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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
- Isolated Industrial Power Supplies
- Telecom and Industrial
- High Power Automotive Supplies
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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 750311590 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | 20 - 48 V (DC) | 12 | 3.8 | 10 | 8 | 2:1:1 | 18 | 0.4 | 1500 | EFD25 | LT3748 | ||
| 750311607 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | 30 - 75 V (DC) | 12 | 2.5 | 10 | 14 | 2.5:1:0.83 | 9.5 | 0.5 | 1500 | EFD20 | LT3748 | ||
| 750311594 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | 30 - 75 V (DC) | 12 | 3.8 | 10 | 15 | 2.33:1:0.83 | 18 | 0.55 | 1500 | EFD25 | LT3748 | ||
| 750311424 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | 36 V (DC) | 12 | 1 | 8 | 100 | 3:1:0.667 | 2.4 | 1.5 | 1500 | EP13 | LT3748 | ||
| 750311456 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | 36 V (DC) | 12 | 1 | 8 | 100 | 3:1:0.667 | 2.4 | 1.5 | 2500 | EP13 | LT3748 | ||
| 750311439 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | 37 - 57 V (DC) | 12 | 2.1 | 12 | 37 | 2:1:1.1 | 2.8 | 0.75 | 1500 | EP13 | LT3575 & LT3748 |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 750311590 | SPEC | |
| 750311607 | SPEC | |
| 750311594 | SPEC | |
| 750311424 | SPEC | |
| 750311456 | SPEC | |
| 750311439 | SPEC |
| Samples |
|---|
| 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 |
|---|