LT3748

PRODUCTION

100V Isolated Flyback Controller

Data Sheet (Rev. D) Product Selection Table
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Overview

  • 5V to 100V Input Voltage Range
  • 1.9A Average Gate Drive Source and Sink Current
  • Boundary Mode Operation
  • No Transformer Third Winding or Opto-Isolator Required for Regulation
  • Primary-Side Winding Feedback Load Regulation
  • VOUT Set with Two External Resistors
  • INTVCC Pin for Control of Gate Driver Voltage
  • Programmable Soft Start
  • Programmable Undervoltage Lockout
  • Available in MSOP Package
  • AEC-Q100 Qualified for Automotive Applications
LT3748
100V Isolated Flyback Controller
LT3748 Application Circuit LT3748 Pin Configuration LT3748 Performance Graph
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Documentation

Data Sheet 1

User Guide 3

Application Note 1

Technical Articles 3

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Software Resources

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Hardware Ecosystem

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Tools & Simulations

LTspice 4

Models for the following parts are available in LTspice:

  • LT3748
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
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DC1961A

LT8309ES5/LT3748EMS Isolated Demo Board | 36V ≤ VIN ≤ 72V; VOUT = 12V @ 5A

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Product Details

Demonstration circuit 1961A features the LT8309, a secondary synchronous driver in an isolated, no optocoupler, flyback converter. It regulates a 12V, 5A output from a 36V to 72V input source. Output regulation is handled on the primary side by the LT3748, a boundary conduction mode flyback controller which senses output voltage directly from the primary, resulting in a simple flyback schematic with no opto-coupler.


 


eval board
schematic 7
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schematic 12
DC1961A

LT8309ES5/LT3748EMS Isolated Demo Board | 36V ≤ VIN ≤ 72V; VOUT = 12V @ 5A

Buy Now View Details

Product Details

Demonstration circuit 1961A features the LT8309, a secondary synchronous driver in an isolated, no optocoupler, flyback converter. It regulates a 12V, 5A output from a 36V to 72V input source. Output regulation is handled on the primary side by the LT3748, a boundary conduction mode flyback controller which senses output voltage directly from the primary, resulting in a simple flyback schematic with no opto-coupler.


 


eval board
schematic 13
DC1557A

LT3748EMS Isolated Demo Board | 30V VIN  75V; VOUT = 12V @ 1A

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Product Details

Demonstration circuit 1557A is an Non-Opto Isolated Flyback Converter featuring LT3748EMS. It is designed for 12V output from a 30V to 75V DC input. The output current is up to 1A. The part senses the isolated output voltage directly from the primary side flyback waveform during the off time of the power switch. No third winding, opto-coupler or signal transformer is required for regulation. A minimum load of approximately 2% of maximum load is required on the output.


The LT3748EMS is a high input voltage isolated flyback controller operating with input supply voltages from 5V to 100V. The LT3748EMS utilizes boundary mode operation to provide a high efficiency, small size solution with improved load regulation of ±5% over the full line, load and temperature ranges.

eval board
schematic 14
DC1557A

LT3748EMS Isolated Demo Board | 30V VIN  75V; VOUT = 12V @ 1A

Buy Now View Details

Product Details

Demonstration circuit 1557A is an Non-Opto Isolated Flyback Converter featuring LT3748EMS. It is designed for 12V output from a 30V to 75V DC input. The output current is up to 1A. The part senses the isolated output voltage directly from the primary side flyback waveform during the off time of the power switch. No third winding, opto-coupler or signal transformer is required for regulation. A minimum load of approximately 2% of maximum load is required on the output.


The LT3748EMS is a high input voltage isolated flyback controller operating with input supply voltages from 5V to 100V. The LT3748EMS utilizes boundary mode operation to provide a high efficiency, small size solution with improved load regulation of ±5% over the full line, load and temperature ranges.

eval board
schematic 15
schematic 16
schematic 17
schematic 18
DC1694B

LT3748EMS Isolated Demo Board | No-Opto Flyback, 22V ≤ VIN ≤ 75V; VOUT = 12V @ 2.5A

Buy Now View Details

Product Details

Demonstration circuit 1694B is an isolated flyback converter featuring the LT3748. The demo circuit is designed for a 12V output from a 22V to 75V DC input. The output current is up to 2.5A. The part senses the isolated output voltage directly from the primary side flyback waveform during the off time of the power switch. No third winding, opto-coupler, or signal transformer is required for regulation. A minimum load of approximately 2% of maximum load is required on the output to maintain regulation.

