Мікросхема UCC28061 so-16

The UCC28061 is a dual-phase, transition-mode Power Factor Correction (PFC) pre-regulator. The UCC28061EVM is an evaluation module (EVM) with a 390-V, 300-W, dc output that operates from a universal input of 85 VRMS to 265 VRMS and provides power-factor correction. Throughout this document, the acronym EVM and the phrases evaluation board and evaluation module are synonymous with the UCC28061EVM. 1 2 3 4 Description The pre-regulator uses the UCC28061 PFC interleaved controller to shape the input current wave to provide power-factor correction. This device uses TI’s Natural Interleaving™ technology to interleave boost phases. This user’s guide provides the schematic, List of Materials, assembly drawing for a single-sided printed circuit board application, and test set-up information necessary to evaluate the UCC28061 in a typical PFC application. Thermal Requirements This evaluation module will operate up to 300 W without external cooling in ambient tempatures of 25°C. Electrical Characteristics Table 1 summarizes the electrical specifications of the UCC28061EVM. Table 1. UCC28061EVM Electrical Specifications PARAMETER RMS input voltage (ac line) Output voltage, VOUT Line frequency Power factor (PF) at maximum load Output power Full load efficiency CONDITIONS UCC28061EVM MIN TYP 85 47 0.9 AC line = 115 V AC line = 230 V Schematics 390 94% 97% UNITS MAX 265 63 300 VRMS V Hz W Figure 1 and Figure 2 show the schematics for this EVM. See the List of Materials for specific values. To evaluate inductor ripple currents, resistors R25 and R26 can be removed and replaced with current