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Analog Devices LT3748 | Demoboard DC1557A

100V Isolated Flyback Controller

Overview

TopologyFlyback Converter
Input voltage10-100 V
Switching frequency80-250 kHz
Output 15 V / 3 A
Output 25 V / 2.5 A
IC revisionLT3748EMS

Description

The LT®3748 is a switching regulator controller specificallydesigned for the isolated flyback topology and capable ofhigh power. It drives a low side external N-channel powerMOSFET from an internally regulated 7V supply. No thirdwinding or opto-isolator is required for regulation as thepart senses the isolated output voltage directly from theprimary-side flyback waveform.

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

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

More information

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
750311564SPEC
7 files WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 10 - 40 V (DC) 5 3 8 9.07 3:1:1.75 8 0.25 1500 EP13 LT3575 & LT3748
750311458SPEC
7 files WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 36 V (DC) 3.3 4 8 15 3:1:2.5 5 0.3 2500 EP13 LT3575 & LT3748
750311423SPEC
7 files WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 36 V (DC) 5 4 10 50 4:1:2 3.85 1.2 1500 EP13 LT3575 & LT3748
750311457SPEC
7 files WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 36 V (DC) 5 4 10 50 4:1:2 3.7 1.2 2500 EP13 LT3575 & LT3748
750311689SPEC
7 files WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 36 V (DC) 5 4 10 50 4:1:2 3.7 1.2 2500 EP13 LT3575 & LT3748
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