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Overview
| Topology | Flyback Converter |
| IC revision | A |
Description
The LT®3798 is a constant-voltage/constant-current isolatedflyback controller that combines active power factorcorrection (PFC) with no opto-coupler required for outputvoltage feedback into a single-stage converter. A LT3798based design can achieve a power factor of greater than 0.97by actively modulating the input current, allowing compliancewith most Harmonic Current Emission requirements.The LT3798 is well suited for a wide variety of off-lineapplications. 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 outputpower levels up to 100W. In addition, the LT3798 can easilybe designed into high DC input applications.
Features
- Isolated PFC Flyback with Minimum Number ofExternal 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
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | VIN(V) | VOut1(V) | IOut1(A) | Vaux(V) | RDC 1(Ω) | RDC 2(Ω) | RDC 3(Ω) | RDC 4(Ω) | fswitch(kHz) | L(µH) | NPRI : NSEC : NAUX | ISAT(A) | VT(V (AC)) | L(mm) | W(mm) | H(mm) | Mount | Size | SamplesAvailability & Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 750312872 | SPECTransformer, 20 - 60, 28 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Transformer | Input Voltage 20 - 60 | Output Voltage 128 V | Output Current 14 A | Auxiliary Voltage24 V | DC Resistance 10.011 Ω | DC Resistance 20.035 Ω | DC Resistance 30.011 Ω | – | Switching Frequency 50 | Inductance14 µH | Turns Ratio1:1:0.8 | Saturation Current25.9 A | Insulation Test Voltage1500 V (AC) | Length39.6 mm | Width43.18 mm | Height30.84 mm | MountTHT | SizeETD34 | –Check availability | ||
 | 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 10.35 A | Auxiliary Voltage15 V | DC Resistance 15.1 Ω | DC Resistance 20.092 Ω | DC Resistance 31.35 Ω | – | Switching Frequency 100 | Inductance2000 µH | Turns Ratio6.67:1:1.67 | Saturation Current0.27 A | Insulation Test Voltage4500 V (AC) | Length15 mm | Width15.75 mm | Height18.5 mm | MountTHT | SizeEE13/6/6 | –Check availability | |||
 | SPECWE-OLLT Offline Flyback Transformers, 85 - 265 V (AC), 28 V | Availability – | 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 10.5 A | Auxiliary Voltage20 V | DC Resistance 12.4 Ω | DC Resistance 20.241 Ω | DC Resistance 31.55 Ω | – | Switching Frequency 100 | Inductance600 µH | Turns Ratio4:1:0.71 | Saturation Current1.75 A | Insulation Test Voltage4500 V (AC) | Length18.5 mm | Width16.5 mm | Height18.8 mm | MountTHT | SizeEE16/7/5 | –Check availability | |||
 | SPECWE-OLLT Offline Flyback Transformers, 85 - 265 V (AC), 24 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 85 - 265 V (AC) | Output Voltage 124 V | Output Current 12 A | Auxiliary Voltage24 V | DC Resistance 10.155 Ω | DC Resistance 20.125 Ω | DC Resistance 30.025 Ω | DC Resistance 40.185 Ω | Switching Frequency 60 - 400 | Inductance300 µH | Turns Ratio2:2:1:1 | Saturation Current3.5 A | Insulation Test Voltage4500 V (AC) | Length31 mm | Width31 mm | Height25 mm | MountTHT | SizeER28/14 | –Check availability | |||
| SPECWE-OLLT Offline Flyback Transformers, 85 - 265 V (AC), 125 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 85 - 265 V (AC) | Output Voltage 1125 V | Output Current 10.36 A | Auxiliary Voltage21.25 V | DC Resistance 10.6 Ω | DC Resistance 20.254 Ω | DC Resistance 30.11 Ω | – | Switching Frequency 150 | Inductance461 µH | Turns Ratio1:1:0.17 | Saturation Current3.15 A | Insulation Test Voltage4500 V (AC) | Length31 mm | Width31 mm | Height25 mm | MountTHT | SizeER28/14 | –Check availability | |||
| SPECWE-OLLT Offline Flyback Transformers, 85 - 265 V (AC), 85 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 85 - 265 V (AC) | Output Voltage 185 V | Output Current 10.4 A | Auxiliary Voltage20 V | DC Resistance 10.55 Ω | DC Resistance 21.23 Ω | DC Resistance 31.1 Ω | – | Switching Frequency 60 | Inductance400 µH | Turns Ratio1:1:0.24 | Saturation Current5.7 A | Insulation Test Voltage4500 V (AC) | Length31 mm | Width31 mm | Height25 mm | MountTHT | SizeER28/14 | –Check availability | |||
 | SPECWE-OLLT Offline Flyback Transformers, 85 - 265 V (AC), 18 V | Availability – | 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 15 A | Auxiliary Voltage18 V | DC Resistance 10.15 Ω | DC Resistance 20.008 Ω | DC Resistance 30.042 Ω | – | Switching Frequency 200 | Inductance300 µH | Turns Ratio6:1:1 | Saturation Current4 A | Insulation Test Voltage4500 V (AC) | Length39.6 mm | Width43.18 mm | Height30.48 mm | MountTHT | SizeETD34 | –Check availability | |||
| SPECWE-OLLT Offline Flyback Transformers, 85 - 265 V (AC), 90 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 85 - 265 V (AC) | Output Voltage 190 V | Output Current 11 A | Auxiliary Voltage19.8 V | DC Resistance 10.15 Ω | DC Resistance 20.223 Ω | DC Resistance 30.055 Ω | – | Switching Frequency 75 | Inductance100 µH | Turns Ratio1:1:0.22 | Saturation Current9 A | Insulation Test Voltage4500 V (AC) | Length39.6 mm | Width43.18 mm | Height30.48 mm | MountTHT | SizeETD34 | –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 11 A | Auxiliary Voltage17 V | DC Resistance 16.25 Ω | DC Resistance 20.016 Ω | DC Resistance 31.7 Ω | – | Switching Frequency 100 | Inductance2000 µH | Turns Ratio20:1:5 | Saturation Current0.35 A | 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), 14 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 114 V | Output Current 11 A | Auxiliary Voltage18 V | DC Resistance 11.85 Ω | DC Resistance 20.06 Ω | DC Resistance 31.35 Ω | – | Switching Frequency 100 | Inductance600 µH | Turns Ratio8:1:1.29 | Saturation Current1.75 A | Insulation Test Voltage4500 V (AC) | Length18 mm | Width16.5 mm | Height18 mm | MountTHT | SizeEE16/7/5 | –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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