LT1737
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LT1737

High Power Isolated Flyback Controller

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Part Details
Part Models 8
1ku List Price Starting From $3.64
Features
  • Drives External Power MOSFET
  • Supply Voltage Range: 4.5V to 20V
  • Flyback Voltage Limited Only by External Components
  • Senses Output Voltage Directly from Primary Side Winding—No Optoisolator Required
  • Moderate Accuracy Regulation Without User Trims
  • Regulation Maintained Well into Discontinuous Mode
  • Switching Frequency from 50kHz to 250kHz with External Capacitor
  • Available in 16-Pin GN and SO Packages
  • Optional Load Compensation
  • Optional Undervoltage Lockout
  • External ISENSE Resistor
  • Shutdown Feature Reduces IQ to 50µA Typ
Additional Details
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The LT1737 is a monolithic switching regulator controller specifically designed for the isolated flyback topology. It drives the gate of an external MOSFET and is generally powered from a DC supply voltage. Output voltage feedback information may be supplied by a variety of methods including a third transformer winding, the primary winding or even direct DC feedback (see Applications Information). Its gate drive capability, coupled with a suitable external MOSFET and other power path components, can deliver load power up to tens of Watts.

The LT1737 has a number of features not found on other isolated flyback controller ICs presently available. By utilizing current mode switching techniques, it provides excellent AC and DC line regulation. Its unique control circuitry can maintain regulation well into discontinuous mode in most applications. Optional load compensation circuitry allows for improved load regulation. An optional undervoltage lockout pin halts operation when the application input voltage is too low. An optional external capacitor implements a soft-start function.

Applications

  • Isolated Flyback Switching Regulators
  • Medical Instruments
  • Instrumentation Power Supplies
Part Models 8
1ku List Price Starting From $3.64

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Oct 11, 2022

- 22_0235

Epoxy Change from Henkel 8290 to 8290A for GN Package

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PRODUCTION

LT1737CGN#TRPBF

PRODUCTION

LT1737IGN#PBF

PRODUCTION

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PRODUCTION

Apr 6, 2022

- 22_0066

Laser Top Mark for 16QSOP Assembled in ADPG [PNG]

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PRODUCTION

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PRODUCTION

LT1737IGN#PBF

PRODUCTION

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PRODUCTION

Oct 12, 2022

- 22_0252

Epoxy Change from Henkel 8290 to 8290A for 16-Lead SOIC Package

LT1737CS#PBF

PRODUCTION

LT1737CS#TRPBF

PRODUCTION

LT1737IS#PBF

PRODUCTION

LT1737IS#TRPBF

PRODUCTION

Aug 6, 2022

- 22_0173

Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]

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PRODUCTION

LT1737CS#TRPBF

PRODUCTION

LT1737IS#PBF

PRODUCTION

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Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0235

arrow down

Epoxy Change from Henkel 8290 to 8290A for GN Package

LT1737CGN#PBF

PRODUCTION

LT1737CGN#TRPBF

PRODUCTION

LT1737IGN#PBF

PRODUCTION

LT1737IGN#TRPBF

PRODUCTION

Apr 6, 2022

- 22_0066

arrow down

Laser Top Mark for 16QSOP Assembled in ADPG [PNG]

LT1737CGN#PBF

PRODUCTION

LT1737CGN#TRPBF

PRODUCTION

LT1737IGN#PBF

PRODUCTION

LT1737IGN#TRPBF

PRODUCTION

Oct 12, 2022

- 22_0252

arrow down

Epoxy Change from Henkel 8290 to 8290A for 16-Lead SOIC Package

LT1737CS#PBF

PRODUCTION

LT1737CS#TRPBF

PRODUCTION

LT1737IS#PBF

PRODUCTION

LT1737IS#TRPBF

PRODUCTION

Aug 6, 2022

- 22_0173

arrow down

Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]

LT1737CS#PBF

PRODUCTION

LT1737CS#TRPBF

PRODUCTION

LT1737IS#PBF

PRODUCTION

LT1737IS#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC418A

LT1737CS | Isolated, Triple Output Power Supply, VIN=8V to 36V, VOUT=+15V @ 100mA, -15V @ 100mA, +5V @ 200mA

Tools & Simulations

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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