LT1509
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LT1509

Power Factor and PWM Controller

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Info: : PRODUCTION tooltip
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Part Models 6
1ku List Price Starting From $4.86
Features
  • PFC and PWM Single Chip Solution
  • Synchronized Operation up to 300kHz
  • 99% Power Factor over 20:1 Load Current Range
  • Current Mode PWM
  • Instantaneous Overvoltage Protection
  • Dedicated Overvoltage Protection (OVP Pin)
  • Minimal Line Current Dead Zone
  • Typical 250µA Start-Up Supply Current
  • Line Switching Noise Filter
  • Low Quiescent Current: 13mA
  • Fast 2A Peak Current Gate Drivers
  • Separate Soft Start Controls
Additional Details
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The LT1509 is a complete solution for universal off-line switching power supplies utilizing active power factor correction. The PFC section is identical to the LT1248 PFC controller except the EN/SYNC pin is removed because PFC and PWM are synchronized internally.

The current mode PWM section (the LT1508 is the volt-age-mode counterpart) contains all the primary side functions to convert the PFC preregulated high voltage output to an isolated low voltage output. The PWM duty cycle is internally limited to 47% (maximum 50%) to prevent transformer saturation. PWM soft start begins when PFC output reaches the preset voltage. In the event of brief line loss,the PWM will be shut off when the PFC output voltage drops below 73% of the preset value.

Applications

  • Universal Power Factor Corrected Power Supplies and Preregulators
Part Models 6
1ku List Price Starting From $4.86

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Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT1509CN#PBF
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LT1509CSW#PBF
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LT1509CSW#TRPBF
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LT1509IN#PBF
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LT1509ISW#PBF
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LT1509ISW#TRPBF
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Product Lifecycle

PCN

Mar 7, 2019

- 19_0046

Assembly Transfer of 18,20,24,28 Lead PDIP to Cirtek

Aug 10, 2022

- 22_0176

Laser Top Mark Conversion for SOIC_W Packages Assembled in ADPG [PNG] and UTL

LT1509CSW#PBF

PRODUCTION

LT1509CSW#TRPBF

PRODUCTION

LT1509ISW#PBF

PRODUCTION

LT1509ISW#TRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Mar 7, 2019

- 19_0046

arrow down

Assembly Transfer of 18,20,24,28 Lead PDIP to Cirtek

Aug 10, 2022

- 22_0176

arrow down

Laser Top Mark Conversion for SOIC_W Packages Assembled in ADPG [PNG] and UTL

LT1509CSW#PBF

PRODUCTION

LT1509CSW#TRPBF

PRODUCTION

LT1509ISW#PBF

PRODUCTION

LT1509ISW#TRPBF

PRODUCTION

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.

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