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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) | L(µH) | L(mm) | W(mm) | H(mm) | SamplesAvailability & Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SPECWE-OLLT Offline Flyback Transformers, 85 - 304 V (AC), 33 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 85 - 304 V (AC) | Output Voltage 133 V | Output Current 12.5 A | Auxiliary Voltage22 V | DC Resistance 10.11 Ω | DC Resistance 20.01 Ω | DC Resistance 30.133 Ω | Switching Frequency 70 | Turns Ratio3.3:1:5:1 | Saturation Current6 A | Insulation Test Voltage1500 V (AC) | MountTHT | SizeER28/14 | – | – | – | – | – | – | – | Inductance200 µH | Length31 mm | Width31 mm | Height25 mm | –Check availability | |||
 | SPECWE-CBF SMT EMI Suppression Ferrite Bead, –, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | – | – | – | – | – | – | – | – | MountSMT | Size1806 | Impedance @ 100 MHz110 Ω | Maximum Impedance170 Ω | Maximum Impedance600 MHz | Rated Current 24000 mA | DC Resistance0.035 Ω | TypeHigh Current | Rated Current2000 mA | – | Length4.5 mm | Width1.6 mm | Height1.6 mm | –Check availability | |||
 | SPECWE-WAFB Sleeve Choke, –, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-WAFB Sleeve Choke | – | – | – | – | – | – | – | – | – | – | – | MountTHT | – | Impedance @ 100 MHz89 Ω | Maximum Impedance960 Ω | Maximum Impedance1350 MHz | – | DC Resistance0.005 Ω | – | Rated Current3000 mA | Inductance0.55 µH | Length63 mm | Width3.5 mm | Height6 mm | –Check availability | |||
| SPECWE-WAFB Sleeve Choke, –, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-WAFB Sleeve Choke | – | – | – | – | – | – | – | – | – | – | – | MountTHT | – | Impedance @ 100 MHz100 Ω | Maximum Impedance715 Ω | Maximum Impedance1400 MHz | – | DC Resistance0.005 Ω | – | Rated Current3000 mA | Inductance0.633 µH | Length63 mm | Width3.5 mm | Height7.5 mm | –Check availability |
Availability Forecast
WE item number Packaging unitsLead time
––– weeks
| Expected Availability | Opening inventory | Quantity |
|---|---|---|
| Current Availability | – | – |
There is no forecast for this quantity request.
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