LT8311

PRODUCTION

Synchronous Rectifier Controller with Opto-Coupler Driver for Forward Converters

Data Sheet Product Selection Table
Part Models
8
1ku List Price
Starting From $3.67
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Part Details

  • Wide Input Supply Range: 3.7V to 30V
  • Preactive Mode:
    • No Pulse Transformer Required
    • DCM Operation at Light Load
  • SYNC Mode:
    • FCM or DCM Operation at Light Load
    • Achieves Highest Efficiency
  • 1.5% Feedback Voltage Reference
  • 10mA Opto-Coupler Driver
  • Output Power Good Indicator
  • Integrated Soft-Start Function
LT8311
Synchronous Rectifier Controller with Opto-Coupler Driver for Forward Converters
18V to 72V, 12V/8A Active Clamp Isolated Forward Converter Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 4

Technical Articles 3

Data Sheet

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

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Tools & Simulations

LTspice 3

Models for the following parts are available in LTspice:

  • LT8311
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
DC2175A

LT3752IFE/LT8311IFE Demo Board | Forward Converter with Synchronous Rectification, 9V ≤ VIN ≤ 36V; VOUT = 12V @ 13A

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Product Details

Demonstration circuit 2175A is an active clamp forward converter with synchronous rectification featuring the LT3752/LT8311 chipset.


This circuit was designed to demonstrate the high levels of performance, efficiency and high power. It operates at 200kHz and produces a regulated 12V, 13A output from a wide input voltage range of 9V to 36V, making it well suited for telecom, industrial, and other applications. Synchronous rectification helps to attain efficiency exceeding 93%.


 


eval board
schematic 2
schematic 3
schematic 4
schematic 5
DC1994A

LT3752EFE/LT8311EFE Isolated Demo Board | 18V ≤ VIN ≤ 72V; VOUT: 12V @ 12A

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Product Details

Demonstration circuit 1994A is an active clamp forward converter with synchronous rectification featuring the LT3752/LT8311 chipset. This circuit was designed to demonstrate the high levels of performance, efficiency, and small solution size attainable using these parts. It operates at 240kHz and produces a regulated 12V, 12A output from an input voltage range of 18 to 72V: suitable for telecom, industrial, and other applications. It has an eighth-brick footprint area. Synchronous rectification helps to attain efficiency exceeding 94%.

eval board
schematic 6
DC2015A

LT8310EFE/LT8311EFE Isolated Demo Board | 36V ≤ VIN ≤ 72V; VOUT = 12V @ 12A

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Product Details

Demonstration circuit 2015A is a resonant reset forward converter with synchronous rectification featuring the LT8310/LT8311 chipset. This circuit was designed to demonstrate the high levels of performance, efficiency, and small solution size attainable using these parts. It operates at 240kHz and produces a regulated 12V, 12A output from an input voltage range of 36V to 72V: suitable for telecom, industrial, and other applications. It has an eighth-brick footprint area. Synchronous rectification helps to attain efficiency exceeding 94%.

eval board
schematic 7
DC1929A

LT3752EFE-1/LT8311EFE Demo Board | 150V ≤ VIN ≤ 400V, VOUT = 12V @ 16.7A

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Product Details

Demonstration circuit 1929A is a 200W active clamp forward converter featuring the LT3752-1/LT8311 chipset. The LT8311 is a secondary-side synchronous rectifier controller. The solution operates at about 100kHz and produces an isolated, regulated 12V / 16.7A output from an input voltage ranging from 150V to 400V, making it well suited for automotive, industrial, and other applications.


 
DC2175A
LT3752IFE/LT8311IFE Demo Board | Forward Converter with Synchronous Rectification, 9V ≤ VIN ≤ 36V; VOUT = 12V @ 13A
DC2175A - Schematic
DC1994A
LT3752EFE/LT8311EFE Isolated Demo Board | 18V ≤ VIN ≤ 72V; VOUT: 12V @ 12A
DC1994A Evaluation Board DC1994A Evaluation Board - Top View DC1994A Evaluation Board - Bottom View DC1994A - Schematic
DC2015A
LT8310EFE/LT8311EFE Isolated Demo Board | 36V ≤ VIN ≤ 72V; VOUT = 12V @ 12A
DC2015A - Schematic
DC1929A
LT3752EFE-1/LT8311EFE Demo Board | 150V ≤ VIN ≤ 400V, VOUT = 12V @ 16.7A
DC1929A - Schematic

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