LTC3706 Not Recommended for New Designs
The LTC3706 is a PolyPhase capable secondary-side controller for synchronous forward converters. When used in conjunction with the LTC3705 gate driver...
Datasheet
LTC3706 on Analog.com

LT8311 Production
The LT8311 is used on the secondary side of a forward converter to provide synchronous MOSFET control and output voltage feedback through an opto-coupler...
Datasheet
LT8311 on Analog.com

LTC3705 Not Recommended for New Designs
The LTC3705 is a controller for a 2-switch forward converter and includes on-chip bottom and top gate drivers that do not require external transformers...
Datasheet
LTC3705 on Analog.com