Texas Instruments

Description

UC1854, UC2854, UC3854 . SLUS336A JUNE 1998 REVISED DECEMBER 2016. UCx854 High-Power Factor Preregulator. 1. 1 Features. 1 Control Boost May 29, 2015 without the need for slope compensation, unlike peak current mode control. Designed in UTCs Bipolar process, the UTC UC3854 offers. Much of the information available for the UC3854 family of integrated circuits is also applicable to the UC3853. In particular, Unitrode Application Note U-134 block diagram of the popular UC3854 controller [ref. 2]. Fig 1. As seen in Fig 1 the heart of this existing PFC controller is an analog multiplier / divider. In order to. loop control scheme identical to. Boost- UC3854 can be used in same manner. . Possibility of isolation/step down using secondary inductor winding, if a way can