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Overview
| Topology | Flyback Converter |
| Input voltage | 10-38 V |
| Switching frequency | 0.5-150 kHz |
| Output 1 | 3.8 V / 1.1 A |
| Output 2 | 10 V / 0.4 A |
| IC revision | A |
Description
The LT®3798 is a constant-voltage/constant-current isolated flyback controller that combines active power factor correction (PFC) with no opto-coupler required for output voltage feedback into a single-stage converter. A LT3798 based design can achieve a power factor of greater than 0.97 by actively modulating the input current, allowing compliance with most Harmonic Current Emission requirements.
The LT3798 is well suited for a wide variety of off-line applications. The input range can be scaled up or down, depending mainly on the choice of external components. Efficiencies higher than 86% can be achieved with output power levels up to 100W. In addition, the LT3798 can easily be designed into high DC input applications.
Features
- Isolated PFC Flyback with Minimum Number of External Components
- VIN and VOUT Limited Only by External Components
- Active Power Factor Correction
- Low Harmonic Distortion
- No Opto-Coupler Required
- Constant-Current and Constant-Voltage Regulation
- Accurate Regulated Voltage and Current (±5% Typical)
- Energy Star Compliant (<0.5W No Load Operation)
- Thermally Enhanced 16-lead MSOP Package
Remarks:-Refer page 14Table 1. Predesigned Transformers-Typical Specification,Unless Otherwise Noted
Typical applications
- High DC VIN Isolated Applications
- Offline Bus Converter (12V, 24V or 48V Outputs)
- Offline 5W to 100W+ Applications
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | VIN | VOut1(V) | IOut1(mA) | Vaux(V) | RDC 1(Ω) | RDC 2(Ω) | RDC 3(Ω) | fswitch(kHz) | L(mH) | NPRI : NSEC : NAUX | ISAT(mA) | VT(V (AC)) | L(mm) | W(mm) | H(mm) | Mount | Size | SamplesAvailability & Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SPECWE-OLLT Offline Flyback Transformers, 85 - 141 V (AC), 11 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 85 - 141 V (AC) | Output Voltage 111 V | Output Current 1350 mA | Auxiliary Voltage15 V | DC Resistance 15.1 Ω | DC Resistance 20.092 Ω | DC Resistance 31.35 Ω | Switching Frequency 100 | Inductance2 mH | Turns Ratio6.67:1:1.67 | Saturation Current270 mA | Insulation Test Voltage4500 V (AC) | Length15 mm | Width15.75 mm | Height18.5 mm | MountTHT | SizeEE13/6/6 | –Check availability | |||
| SPECWE-OLLT Offline Flyback Transformers, 90 - 265 V (AC), 3.4 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 90 - 265 V (AC) | Output Voltage 13.4 V | Output Current 11000 mA | Auxiliary Voltage17 V | DC Resistance 16.25 Ω | DC Resistance 20.016 Ω | DC Resistance 31.7 Ω | Switching Frequency 100 | Inductance2 mH | Turns Ratio20:1:5 | Saturation Current350 mA | Insulation Test Voltage4500 V (AC) | Length15 mm | Width15.75 mm | Height18.5 mm | MountTHT | SizeEE13/6/6 | –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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