Secondary-Side Synchronous Forward Controller

The LTC3726 is a secondary-side controller for synchronous forward converters. When used in conjunction with the LTC3705/LTC3725 gate driver and primary-side controllers, the part creates a complete isolated power supply that combines the simplicity of OPTI-LOOP® compensation with the speed of secondary-side control.

The LTC3726 has been designed to simplify the design of highly efficient, secondary-side forward converters. Working in concert with the LTC3705 or LTC 3725, the LTC3726 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 LTC3726 is available in a 16-lead SSOP package.

Applications

* Isolated 48V Telecommunication Systems

* Internet Servers and Routers

* Distributed Power Step-Down Converters

* Automotive and Heavy Equipment

* Secondary-Side Control for Fast Transient Response

* Self-Starting Architecture Eliminates Need for Separate Bias Regulator

* Proprietary Gate Drive Encoding Scheme Reduces System Complexity

* Current Mode Control Ensures Current Sharing

* PLL Fixed Frequency: 100kHz to 500kHz

* ±1% Output Voltage Accuracy

* OPTI-LOOP Compensation

* Available in a Narrow 16-Lead SSOP Package