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Overview
| Topology | Flyback Converter |
| Input voltage | 10-38 V |
| Switching frequency | 0.5-150 kHz |
| Output 1 | 48 V |
| Output 2 | 12 V |
| Output 3 | 24 V |
| 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 | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-OLLT Offline Flyback Transformers, 85 - 141 V (AC), 11 V | 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 | ||||
 | WE-OLLT Offline Flyback Transformers, 85 - 265 V (AC), 28 V | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 85 - 265 V (AC) | Output Voltage 128 V | Output Current 1500 mA | Auxiliary Voltage20 V | DC Resistance 12.4 Ω | DC Resistance 20.241 Ω | DC Resistance 31.55 Ω | Switching Frequency 100 | Inductance0.6 mH | Turns Ratio4:1:0.71 | Saturation Current1750 mA | Insulation Test Voltage4500 V (AC) | Length18.5 mm | Width16.5 mm | Height18.8 mm | MountTHT | SizeEE16/7/5 | ||||
 | WE-OLLT Offline Flyback Transformers, 85 - 265 V (AC), 18 V | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 85 - 265 V (AC) | Output Voltage 118 V | Output Current 15000 mA | Auxiliary Voltage18 V | DC Resistance 10.15 Ω | DC Resistance 20.008 Ω | DC Resistance 30.042 Ω | Switching Frequency 200 | Inductance0.3 mH | Turns Ratio6:1:1 | Saturation Current4000 mA | Insulation Test Voltage4500 V (AC) | Length39.6 mm | Width43.18 mm | Height30.48 mm | MountTHT | SizeETD34 |