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reference designLT3512

Analog Devices LT3512

Monolithic High Voltage Isolated Flyback Converter

Overview

TopologyFlyback Converter
Input voltage36-72 V
Switching frequency40-650 kHz
Output 13.3 V / 0.7 A
Output 224 V / 0.11 A
Output 3-15 V / 0.1 A
Output 412 V / 0.2 A
Output 515 V / 0.2 A
Output 615 V / 0.1 A
Output 75 V / 0.5 A
IC revisionB

Description

The LT3512 is a high voltage monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or opto-isolator is required for regulation as the part senses output voltage directly from the primary-side flyback waveform. The device integrates a 420mA, 150V power switch, high voltage circuitry, and control into a high voltage 16-lead MSOP package with four leads removed.

The LT3512 operates from an input voltage range of 4.5V to 100V and delivers up to 4.5W of isolated output power. Two external resistors and the transformer turns ratio easily set the output voltage. Off-the-shelf transformers are available for several applications. The high level of integration and the use of boundary mode operation results in a simple, clean, tightly regulated application solution to the traditionally tough problem of isolated power delivery.

Features

  • 4.5V to 100V Input Voltage Range
  • Internal 420mA, 150V Power Switch
  • Boundary Mode Operation
  • No Transformer Third Winding or
  • Opto-Isolator Required for Regulation
  • Improved Primary-Side Winding Feedback Load Regulation
  • VOUT Set with Two External Resistors
  • BIAS Pin for Internal Bias Supply and Power Switch Driver
  • No External Start-Up Resistor
  • 16-Lead MSOP Package

Remarks:

  • Refer page num 10 for more transformers.

Typical applications

  • Automotive Power Supplies
  • Isolated Telecom Power Supplies
  • Isolated Auxiliary/Housekeeping Power Supplies
  • Isolated Industrial Power Supplies
  • Medical Power Supplies

More information

Products

Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
VIN(V)
VOut1(V)
IOut1(mA)
Vaux(V)
L(µH)
n
ISAT(A)
LS(µH)
VT(V (AC))
Size
IC Reference
Samples
750311559
WE-FLYLT Flyback Transformers for Linear Technology, 35 - 75 V (DC), 5 V
Simu­lation
Downloads9 files

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ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-FLYLT Flyback Transformers for Linear Technology
Input Voltage 35 - 75 V (DC)
Output Voltage 15 V
Output Current 1400 mA
Auxiliary Voltage5 V
Inductance175 µH
Turns Ratio4:1:1 
Saturation Current0.8 A
Leakage Inductance3 µH
Insulation Test Voltage1500 V (AC)
SizeEP7 
IC ReferenceLT8300 
750311573
Flyback Transformer WE-FB, 35 - 75, 5 V
Simu­lation
Downloads3 files

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ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product series Flyback Transformer WE-FB
Input Voltage 35 - 75
Output Voltage 15 V
Output Current 1500 mA
Auxiliary Voltage6.6 V
Inductance200 µH
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Saturation Current0.8 A
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Insulation Test Voltage1500 V (AC)
SizeEP7 
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750311662
Flyback Transformer WE-FB, 36 - 72 V (DC), 48 V
Simu­lation
Downloads3 files

CAD files ZIP

Others ZIP

Download all 3 files as zip archive
ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product series Flyback Transformer WE-FB
Input Voltage 36 - 72 V (DC)
Output Voltage 148 V
Output Current 1130 mA
Auxiliary Voltage5 V
Inductance0.33 µH
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Saturation Current0.8 A
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Insulation Test Voltage1500 V (AC)
SizeEP7 
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750311839
Flyback Transformer WE-FB, –, –
Simu­lation–
Downloads–
Status Activei| Production is active. Expected lifetime: >10 years.
Product series Flyback Transformer WE-FB
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