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reference designLT3748

Analog Devices LT3748

100V Isolated Flyback Controller

Overview

TopologyFlyback Converter
Input voltage20-75 V
Output 124 V / 1.3 A

Description

The LT3748 is a switching regulator controller specifically designed for the isolated flyback topology and capable of high power. It drives a low side external N-channel power MOSFET from an internally regulated 7V supply. No third winding or opto-isolator is required for regulation as the part senses the isolated output voltage directly from the primary-side flyback waveform.

The LT3748 utilizes boundary mode to provide a small magnetic solution without compromising load regulation. Operating frequency is set by load current and transformer magnetizing inductance. The gate drive of the LT3748 combined with a suitable external MOSFET allow it to deliver load power up to several tens of watts from input voltages as high as 100V.

The LT3748 is available in a high voltage 16-lead MSOP package with four leads removed.

Features

  • 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

Typical applications

  • Isolated Industrial Power Supplies, High Power Automotive Supplies
  • Military and High Temperature Applications, Isolated Telecom Converters

More information

Products

Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
VIN
VOut1(V)
IOut1(A)
Vaux(V)
L(µH)
n
ISAT(A)
LS(µH)
VT(V (AC))
Size
IC Reference
SamplesAvailability & Sample
750311608
SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 30 - 75 V (DC), 24 V
Simu­lation
Availability
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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748
Input Voltage 30 - 75 V (DC)
Output Voltage 124 V
Output Current 11.3 A
Auxiliary Voltage10 V
Inductance12 µH
Turns Ratio1.5:1:0.5 
Saturation Current9 A
Leakage Inductance1 µH
Insulation Test Voltage1500 V (AC)
SizeEFD20 
IC ReferenceLT3748 
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