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ADI Power by Linear LT3575

Isolated Flyback Converter without an Opto-Coupler

Overview

TopologyFlyback Converter
Input voltage3-40 V
Output 112 V / 0.8 A
Output 25 V / 1 A
Output 312 V / 0.3 A
Output 412 V / 0.5 A
Output 55 V / 2 A
Output 63.3 V / 1.5 A

Description

The LT3575 is a monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or optoisolator is required for regulation. The part senses the isolated output voltage directly from the primary side flyback waveform. A 2.5A, 60V NPN power switch is integrated along with all control logic into a 16-lead TSSOP package.

The LT3575 operates with input supply voltages from 3V to 40V, and can deliver output power up to 14W with no external power switch.The LT3575 utilizes boundary mode operation to provide a small magnetic solution with improved load regulation.

The output voltage is easily set with two external resistors and the transformer turns ratio. Off the shelf transformers are available for many applications.

Features

  • 3V to 40V Input Voltage Range
  • 2.5A, 60V Integrated NPN Power Switch
  • Boundary Mode Operation
  • No Transformer Third Winding orOptoisolator Required for Regulation
  • Improved Primary-Side Winding Feedback Load Regulation
  • VOUT Set with Two External Resistors
  • BIAS Pin for Internal Bias Supply and Power NPN Driver
  • Programmable Soft-Start
  • Programmable Power Switch Current Limit
  • Thermally Enhanced 16-Lead TSSOP

Remarks:

  • See page num 11 for more inductor values.

Typical applications

  • Medical Isolated Power Supplies
  • Automotive
  • Industrial

Products

Order Code Data­sheet Downloads Product seriesPinsApplicationPCB/Cable/PanelModularityTypeWire SectionIR
(A)
λDom typ.
(nm)
Emitting ColorλPeak typ.
(nm)
IV typ.
(mcd)
VF typ.
(V)
Chip Technology50% typ.
(°)
Interface TypeGenderMountWorking Voltage
(V (AC))
PackagingVinVOut1
(V)
IOut1
(A)
L1
(µH)
nIR
(A)
ISAT 1
(A)
LSmin.
(µH)
VT
(V (AC))
SizeIC Reference Samples
691102710002SPEC
6 files WR-TBL Series 102 - 5.00 mm Horiz. Entry Modular 2 Pressure Clamp PCB Yes Horizontal 22 to 14 (AWG) 0.326 to 2.08 (mm²) 17.5 250 Box
692622030100SPEC
6 files WR-COM Micro USB 3.0 Type B Horizontal SMT 10 Micro USB 3.0 Horizontal 1.8 Type B Receptacle SMT 30 Tape and Reel 1.8
750310562SPEC
8 files WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 18 - 30 V (DC) 12 0.8 25 2 : 1 2.8 0.5 1500 EP10 LT3573 & LT3575
750310563SPEC
8 files WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 18 - 30 V (DC) 12 0.8 25 1 : 1 2.8 0.5 1500 EP10 LT3573 & LT3575
750310471SPEC
8 files WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 9 - 30 V (DC) 5 2 25 3 : 1 2.6 0.43 1500 EP10 LT3573 & LT3575
750311675SPEC
8 files WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 9 - 30 V (DC) 5 2 25 3 : 1 2.5 0.13 1500 EP10 LT3573 & LT3575 & LT3748
150060BS75000SPEC
7 files WL-SMCW SMT Mono-color Chip LED Waterclear 470 Blue 465 145 3.2 InGaN 140 SMT Tape and Reel 0603
Samples
Order Code Data­sheet Downloads Product seriesPinsApplicationPCB/Cable/PanelModularityTypeWire SectionIR
(A)
λDom typ.
(nm)
Emitting ColorλPeak typ.
(nm)
IV typ.
(mcd)
VF typ.
(V)
Chip Technology50% typ.
(°)
Interface TypeGenderMountWorking Voltage
(V (AC))
PackagingVinVOut1
(V)
IOut1
(A)
L1
(µH)
nIR
(A)
ISAT 1
(A)
LSmin.
(µH)
VT
(V (AC))
SizeIC Reference Samples