The UC1854 provides active power factor correction for power sys-tems that otherwise would draw non-sinusoidal current from sinusoi-dal power lines。 This device implements all the control functions necessary to build a power supply capable of optimally using available power-line current while minimizing line-current distortion。To do this,the UC1854 contains a voltage amplifier, an analog multiplier/divider,a current amplifier,and a fixed-frequency PWM。In addition, the UC1854 contains a power MOSFET compatible gate driver, 7.5V ref-erence, line anticipator,load-enable comparator, low-supply detector,and over-current comparator。
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