LT3748 - 100V Isolated Flyback Controller
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.
Features
Typical Application  | Applications
Packaging |
| Part Number | Package | Temp | Price(1-99) | Price (1k)* |
|---|---|---|---|---|
| LT3748EMS#PBF | MS-16 | E | $4.46 | $3.12 |
| LT3748EMS#TRPBF | MS-16 | E | $3.18 | |
| LT3748HMS#PBF | MS-16 | H | $5.66 | $3.71 |
| LT3748HMS#TRPBF | MS-16 | H | $3.77 | |
| LT3748IMS#PBF | MS-16 | I | $4.93 | $3.45 |
| LT3748IMS#TRPBF | MS-16 | I | $3.51 | |
| LT3748MPMS#PBF | MS-16 | MP | $13.22 | $9.25 |
| LT3748MPMS#TRPBF | MS-16 | MP | $9.31 |
Demo Boards
| Part Number | Description | Price |
|---|---|---|
| DC1557A | LT3748EMS Isolated Demo Board | 30V Vin 75V; Vout = 12V @ 1A | $175.00 |
| DC1694B | LT3748EMS Isolated Demo Board | No-Opto Flyback, 22V ≤ VIN ≤ 75V; VOUT = 12V @ 2.5A | $175.00 |
| DC1860B | LT3748EMS Isolated Demo Board | 10V ≤ Vin ≤ 15V; Vout = 52.5V @ 0.7A | $175.00 |
| DC1961A | LT8309ES5/LT3748EMS Isolated Demo Board | 36V ≤ VIN ≤ 72V; VOUT = 12V @ 5A | $175.00 |
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- R530 - Reliability Data
- 48V No-Opto Isolated Applications
- No-Opto Isolated Flyback Converters
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- Isolated Power Supplies Made Easy
- 100V Flyback Controller Now Offered in Military -55°C to 150°C MP Grade
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- LT3748 Footprints and Symbols
- Isolated Power Your Way
- LT3748 Demo Circuit - 100V No Opto Isolated Flyback Controller (48V to 12V @ 2A)
- LT3748 Demo Circuit - Automotive Isolated Flyback Controller (6-45V to 5V @ 2A)
- LT8309/LT3748 Demo Circuit - 40W, 5V Isolated Telecom Supply (36-72V to 5V @ 8A)
- LT8309/LT3748 Demo Circuit - 60W, 12V Output, Isolated Telecom Supply (36-72V to 12V @ 5A)
