LT3799

PRODUCTION

Offline Isolated Flyback LED Controller with Active PFC

Part Models: 4
1ku List Price: Starting From $2.72

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Part Details

Isolated PFC LED Driver with Minimum Number of External Components
TRIAC Dimmable
V_IN and V_OUT 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

The LT3799 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 typically achieves power factors of 0.97. The FAULT pin provides notification of open and short LED conditions.

The LT3799 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 Regulation
LT3799	YES	±10%
LT3799-1	NO	±5%

Applications

Offline 4W to 100W+ LED Applications
High DC V_INLED Applications

Part Models: 4
1ku List Price: Starting From $2.72

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
LT3799EMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3799EMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3799IMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3799IMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LT3799EMSE#PBF	PRODUCTION
LT3799EMSE#TRPBF	PRODUCTION
LT3799IMSE#PBF	PRODUCTION
LT3799IMSE#TRPBF	PRODUCTION
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT3799EMSE#PBF	PRODUCTION
LT3799EMSE#TRPBF	PRODUCTION
LT3799IMSE#PBF	PRODUCTION
LT3799IMSE#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0132_Form Material_Report
LT3799EMSE#PBF	PRODUCTION
LT3799EMSE#TRPBF	PRODUCTION
LT3799IMSE#PBF	PRODUCTION
LT3799IMSE#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
Digital Temperature Sensors 1
LTC2991	RECOMMENDED FOR NEW DESIGNS	Octal I²C Voltage, Current, and Temperature Monitor
Step-Down (Buck) LED Drivers 1
LT3746	PRODUCTION	32-Channel 20mA LED Driver with Buck Controller
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LTC4366	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper

Parts	Product Life Cycle	Description
LT3799-1	PRODUCTION	Offline Isolated Flyback LED Controller with Active PFC

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LT3799
LT3799-1

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.