LT3799-1

PRODUCTION

Offline Isolated Flyback LED Controller with Active PFC

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

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Overview

Isolated PFC LED Driver with Minimum Number of External Components
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 LT3799-1 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 V_IN LED 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-1#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3799EMSE-1#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3799IMSE-1#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3799IMSE-1#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

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-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
		PCN20_0132_Form Material_Report
LT3799EMSE-1#PBF	PRODUCTION
LT3799EMSE-1#TRPBF	PRODUCTION
LT3799IMSE-1#PBF	PRODUCTION
LT3799IMSE-1#TRPBF	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Analog to Digital Converters (ADCs) 1
LTC2991	RECOMMENDED FOR NEW DESIGNS	Octal I²C Voltage, Current, and Temperature Monitor
LED Drivers 1
LT3746	PRODUCTION	32-Channel 20mA LED Driver with Buck Controller
Protection Switches & Controllers 1
LTC4366	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper

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

Tools & Simulations

LTspice 1

LT3799-1 Demo Circuit - Offline Isolated Flyback LED Controller with Active PFC (277VAC to 3A/36V)

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.

Evaluation Kits

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

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Product Details

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.