The LT
The LT8311 is a synchronous MOSFET control IC designed for use on the secondary side of forward converters. It provides output voltage feedback through an integrated 10mA opto-coupler driver. A unique feature is its 'preactive mode,' which allows control of secondary-side MOSFETs without requiring a traditional pulse transformer, operating in discontinuous conduction mode (DCM) at light loads.
| Wide Input Supply Range | 3.7V to 30V |
|---|---|
| Feedback Reference Voltage | 1.5% (Typical 1.227V) |
| Opto-Coupler Driver Current | 10mA |
| Operating Junction Temperature Range (Standard) | -40°C to 125°C |
No, its unique preactive mode allows control of secondary-side MOSFETs without requiring a traditional pulse transformer.
In Preactive Mode, the device operates with a frequency range from 100 kHz to 300 kHz.
The feedback voltage line regulation is 0.015% to 0.1% of FB Ref Voltage when Vin ranges from 3.7V to 30V.