LT3799-1: Offline Isolated Flyback LED Controller with Active PFC Data Sheet2/22/2016836K
Features and Benefits
- 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
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|
- Offline 4W to 100W+ LED Applications
- High DC VIN LED Applications
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
DC1947A: Demo Board for the LT3799-1 Offline Isolated Flyback LED Controller with Active PFC.
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.
Documentation & Resources
R530 Reliability Data3/26/201820 K
DC1816B - Demo Manual1/11/2014308K
DC1947A - Demo Manual1/29/2013249K
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|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LT3799EMSE-1#PBF||Material Declaration||Reliability Data||16-Lead MSOP w/ EP|
|LT3799EMSE-1#TRPBF||Material Declaration||Reliability Data||16-Lead MSOP w/ EP|
|LT3799IMSE-1#PBF||Material Declaration||Reliability Data||16-Lead MSOP w/ EP|
|LT3799IMSE-1#TRPBF||Material Declaration||Reliability Data||16-Lead MSOP w/ EP|
|Wafer Fabrication Data||R530 Reliability Data|
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