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Overview
| Topology | Flyback Converter |
| Input voltage | 10-40 V |
| Switching frequency | 80-250 kHz |
| Output 1 | 15 V / 2 A |
| Output 2 | 15 V / 3 A |
| Output 3 | 15 V / 1 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
- High Power Automotive Supplies
- Isolated Industrial Power Supplies
- Telecom and Industrial
- Military and High Temperature Applications
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Product series | VIN | VOut1 (V) | IOut1 (A) | Vaux (V) | L (µH) | n | ISAT (A) | LS (µH) | VT (V (AC)) | Size | IC Reference | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 750311624 | SPEC | 7 files | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | 10 - 40 V (DC) | 15 | 1 | 8 | 9 | 1.5:1:0.5 | 8 | 0.25 | 1500 | EP13 | LT3575 & LT3748 | ||
| 750311599 | SPEC | 7 files | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | 20 - 48 V (DC) | 15 | 2 | 10 | 8 | 1.5:1:0.67 | 12 | 1 | 1500 | EFD20 | LT3748 | ||
| 750311591 | SPEC | 7 files | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | 20 - 48 V (DC) | 15 | 3 | 10 | 8 | 1.5:1:0.67 | 20 | 0.4 | 1500 | EFD25 | LT3748 | ||
| 750311600 | SPEC | 7 files | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | 30 - 75 V (DC) | 15 | 2 | 10 | 12 | 2:1:0.67 | 11 | 0.4 | 1500 | EFD20 | LT3748 | ||
| 750311595 | SPEC | 7 files | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | 30 - 75 V (DC) | 15 | 3 | 10 | 12 | 2:1:0.8 | 16 | 0.4 | 1500 | EFD25 | LT3748 |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Product series | VIN | VOut1 (V) | IOut1 (A) | Vaux (V) | L (µH) | n | ISAT (A) | LS (µH) | VT (V (AC)) | Size | IC Reference | Samples |
|---|