LT3799-1
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LT3799-1

Offline Isolated Flyback LED Controller with Active PFC

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Info: : PRODUCTION tooltip
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Part Details
Part Models 4
1ku List Price Starting From $2.72
Features
  • Isolated PFC LED Driver with Minimum Number of External Components
  • VIN and VOUT Limited Only by External Components
  • Active Power Factor Correction (Typical PFC > 0.97)
  • Low Harmonic Content
  • No Opto-Coupler Required
  • Accurate Regulated LED Current (±5% Typical)
  • Open LED and Shorted LED Protection
  • Thermally Enhanced 16-Lead MSOP Package
Additional Details
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The LT3799-1 is an isolated flyback controller with power factor correction specifically designed for driving LEDs. The controller operates using critical conduction mode allowing the use of a small transformer. Using a novel current sensing scheme, the controller is able to deliver a well regulated current to the secondary side without using an opto-coupler. A strong gate driver is included to drive an external high voltage MOSFET. Utilizing an onboard multiplier, the LT3799-1 typically achieves power factors of 0.97. The FAULT pin provides notification of open and short LED conditions. The LT3799-1 offers improved line regulation over the LT3799, but is not designed for use with a TRIAC dimmer.

The LT3799-1 uses a micropower hysteretic start-up to efficiently operate at offline input voltages, with a third winding to provide power to the part. An internal LDO provides a well regulated supply for the part’s internal circuitry and gate driver.

Triac Dimmable LED Current Regulator
LT3799 Yes ± 10%
LT3799-1 No ± 5%

Applications

  • Offline 4W to 100W+ LED Applications
  • High DC VIN LED Applications
Part Models 4
1ku List Price Starting From $2.72

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT3799EMSE-1#PBF
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LT3799EMSE-1#TRPBF
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LT3799IMSE-1#PBF
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LT3799IMSE-1#TRPBF
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Product Lifecycle

PCN

Jun 5, 2024

- 24_0003

Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)

LT3799EMSE-1#PBF

PRODUCTION

LT3799EMSE-1#TRPBF

PRODUCTION

LT3799IMSE-1#PBF

PRODUCTION

LT3799IMSE-1#TRPBF

PRODUCTION

Feb 4, 2020

- 20_0132

Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

LT3799EMSE-1#PBF

PRODUCTION

LT3799EMSE-1#TRPBF

PRODUCTION

LT3799IMSE-1#PBF

PRODUCTION

LT3799IMSE-1#TRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Jun 5, 2024

- 24_0003

arrow down

Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)

LT3799EMSE-1#PBF

PRODUCTION

LT3799EMSE-1#TRPBF

PRODUCTION

LT3799IMSE-1#PBF

PRODUCTION

LT3799IMSE-1#TRPBF

PRODUCTION

Feb 4, 2020

- 20_0132

arrow down

Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

LT3799EMSE-1#PBF

PRODUCTION

LT3799EMSE-1#TRPBF

PRODUCTION

LT3799IMSE-1#PBF

PRODUCTION

LT3799IMSE-1#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

reference details image

DC1816B

LT3799EMSE-1 Demo Board I Offline Isolated Flyback LED Driver with PFC, 90VAC ≤ VIN ≤ 305VAC, VOUT = 36V(nom) @ 3A

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DC1816B

LT3799EMSE-1 Demo Board I Offline Isolated Flyback LED Driver with PFC, 90VAC ≤ VIN ≤ 305VAC, VOUT = 36V(nom) @ 3A

LT3799EMSE-1 Demo Board I Offline Isolated Flyback LED Driver with PFC, 90VAC ≤ VIN ≤ 305VAC, VOUT = 36V(nom) @ 3A

Product Detail

Demonstration circuit 1816B is an off-line isolated flyback LED driver featuring LT3799-1. The demo board provides a single constant current output of 3A over an LED string voltage from 22V to 38V. It is optimized to operate over a wide AC input voltage range (90VAC to 305VAC, 47Hz to 63Hz). LED current typically stays within ±5% over the whole input voltage range. It provides a high power factor (>0.9) enabling a single design to be used worldwide. It is also designed to comply with the IEC 61000-3-2 Class C harmonics standard and the EN55015B conducted EMI standard.

reference details image

DC1947A

LT3799EMSE-1 Demo Board | Offline Isolated Flyback LED Driver with PFC

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.

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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