The UC3854N is a power factor controller, it provides active-power factor correction for power systems that otherwise would draw nonsinusoidal current from sinusoidal 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 linecurrent distortion. To do this, the UC1854 contains a voltage amplifier, an analog multiplier and divider, a current amplifier, and a fixed-frequency PWM.
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