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Overview
| Topology | Flyback Converter |
| Input voltage | 10-100 V |
| Switching frequency | 80-250 kHz |
| Output 1 | 5 V / 2.5 A |
| Output 2 | 5 V / 3 A |
| IC revision | LT3748EMS |
Description
The LT®3748 is a switching regulator controller specificallydesigned for the isolated flyback topology and capable ofhigh power. It drives a low side external N-channel powerMOSFET from an internally regulated 7V supply. No thirdwinding or opto-isolator is required for regulation as thepart senses the isolated output voltage directly from theprimary-side flyback waveform.
Features
- 5V to 100V Input Voltage Range
- 1.9A Average Gate Drive Source and Sink Current
- Boundary Mode Operation
- No Transformer Third Winding or Opto-Isolator Required for Regulation
- Primary-Side Winding Feedback Load Regulation
- VOUT Set with Two External Resistors
- INTVCC Pin for Control of Gate Driver Voltage
- Programmable Soft Start
- Programmable Undervoltage Lockout
- Available in MSOP Package
Typical applications
- Military and High Temperature Applications
- High Power Automotive Supplies
- Isolated Industrial Power Supplies
- Telecom and Industrial
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | VIN | VOut1(V) | IOut1(A) | Vaux(V) | L(µH) | n | ISAT(A) | LS(µH) | VT(V (AC)) | Size | IC Reference | SamplesAvailability & Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 10 - 40 V (DC), 5 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 10 - 40 V (DC) | Output Voltage 15 V | Output Current 13 A | Auxiliary Voltage8 V | Inductance9.07 µH | Turns Ratio3:1:1.75 | Saturation Current8 A | Leakage Inductance0.25 µH | Insulation Test Voltage1500 V (AC) | SizeEP13 | IC ReferenceLT3575 & LT3748 | –Check availability | ||||
| SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 36 V (DC), 3.3 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 36 V (DC) | Output Voltage 13.3 V | Output Current 14 A | Auxiliary Voltage8 V | Inductance15 µH | Turns Ratio3:1:2.5 | Saturation Current5 A | Leakage Inductance0.3 µH | Insulation Test Voltage2500 V (AC) | SizeEP13 | IC ReferenceLT3575 & LT3748 | –Check availability | ||||
| SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 36 V (DC), 5 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 36 V (DC) | Output Voltage 15 V | Output Current 14 A | Auxiliary Voltage10 V | Inductance50 µH | Turns Ratio4:1:2 | Saturation Current3.85 A | Leakage Inductance1.2 µH | Insulation Test Voltage1500 V (AC) | SizeEP13 | IC ReferenceLT3575 & LT3748 | –Check availability | ||||
| SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 36 V (DC), 5 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 36 V (DC) | Output Voltage 15 V | Output Current 14 A | Auxiliary Voltage10 V | Inductance50 µH | Turns Ratio4:1:2 | Saturation Current3.7 A | Leakage Inductance1.2 µH | Insulation Test Voltage2500 V (AC) | SizeEP13 | IC ReferenceLT3575 & LT3748 | –Check availability | ||||
| SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 36 V (DC), 5 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 36 V (DC) | Output Voltage 15 V | Output Current 14 A | Auxiliary Voltage10 V | Inductance50 µH | Turns Ratio4:1:2 | Saturation Current3.7 A | Leakage Inductance1.2 µH | Insulation Test Voltage2500 V (AC) | SizeEP13 | IC ReferenceLT3575 & LT3748 | –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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