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Overview
| Topology | Flyback Converter |
| Input voltage | 10-100 V |
| Switching frequency | 80-250 kHz |
| Output 1 | 12 V / 3.8 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 | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SPEC | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 20 - 48 V (DC) | Output Voltage 112 V | Output Current 13.8 A | Auxiliary Voltage10 V | Inductance8 µH | Turns Ratio2:1:1 | Saturation Current18 A | Leakage Inductance0.4 µH | Insulation Test Voltage1500 V (AC) | SizeEFD25 | IC ReferenceLT3748 | |||||
| SPEC | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 30 - 75 V (DC) | Output Voltage 112 V | Output Current 12.5 A | Auxiliary Voltage10 V | Inductance14 µH | Turns Ratio2.5:1:0.83 | Saturation Current9.5 A | Leakage Inductance0.5 µH | Insulation Test Voltage1500 V (AC) | SizeEFD20 | IC ReferenceLT3748 | |||||
| SPEC | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 30 - 75 V (DC) | Output Voltage 112 V | Output Current 13.8 A | Auxiliary Voltage10 V | Inductance15 µH | Turns Ratio2.33:1:0.83 | Saturation Current18 A | Leakage Inductance0.55 µH | Insulation Test Voltage1500 V (AC) | SizeEFD25 | IC ReferenceLT3748 | |||||
| SPEC | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 36 V (DC) | Output Voltage 112 V | Output Current 11 A | Auxiliary Voltage8 V | Inductance100 µH | Turns Ratio3:1:0.667 | Saturation Current2.4 A | Leakage Inductance1.5 µH | Insulation Test Voltage1500 V (AC) | SizeEP13 | IC ReferenceLT3748 | |||||
| SPEC | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 36 V (DC) | Output Voltage 112 V | Output Current 11 A | Auxiliary Voltage8 V | Inductance100 µH | Turns Ratio3:1:0.667 | Saturation Current2.4 A | Leakage Inductance1.5 µH | Insulation Test Voltage2500 V (AC) | SizeEP13 | IC ReferenceLT3748 | |||||
| SPEC | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 37 - 57 V (DC) | Output Voltage 112 V | Output Current 12.1 A | Auxiliary Voltage12 V | Inductance37 µH | Turns Ratio2:1:1.1 | Saturation Current2.8 A | Leakage Inductance0.75 µH | Insulation Test Voltage1500 V (AC) | SizeEP13 | IC ReferenceLT3575 & LT3748 |