LT3837 - Isolated No-Opto Synchronous Flyback Controller
The LT3837 is an isolated switching regulator controller designed for medium power flyback topologies. A typical application is 10W to 60W with the part powered from a DC supply.
The LT3837 is a current mode controller that regulates an output voltage based on sensing the secondary voltage via a transformer winding during flyback. This allows for tight output regulation without the use of an optoisolator, improving dynamic response and reliability. Synchronous rectification increases converter efficiency and improves output cross regulation in multiple output converters.
The LT3837 operates in forced continuous conduction mode which improves cross regulation in multiple winding applications. Switching frequency is user programmable and can be externally synchronized. The part also has load compensation, undervoltage lockout and soft-start circuitry.
The LT3837 is available in a thermally enhanced 16-pin TSSOP package.
Features
Typical Application   | Applications
Packaging |
Order Information
| Part Number | Package | Temp | Price(1-99) | Price (1k)* |
|---|---|---|---|---|
| LT3837EFE#PBF | TSSOP-16 | E | $4.43 | $3.10 |
| LT3837EFE#TRPBF | TSSOP-16 | E | $3.16 | |
| LT3837IFE#PBF | TSSOP-16 | I | $4.69 | $3.28 |
| LT3837IFE#TRPBF | TSSOP-16 | I | $3.34 |
Demo Boards
| Part Number | Description | Price |
|---|---|---|
| DC1038A-A | LT3837EFE | 9V -36V input to 3.3V at 10A Sync. Flyback Converter | $225.00 |
| DC1038A-B | LT3837EFE | 9V -36V input to 5V at 7A Sync. Flyback Converter | $200.00 |
| DC1038A-C | LT3837EFE | 9V -36V input to 12V at 3A Sync. Flyback Converter | $175.00 |
| DC950A-B | LT3837EFE Demo Board | 9V ≤ Vin ≤ 36V, Vout: 5V/2A, 3.3V/3A, 2.5V/3A | $150.00 |
