LTC3706 - Secondary-Side Synchronous Forward Controller With Polyphase Capability

The LTC3706 is a PolyPhase capable secondary-side controller for synchronous forward converters. When used in conjunction with the LTC3705 Gate driver and primary-side controller, the part creates a complete isolated power supply that combines the power of PolyPhase operation with the speed of secondary-side control. The LTC3706 has been designed to simplify the design of highly efficient, secondary-side forward converters. Working in concert with the LTC3705 the LTC3706 forms a robust, self-starting converter that eliminates the need for the separate bias Regulator that is commonly used in secondary-side control applications. In addition, a proprietary scheme is used to multiplex Gate drive signals and DC bias power across the isolation barrier through a single, tiny pulse transformer. The LTC3706 provides remote sensing, accurate power good and overvoltage monitoring circuits to support precision, high current applications. A linear Regulator controller with thermal protection is also provided to simplify the generation of secondary-side bias voltage.
The LTC3706 is available in a 24-lead SSOP package.
By Linear Technology Corporation