LT3837

PRODUCTION

Isolated No-Opto Synchronous Flyback Controller

Data Sheet Product Selection Table
Part Models
4
1ku List Price
Starting From $3.72
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Part Details

  • Senses Output Voltage Directly from Primary Side Winding—No Optoisolator Required
  • Synchronous Driver for High Efficiency
  • Supply Voltage Range 4.5V to 20V
  • Accurate Regulation Without User Trims
  • Programmable Switching Frequency from 50kHz to 250kHz
  • Synchronizable
  • Load Compensation
  • Undervoltage Lockout
  • Available in a Thermally Enhanced 16-Lead TSSOP Package
LT3837
Isolated No-Opto Synchronous Flyback Controller
9V –18V to 3.3V at 10A Isolated Converter Efficiency vs Load Current Product Package 1 Regulation vs Load Current
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 4

Design Note 2

Data Sheet

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

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Isolated µModule Converters 2
LTM8047
RECOMMENDED FOR NEW DESIGNS 3.1VIN to 32VIN Isolated μModule (Power Module) DC/DC Converter
LTM8048
RECOMMENDED FOR NEW DESIGNS 3.1VIN to 32VIN Isolated μModule (Power Module) DC/DC Converter with LDO Post Regulator
PowerPath, Ideal Diodes, and Load Switches 1
LTC4359
RECOMMENDED FOR NEW DESIGNS Ideal Diode Controller with Reverse Input Protection
Silicon Oscillators 2
LTC6908
Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
LTC6909
PRODUCTION 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3837
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
DC950A-B

LT3837EFE Demo Board | 9V ≤ VIN ≤ 36V, VOUT: 5V/2A, 3.3V/3A, 2.5V/3A

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Product Details

Demonstration circuit 950A-B is an isolated, 30W multi-output, synchronous flyback converter in 1/8 brick format featuring the LT3837. Output voltage sensing is implemented without the use of opto-coupler, by sensing the voltage across a primary side auxiliary winding. A load compensation circuit is used to compensate for voltage drops caused by load currents. DC950A-B has input voltage range 9V-36V. Demonstration circuit 950A uses a transformer design with tapped secondary winding, to achieve higher efficiency and better cross regulation than is possible with a transformer that uses a separate winding for each output.



eval board
schematic 2
DC1038A-B

LT3837EFE | 9V to 36V input to 5V at 7A Synchronous Flyback Converter

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Product Details

Demonstration circuit 1038A-B is a 35W isolated flyback converter with synchronous rectification and primary-side regulation featuring the LT3837. This circuit was designed to demonstrate the high levels of performance, efficiency, and small solution size attainable using the part in a flyback power supply. It operates at 200kHz and produces a regulated 5V, 7A output from an input voltage range of 9V to 36V. Isolation voltage is 1500VDC.

eval board
schematic 3
DC1038A-C

LT3837EFE | 9V to 36V input to 12V at 3A Synchronous Flyback Converter

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Product Details

Demonstration circuit 1038A-C is a 36W isolated flyback converter with synchronous rectification and primary-side regulation featuring the LT3837. This circuit was designed to demonstrate the high levels of performance, efficiency, and small solution size attainable using the part in a flyback power supply. It operates at 200kHz and produces a regulated 12V, 3A output from an input voltage range of 9V to 36V. Isolation voltage is 1500VDC.

eval board
schematic 4
DC1038A-A

LT3837EFE | 9V to 36V input to 3.3V at 10A Synchronous Flyback Converter

Buy Now View Details

Product Details

Demonstration circuit 1038A-A is a 33W isolated flyback converter with synchronous rectification and primary-side regulation featuring the LT3837. This circuit was designed to demonstrate the high levels of performance, efficiency, and small solution size attainable using the part in a flyback power supply. It operates at 200kHz and produces a regulated 3.3V, 10A output from an input voltage range of 9V to 36V. Isolation voltage is 1500VDC.
DC950A-B
LT3837EFE Demo Board | 9V ≤ VIN ≤ 36V, VOUT: 5V/2A, 3.3V/3A, 2.5V/3A
DC950A-A - Schematic
DC1038A-B
LT3837EFE | 9V to 36V input to 5V at 7A Synchronous Flyback Converter
DC1038A-B - Schematic
DC1038A-C
LT3837EFE | 9V to 36V input to 12V at 3A Synchronous Flyback Converter
DC1038A-C - Schematic
DC1038A-A
LT3837EFE | 9V to 36V input to 3.3V at 10A Synchronous Flyback Converter
DC1038A-A - Schematic

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