-A

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

download icon

Download

 print icon

Print
DC888A-A
LTC3725EMSE/LTC3706EGN Demo Board | 1/4 Brick, 36V ≤ VIN ≤ 72V, VOUT: 3.3V/50A
Buy Now View Details

Product Detail

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.

Resources

pdf icon

PDF

DC888A - Schematic Download

52.00K

pdf icon

PDF

DC888A-A - Demo Manual Download

1.00M

pdf icon

ZIP

DC888A-A - Design File Download

1.00M

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reference details image

DC888A-C

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

zoom

DC888A-C

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

download icon

Download

 print icon

Print
DC888A-C
LTC3725EMSE/LTC3706EGN Demo Board | 1/4 Brick, 36V ≤ VIN ≤ 72V, VOUT: 12V/20A
Buy Now View Details

Product Detail

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.

Resources

pdf icon

PDF

DC888A - Schematic Download

52.00K

pdf icon

ZIP

DC888A-C - Design File Download

1.00M

pdf icon

PDF

DC888A-C - Demo Manual Download

1.00M

Show More Arrow image
reference details image

DC776A

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

zoom

DC776A

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

download icon

Download

 print icon

Print
DC776A
LTC3705EGN/LTC3706EGN Demo Board | Forward Converter with Secondary Side Control, 36V ≤ VIN ≤72V, VOUT = 1.5V @ 45A
Buy Now View Details

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

pdf icon

ZIP

DC776A - Design File Download

1.00M

pdf icon

PDF

DC776A - Demo Manual Download

716.00K

pdf icon

PDF

DC776A - Schematic Download

47.00K

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Evaluation Kits4

evaluation kit item images

DC888A-B

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

DC888A-A

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

DC888A-C

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

DC776A

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

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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LTC3706 - Switching Regulators Download

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