The LT3748 is a high input voltage isolated flyback DC/DC controller that does not require an opto-isolator, third winding or signal transformer for feedback. The output voltage is sensed from the primary-side flyback signal, and is set with two external resistors and the transformer turns ratio. The LT3748 operates over a 5V to 100V input voltage range, drives an external N-channel power MOSFET and maintains better than ±5% overall regulation.
The LT3748 is a high input voltage isolated flyback DC/DC controller that does not require an opto-isolator, third winding or signal transformer for feedback. It operates over a 5V to 100V input voltage range and drives an external N-channel power MOSFET. The output voltage is sensed from the primary-side flyback signal and set with two external resistors and the transformer turns ratio. It features a 1.9A onboard gate driver and boundary mode operation. The transformer is the only part crossing the isolation barrier, making it suitable for off-the-shelf transformer applications.
| Input Voltage Range | 5V to 100V |
|---|---|
| Output Voltage Sensing | Primary-Side Winding |
| Output Voltage Setting | Two External Resistors and Transformer Turns Ratio |
| Onboard Gate Driver | 1.9A |
| Regulation Accuracy | Better than ±5% |
The LT3748 operates over a 5V to 100V input voltage range.
No, the LT3748 does not require an opto-coupler.
The output voltage is set with two external resistors and the transformer turns ratio.
The LT3748 has a 1.9A onboard gate driver.