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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
- 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 750311564 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748 | 10 - 40 V (DC) | 5 | 3 | 8 | 9.07 | 3:1:1.75 | 8 | 0.25 | 1500 | EP13 | LT3575 & LT3748 | ||
| 750311458 | 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) | 3.3 | 4 | 8 | 15 | 3:1:2.5 | 5 | 0.3 | 2500 | EP13 | LT3575 & LT3748 | ||
| 750311423 | 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) | 5 | 4 | 10 | 50 | 4:1:2 | 3.85 | 1.2 | 1500 | EP13 | LT3575 & LT3748 | ||
| 750311457 | 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) | 5 | 4 | 10 | 50 | 4:1:2 | 3.7 | 1.2 | 2500 | EP13 | LT3575 & LT3748 | ||
| 750311689 | 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) | 5 | 4 | 10 | 50 | 4:1:2 | 3.7 | 1.2 | 2500 | EP13 | LT3575 & LT3748 |
| 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 |
|---|