LTC3900

PRODUCTION

Synchronous Rectifier Driver for Forward Converters

Data Sheet Product Selection Table
Part Models
8
1ku List Price
Starting From $3.32
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Part Details

  • 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
LTC3900
Synchronous Rectifier Driver for Forward Converters
Simplified Isolated Synchronous Forward Converter Efficiency Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 7

Technical Articles 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LTC3900
LTspice

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.

Evaluation Kits

eval board
schematic 1
DC1317A-G

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

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Product Details

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.


 


eval board
schematic 2
DC677A

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

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Product Details

DC677A: Demo Board for the LTC3900 Synchronous Rectifier Driver for Forward Converters.


 


eval board
schematic 3
DC968A-B

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

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Product Details

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

eval board
schematic 4
DC968A-C

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

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Product Details

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

eval board
schematic 5
DC968A-A

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

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Product Details

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


 


eval board
schematic 6
DC968A-D

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

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Product Details

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

eval board
schematic 7
DC1317A-C

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

Buy Now View Details

Product Details

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.

DC1317A-G
LT1952EGN-1/LTC3900 Demo Board | Active Reset, VIN=9V-36V VOUT=12V @ 5A
DC1317A-G - Schematic
DC677A
LT1952-1EGN-1, LTC3900ES Demo Board | VIN=36V-75V, VOUT=3.3V @ 50A
DC677A - Schematic
DC968A-B
LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 18V-36V, VOUT = 5V @ 20A
DC968A-B - Schematic
DC968A-C
OBSOLETE: LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 36V-75V, VOUT = 12V @ 12A
DC968A-C - Schematic
DC968A-A
LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 34V-75V VOUT = 3.3V @ 30A
DC968A-A - Schematic
DC968A-D
LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 36V-75V, VOUT = 28V @ 4A
DC968A-D - Schematic
DC1317A-C
LT1952EGN-1/LTC3900 Demo Board | Active Reset, VIN=18V-72V VOUT=12V @ 10A
DC1317A-C - Schematic

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6 Years Ago
DC1317A eval board
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