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Overview
| Topology | Flyback Converter |
| Input voltage | 90-265 V |
| Switching frequency | 0.5-150 kHz |
| Output 1 | 15 V / 5 A |
| Output 2 | -15 V / 0.3 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 | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | fres(MHz) | Mount | SamplesAvailability & Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SPECWE-LHMI SMT Power Inductor, 0.56 µH, 7.9 A | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | Inductance0.56 µH | Performance Rated Current7.9 A | Saturation Current @ 10%6.7 A | Saturation Current @ 30%13 A | DC Resistance16 mΩ | Self Resonant Frequency104 MHz | MountSMT | –Check availability | |||
| SPECWE-LHMI SMT Power Inductor, 1 µH, 13.4 A | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | Inductance1 µH | Performance Rated Current13.4 A | Saturation Current @ 10%13 A | Saturation Current @ 30%25.8 A | DC Resistance6.5 mΩ | Self Resonant Frequency51 MHz | MountSMT | –Check availability | |||
750811731 | SPECOffline Transformer, –, – | Simulation– | Availability – | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Offline Transformer | – | – | – | – | – | – | – | –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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