Update: 28 September, 2023
UC1852 provides a low-cost solution to active power-factor correction (PFC) for systems that would otherwise draw high peak current pulses from AC power lines. This circuit implements zero-current switched boost conversion, producing sinusoidal input currents with a minimum of external components, while keeping peak current substantially below that of fully-discontinuous converters. The UC1852 provides controlled switch on-time to regulate the output bulk DC voltage, an off-time defined by the boost inductor, and a zero-current sensing circuit to reactivate the switch cycle. Even though switching frequency varies with both load and instantaneous line voltage, it can be maintained within a reasonable range to minimize noise generation. The ability to obtain a power factor in excess of 0.99 makes the UC1852 an optimum choice for low-cost applications in the 50 to 5.
File format: PDF
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MD5 Checksum: 2D1E7FA868DCC1DF831A3878BA5E33F1
Publication date: 04 May, 2012
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PDF Link: TEXAS INSTRUMENTS UC1852 UC2852 UC3852 Data Sheet PDF