eval board
schematic 19
schematic 20
schematic 21
schematic 22
DC1694B

LT3748EMS Isolated Demo Board | No-Opto Flyback, 22V ≤ VIN ≤ 75V; VOUT = 12V @ 2.5A

Buy Now View Details

Product Details

Demonstration circuit 1694B is an isolated flyback converter featuring the LT3748. The demo circuit is designed for a 12V output from a 22V to 75V DC input. The output current is up to 2.5A. The part senses the isolated output voltage directly from the primary side flyback waveform during the off time of the power switch. No third winding, opto-coupler, or signal transformer is required for regulation. A minimum load of approximately 2% of maximum load is required on the output to maintain regulation.

eval board
schematic 23
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schematic 25
schematic 26
schematic 27
DC1860B

LT3748EMS Isolated Demo Board | 10V ≤ VIN ≤ 15V; VOUT = 52.5V @ 0.7A

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Product Details

Demonstration circuit 1860B is an isolated flyback converter featuring the LT3748. This demo circuit is designed for Power Sourcing Equipment (PSE) applications with a 52.5V output from a 10V to 15V DC input, with nominal input voltage of 12V. The output current is from 0mA to 700mA, and is capable of a maximum short period overload current of 900mA.


The LT3748 is a high input voltage isolated flyback controller operating with input supply voltages from 5V to 100V, and 1.9A average gate drive source and sink current.



eval board
schematic 28
schematic 29
schematic 30
schematic 31
schematic 32
DC1860B

LT3748EMS Isolated Demo Board | 10V ≤ VIN ≤ 15V; VOUT = 52.5V @ 0.7A

Buy Now View Details

Product Details

Demonstration circuit 1860B is an isolated flyback converter featuring the LT3748. This demo circuit is designed for Power Sourcing Equipment (PSE) applications with a 52.5V output from a 10V to 15V DC input, with nominal input voltage of 12V. The output current is from 0mA to 700mA, and is capable of a maximum short period overload current of 900mA.


The LT3748 is a high input voltage isolated flyback controller operating with input supply voltages from 5V to 100V, and 1.9A average gate drive source and sink current.
DC1961A
LT8309ES5/LT3748EMS Isolated Demo Board | 36V ≤ VIN ≤ 72V; VOUT = 12V @ 5A
DC1961A Demo Board DC1961A Demo Board DC1961A Demo Board DC1961A Demo Board DC1961A Demo Board DC1961A - Schematic
DC1961A
LT8309ES5/LT3748EMS Isolated Demo Board | 36V ≤ VIN ≤ 72V; VOUT = 12V @ 5A
DC1961A Demo Board DC1961A Demo Board DC1961A Demo Board DC1961A Demo Board DC1961A Demo Board DC1961A - Schematic
DC1557A
LT3748EMS Isolated Demo Board | 30V VIN  75V; VOUT = 12V @ 1A
DC1557A - Schematic
DC1557A
LT3748EMS Isolated Demo Board | 30V VIN  75V; VOUT = 12V @ 1A
DC1557A - Schematic
DC1694B
LT3748EMS Isolated Demo Board | No-Opto Flyback, 22V ≤ VIN ≤ 75V; VOUT = 12V @ 2.5A
DC1694B Demo Board DC1694B Demo Board DC1694B Demo Board DC1694B - Schematic
DC1694B
LT3748EMS Isolated Demo Board | No-Opto Flyback, 22V ≤ VIN ≤ 75V; VOUT = 12V @ 2.5A
DC1694B Demo Board DC1694B Demo Board DC1694B Demo Board DC1694B - Schematic
DC1860B
LT3748EMS Isolated Demo Board | 10V ≤ VIN ≤ 15V; VOUT = 52.5V @ 0.7A
DC1860B Demo Board DC1860B Demo Board DC1860B Demo Board DC1860B Demo Board DC1860B - Schematic
DC1860B
LT3748EMS Isolated Demo Board | 10V ≤ VIN ≤ 15V; VOUT = 52.5V @ 0.7A
DC1860B Demo Board DC1860B Demo Board DC1860B Demo Board DC1860B Demo Board DC1860B - Schematic

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