DESCRIPTION
COMBI-SYNC Secondary Side Synchronous Rectifier and Regulator FEATURES
Single controller performs synchronous rectification and post regulation Independent regulation of multiple outputs from a common secondary winding Turn on shoot through inherently eliminated Primary switch turns ON and OFF with zero current No synchronising or any other signals needed across the isolation boundary Eliminates the need for a secondary bias supply Independent soft start, ON/OFF, remote sense and current limit for each output Resistive or inductive current sensing with 2V current signal and 2.5V reference for external applications. 4.5 to 18V operation Max operating frequency to 1 MHz Low profile 16 pin TSSOP package Based on Semtech’s patented Combi Sync concept SC4901 Details of this unique topology are described in the Application Information section. Multiple outputs can be synchronously rectified and independently regulated by individual SC4901s. They can be turned on or off without affecting the primary or other outputs.
Semtech Corporation
