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Overview
| Topology | Flyback Converter |
| Switching frequency | 25-300 kHz |
Description
The LT®3799-1 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 novelcurrent 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. TheFAULT 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.
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.
Typical applications
- Offline 4W to 100W+ LED Applications
- High DC VIN LED Applications
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | VIN | VOut1 (V) | IOut1 (A) | Vaux (V) | RDC 1 (Ω) | RDC 2 (Ω) | RDC 3 (Ω) | fswitch (kHz) | NPRI : NSEC : NAUX | ISAT (A) | VT (V (AC)) | Mount | Size | Z @ 100 MHz (Ω) | Zmax (Ω) | Test Condition Zmax | IR 2 (mA) | RDC max. (Ω) | Type | IR (mA) | Z @ 10 MHz (Ω) | L (µH) | L (mm) | W (mm) | H (mm) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 750312646 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-OLLT Offline Flyback Transformers | 85 - 304 V (AC) | 33 | 2.5 | 22 | 0.11 | 0.01 | 0.133 | 70 | 3.3:1:5:1 | 6 | 1500 | THT | ER28/14 | – | – | – | – | – | – | – | – | 200 | 31 | 31 | 25 | ||
 | 74279245 | SPEC | 9 files | Active i| Production is active. Expected lifetime: >10 years. | WE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | – | – | – | – | – | – | – | – | SMT | 1806 | 110 | 170 | 600 MHz | 4000 | 0.035 | High Current | 2000 | – | – | 4.5 | 1.6 | 1.6 | ||
 | 74276041 | SPEC | 6 files | Active i| Production is active. Expected lifetime: >10 years. | WE-WAFB Sleeve Choke | – | – | – | – | – | – | – | – | – | – | – | THT | – | 89 | 960 | 1350 MHz | – | 0.005 | – | 3000 | 35 | 0.55 | 63 | 3.5 | 6 | ||
| 7427605 | SPEC | 6 files | Active i| Production is active. Expected lifetime: >10 years. | WE-WAFB Sleeve Choke | – | – | – | – | – | – | – | – | – | – | – | THT | – | 100 | 715 | 1400 MHz | – | 0.005 | – | 3000 | 50 | 0.633 | 63 | 3.5 | 7.5 |
| Samples |
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| Order Code | Datasheet | Simulation | Downloads | Status | Product series | VIN | VOut1 (V) | IOut1 (A) | Vaux (V) | RDC 1 (Ω) | RDC 2 (Ω) | RDC 3 (Ω) | fswitch (kHz) | NPRI : NSEC : NAUX | ISAT (A) | VT (V (AC)) | Mount | Size | Z @ 100 MHz (Ω) | Zmax (Ω) | Test Condition Zmax | IR 2 (mA) | RDC max. (Ω) | Type | IR (mA) | Z @ 10 MHz (Ω) | L (µH) | L (mm) | W (mm) | H (mm) | Samples |
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