Power Management
Switching Regulator
Flyback, Forward and Isolated Controllers
Space & Harsh Environment
Extended Temperature Plastic (H & MP)
Extended Temperature (H & MP) Switching Regulators
LT3748 - 100V Isolated Flyback Controller
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 Application
Description
The LT3748 is a switching regulator controller specifically designed for the isolated flyback topology and capable of high power. It drives a low side external N-channel power MOSFET from an internally regulated 7V supply. No third winding or opto-isolator is required for regulation as the part senses the isolated output voltage directly from the primary-side flyback waveform.
The LT3748 utilizes boundary mode to provide a small magnetic solution without compromising load regulation. Operating frequency is set by load current and transformer magnetizing inductance. The gate drive of the LT3748 combined with a suitable external MOSFET allow it to deliver load power up to several tens of watts from input voltages as high as 100V.
The LT3748 is available in a high voltage 16-lead MSOP package with four leads removed.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
MS-12
Order Info
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
|---|---|---|---|---|---|---|
| LT3748EMS#PBF | MSOP | 16 | E | $4.46 | $3.12 | View |
| LT3748EMS#TRPBF | MSOP | 16 | E | $3.18 | View | |
| LT3748HMS#PBF | MSOP | 16 | H | $5.66 | $3.71 | View |
| LT3748HMS#TRPBF | MSOP | 16 | H | $3.77 | View | |
| LT3748IMS#PBF | MSOP | 16 | I | $4.93 | $3.45 | View |
| LT3748IMS#TRPBF | MSOP | 16 | I | $3.51 | View | |
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1557A | LT3748 Demo Board: 30V to 75V input to an Isolated | $175.00 | |
| DC1694A | LT3748EMS Demo Board u 22V VIN 75V, VOUT | $175.00 | |
| DC1745A | OBSOLETE: Please Use DC1817B; LT3798 Demo Board in | $175.00 | |
| DC1860A | LT3748 Demo Board I Isolated Flyback Converter wit | $175.00 | |
| DC1860B | LT3748 Demo Board I Isolated Flyback Converter wit | Contact Factory | |
| Buy Now | |||
Applications
- Isolated Telecom Converters
- High Power Automotive Supplies
- Isolated Industrial Power Supplies
People Who Viewed This Product Also Viewed
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Simulate
LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.
To launch a ready to run LTspice demonstration circuit for this part:
- Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- Step 3: If LTspice IV does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As". After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu
To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Related models available in LTspice IV
LT3748
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
