Isolated Feedback Generator

  The UC1901 family is designed to solve many of the problems associated with closing a feedback control loop across a voltage isolation boundary. As a stable and reliable alternative to an optical coupler, these devices feature an amplitude modulation system which allows a loop error signal to be coupled with a small RF Transformer or Capacitor The programmable, high-frequency Oscillator within the UC1901 series permits the use of smaller, less expensive Transformers which can readily be built to meet the isolation requirements of today's line-operated power systems. As an alternative to RF operation, the external clock input to these devices allows synchronization to a system clock or to the switching frequency of a SMPS. An additional feature is a status monitoring circuit which provides an activelow output when the sensed error voltage is within ?10% of the reference. The DRIVERA output, DRIVERB output, and STATUS output are disabled until the input supply has reached a sufficient level to allow proper operation of the device. Since these devices can also be used as a DC driver for optical couplers, the benefits of 4.5 to 40V supply operation, a 1% accurate reference, and a high gain general purpose amplifier offer advantages even though an AC system may not be desired.
Item: UC3901
File Size : 73 KB
Pages : 13 Pages

Other Part Numbers in this pdf file

UC3901QTRG3   UC3901QG3   UC3901NG4   UC3901DWG4   UC3901DTRG4   UC3901DG4  
Texas Instruments Incorporated
Draw UC3901 Schematic Online for Free