LTC3900
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LTC3900

Synchronous Rectifier Driver for Forward Converters

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Models 8
1ku List Price Starting From $3.32
Features
  • N-Channel Synchronous Rectifier MOSFET Driver
  • Programmable Timeout Protection
  • Reverse Inductor Current Protection
  • Pulse Transformer Synchronization
  • Wide VCC Supply Range: 4.5V to 11V
  • 15ns Rise/Fall Times at VCC = 5V, CL = 4700pF
  • Undervoltage Lockout
  • Small SO-8 Package
Additional Details
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The LTC3900 is a secondary-side synchronous rectifier driver designed to be used in isolated forward converter power supplies. The chip drives N-channel rectifier MOSFETs and accepts pulse sychronization from the primary-side controller via a pulse transformer.

The LTC3900 incorporates a full range of protection for the external MOSFETs. A programmable timeout function is included that disables both drivers when the synchronization signal is missing or incorrect. Additionally, the chip senses the output inductor current through the drainsource resistance of the catch MOSFET, shutting off the MOSFET if the inductor current reverses. The LTC3900 also shuts off the drivers if the supply voltage is too low.

Applications

  • 48V Input Isolated DC/DC Converters
  • Isolated Telecom Power Supplies
  • High Voltage Distributed Power 
  • Step-Down Converters
  • Industrial Control System Power Supplies
  • Automotive and Heavy Equipment
Part Models 8
1ku List Price Starting From $3.32

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Documentation

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

PCN

Oct 12, 2022

- 22_0255

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

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PRODUCTION

Jun 16, 2021

- 21_0026

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

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Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Oct 12, 2022

- 22_0255

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Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

LTC3900ES8#PBF

PRODUCTION

LTC3900ES8#TRPBF

PRODUCTION

LTC3900HS8#PBF

PRODUCTION

LTC3900HS8#TRPBF

PRODUCTION

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PRODUCTION

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PRODUCTION

LTC3900MPS8#PBF

PRODUCTION

LTC3900MPS8#TRPBF

PRODUCTION

Jun 16, 2021

- 21_0026

arrow down

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LTC3900ES8#PBF

PRODUCTION

LTC3900ES8#TRPBF

PRODUCTION

LTC3900HS8#PBF

PRODUCTION

LTC3900HS8#TRPBF

PRODUCTION

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Software & Part Ecosystem

Evaluation Kits 7

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DC1317A-G

LT1952EGN-1/LTC3900 Demo Board | Active Reset, VIN=9V-36V VOUT=12V @ 5A

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DC1317A-G

LT1952EGN-1/LTC3900 Demo Board | Active Reset, VIN=9V-36V VOUT=12V @ 5A

LT1952EGN-1/LTC3900 Demo Board | Active Reset, VIN=9V-36V VOUT=12V @ 5A

Product Detail

Demonstration circuit 1317A-G is an isolated input to high current output 1/8th brick footprint synchronous forward converter featuring the LT1952 switching controller with Active Reset circuit. The Active Reset circuit can improve the efficiency in wide input voltage applications. Also, the Active Reset allows the implementation of self-driven synchronous secondary rectifiers in some applications. The DC1317A-G converts an isolated 9V to 36V input to 12V at 5A of output current.


 


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DC677A

LT1952-1EGN-1, LTC3900ES Demo Board | VIN=36V-75V, VOUT=3.3V @ 50A

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DC968A-B

LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 18V-36V, VOUT = 5V @ 20A

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DC968A-B

LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 18V-36V, VOUT = 5V @ 20A

LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 18V-36V, VOUT = 5V @ 20A

Product Detail

DC968A-B Demo Board for:
LT1952 Single Switch Synchronous Forward Controller
LTC3900 Synchronous Rectifier Driver for Forward Converters
LT4430 Secondary-Side Optocoupler Driver

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DC968A-C

OBSOLETE: LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 36V-75V, VOUT = 12V @ 12A

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DC968A-C

OBSOLETE: LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 36V-75V, VOUT = 12V @ 12A

OBSOLETE: LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 36V-75V, VOUT = 12V @ 12A

Product Detail

This evaluation board is obsolete and no longer recommended. The replacement board is the DC1317A-C.

DC968A-C Demo Board for:
LT1952 Single Switch Synchronous Forward Controller
LTC3900 Synchronous Rectifier Driver for Forward Converters
LT4430 Secondary-Side Optocoupler Driver

reference details image

DC968A-A

LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 34V-75V VOUT = 3.3V @ 30A

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DC968A-A

LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 34V-75V VOUT = 3.3V @ 30A

LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 34V-75V VOUT = 3.3V @ 30A

Product Detail

DC968A-A Demo Board for:
LT1952 Single Switch Synchronous Forward Controller
LTC3900 Synchronous Rectifier Driver for Forward Converters
LT4430 Secondary-Side Optocoupler Driver


 


reference details image

DC968A-D

LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 36V-75V, VOUT = 28V @ 4A

zoom

DC968A-D

LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 36V-75V, VOUT = 28V @ 4A

LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 36V-75V, VOUT = 28V @ 4A

Product Detail

DC968A-D Demo Board for:
LT1952 Single Switch Synchronous Forward Controller
LTC3900 Synchronous Rectifier Driver for Forward Converters
LT4430 Secondary-Side Optocoupler Driver

reference details image

DC1317A-C

LT1952EGN-1/LTC3900 Demo Board | Active Reset, VIN=18V-72V VOUT=12V @ 10A

zoom

DC1317A-C

LT1952EGN-1/LTC3900 Demo Board | Active Reset, VIN=18V-72V VOUT=12V @ 10A

LT1952EGN-1/LTC3900 Demo Board | Active Reset, VIN=18V-72V VOUT=12V @ 10A

Product Detail

Demonstration circuit 1317A-C is isolated input to high current output 1/8th brick footprint synchronous forward converter featuring the LT1952 switching controller with Active Reset circuit. The Active Reset circuit can improve the efficiency in wide input voltage applications. Also, the Active Reset allows the implementation of self-driven synchronous secondary rectifiers in some applications. The DC1317A-C converts isolated 18V to 72V input to 12V output and provides over 12A of output current depending on cooling.

When determining the cooling requirements the actual input voltage range and continuous maximum output current must be taken into account. The converter operates at 300kHz with the peak efficiency greater than 94%. The DC1317 can be easily modified to generate output voltages in the range from 0.6V to 48V. The output currents are limited by total output power of up to 150W.

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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