LT1243
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LT1243

High Speed Current Mode Pulse Width Modulators

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LTspice LT1243 - Power Control Download 6.07 KB LTspice LT1243 Demo Circuit - 300kHz Off-Line Power Supply (90-240VAC to 20V @ 1.5A) Download 6.00KB
Part Models 6
1ku List Price Starting From $2.61
Features
  • Low Start-Up Current: <250µA
  • 50ns Current Sense Delay
  • Current Mode Operation: To 500kHz
  • Pin Compatible with UC1842 Series
  • Undervoltage Lockout with Hysteresis
  • No Cross-Conduction Current
  • Trimmed Bandgap Reference
  • 1A Totem Pole Output
  • Trimmed Oscillator Frequency and Sink Current
  • Active Pull-Down on Reference and Output During Undervoltage Lockout
  • High Level Output Clamp: 18V
  • Current Sense Leading Edge Blanking
Additional Details
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The LT1241 series devices are 8-pin, fixed frequency, current mode, pulse width modulators. They are improved plug compatible versions of the industry standard UC1842 series. These devices have both improved speed and lower quiescent current. The LT1241 series is optimized for off-line and DC/DC converter applications. They contain a temperature-compensated reference, high gain error amplifier, current sensing comparator and a high current totem pole output stage ideally suited to driving power MOSFETs. Start-up current has been reduced to less than 250µA. Cross-conduction current spikes in the output stage have been eliminated, making 500kHz operation practical. Several new features have been incorporated. Leading edge blanking has been added to the current sense comparator. Trims have been added to the oscillator circuit for both frequency and sink current, and both of these parameters are tightly specified. The output stage is clamped to a maximum VOUT of 18V in the on state. The output and the reference output are actively pulled low during undervoltage lockout.

Applications

  • Off-Line Converters
  • DC/DC Converters
Show More Arrow image
file View Data Sheet (Rev.B)
Documentation View All Documentation
LTspice LT1243 - Power Control Download 6.07 KB LTspice LT1243 Demo Circuit - 300kHz Off-Line Power Supply (90-240VAC to 20V @ 1.5A) Download 6.00KB
Part Models 6
1ku List Price Starting From $2.61
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LT1243

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Data Sheet

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UPDATED 08/22/2007
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LT1241 Series: High Speed Current Mode Pulse Width Modulators Data Sheet (Rev.B)

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UPDATED 03/22/2018
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Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT1243CN8#PBF 8-Lead PDIP (Narrow 0.3 Inch) external-link
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  • Material Declaration external-link
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LT1243CS8#PBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1243CS8#TRPBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1243IN8#PBF 8-Lead PDIP (Narrow 0.3 Inch) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1243IS8#PBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LT1243IS8#TRPBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link

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Product Lifecycle

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Oct 8, 2024

- 24_0234

Migrating Bottom Trace Code Marking to Top Side Laser Marking for PDIP Package

LT1243CN8#PBF

PRODUCTION

LT1243IN8#PBF

PRODUCTION

pdf

PCN24_0234_Form

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Material_Report

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pdf

Marking Comparison

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Oct 11, 2022

- 22_0241

Epoxy Change from Henkel 8290 to 8290A for PDIP Package

LT1243CN8#PBF

PRODUCTION

LT1243IN8#PBF

PRODUCTION

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PCN22_0241_Form

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Material_Report

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Qualification Results Summary

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Aug 6, 2022

- 22_0172

Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]

LT1243CN8#PBF

PRODUCTION

LT1243IN8#PBF

PRODUCTION

pdf

PCN22_0172_Form

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xls

Material_Report

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xlsm

Delta Qualification Matrix

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Dec 14, 2023

- 22_0255

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

LT1243CS8#PBF

PRODUCTION

LT1243CS8#TRPBF

PRODUCTION

LT1243IS8#PBF

PRODUCTION

LT1243IS8#TRPBF

PRODUCTION

pdf

PCN22_0255_Form

external-icon

xls

Material_Report

Download

pdf

Qualification Results Summary

external-icon

xlsm

Delta Qualification Matrix

Download

Jun 11, 2021

- 21_0060

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LT1243CS8#PBF

PRODUCTION

LT1243CS8#TRPBF

PRODUCTION

LT1243IS8#PBF

PRODUCTION

LT1243IS8#TRPBF

PRODUCTION

pdf

PCN21_0060_Form

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xls

Material_Report

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xlsm

Delta Qualification Matrix

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Filter by Model

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Part Models

Product Lifecycle

PCN

Oct 8, 2024

- 24_0234

arrow down

Migrating Bottom Trace Code Marking to Top Side Laser Marking for PDIP Package

LT1243CN8#PBF

PRODUCTION

LT1243IN8#PBF

PRODUCTION

pdf

PCN24_0234_Form

external-icon

xls

Material_Report

Download

pdf

Marking Comparison

external-icon
Oct 11, 2022

- 22_0241

arrow down

Epoxy Change from Henkel 8290 to 8290A for PDIP Package

LT1243CN8#PBF

PRODUCTION

LT1243IN8#PBF

PRODUCTION

pdf

PCN22_0241_Form

external-icon

xls

Material_Report

Download

pdf

Qualification Results Summary

external-icon
Aug 6, 2022

- 22_0172

arrow down

Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]

LT1243CN8#PBF

PRODUCTION

LT1243IN8#PBF

PRODUCTION

pdf

PCN22_0172_Form

external-icon

xls

Material_Report

Download

xlsm

Delta Qualification Matrix

Download
Dec 14, 2023

- 22_0255

arrow down

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

LT1243CS8#PBF

PRODUCTION

LT1243CS8#TRPBF

PRODUCTION

LT1243IS8#PBF

PRODUCTION

LT1243IS8#TRPBF

PRODUCTION

pdf

PCN22_0255_Form

external-icon

xls

Material_Report

Download

pdf

Qualification Results Summary

external-icon

xlsm

Delta Qualification Matrix

Download
Jun 11, 2021

- 21_0060

arrow down

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LT1243CS8#PBF

PRODUCTION

LT1243CS8#TRPBF

PRODUCTION

LT1243IS8#PBF

PRODUCTION

LT1243IS8#TRPBF

PRODUCTION

pdf

PCN21_0060_Form

external-icon

xls

Material_Report

Download

xlsm

Delta Qualification Matrix

Download

Software & Part Ecosystem

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

spice tool Lt Spice

LT1243 - Power Control Download

6.07 K

spice tool Lt Spice

LT1243 Demo Circuit - 300kHz Off-Line Power Supply (90-240VAC to 20V @ 1.5A) Download

6.00K

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