Transcription of U-134 APPLICATION NOTE - Texas Instruments
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U-134 APPLICATION NOTE - Texas Instruments
U-134 . APPLICATION NOTE. UC3854 Controlled Power Factor Correction Circuit Design PHILIP C. TODD. ABSTRACT. This APPLICATION Note describes the concepts and design of a boost preregulator for power factor correc- tion. This note covers the important specifications for power factor correction, the boost power circuit de- sign and the UC3854 integrated circuit which controls the converter. A complete design procedure is given which includes the tradeoffs necessary in the process. This design procedure is directly applicable to the UC3854A/B as well as the UC3854. The recommendations in Unitrode Design Note DN-39 cover other ar- eas of the circuit and, while not discussed here, must be considered in any design. This APPLICATION note supersedes APPLICATION Note U- 125 "Power Factor Correction With the UC3854.. INTRODUCTION the input current waveform with respect to the input voltage waveform. The phase displacement of the The objective of active power factor correction is to voltage and current is the classic definition of make the input to a power supply look like a simple power factor which is the cosine of the phase angle resistor.
APPLICATION NOTE U-134 boost power factor corrector is the same as that of a dc to dc boost converter. There is a diode bridge ahead of the inductor to rectify the AC input volt-
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