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IC manufacturers ADI Power by Linear

IC manufacturers (83)

ADI Power by Linear LT3748

100V Isolated Flyback Controller

Overview

TopologyFlyback Converter
Input voltage20-70 V
Output 124 V / 1.9 A
IC revisionB

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

Products

Order Code Data­sheet Simu­lation Downloads Product seriesVINVOut1
(V)
IOut1
(A)
Vaux
(V)
L
(µH)
nISAT
(A)
LS
(µH)
VT
(V (AC))
SizeIC Reference Samples
750311596SPEC
7 files WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 30 - 75 V (DC) 24 1.9 10 12 1.5:1:0.5 18 0.4 1500 EFD25 LT3748
Order Code Data­sheet Simu­lation
750311596SPEC
Samples
Order Code Data­sheet Simu­lation Downloads Product seriesVINVOut1
(V)
IOut1
(A)
Vaux
(V)
L
(µH)
nISAT
(A)
LS
(µH)
VT
(V (AC))
SizeIC Reference Samples