Texas Instruments UC3853 High Power Factor Preregulator UC3853DG4

The UC3853 High Power Factor Preregulator from Texas Instruments is an 8-pin device designed for efficient active power factor correction. It features a simplified architecture that reduces the need for external components, making it suitable for compact designs. The device incorporates a precision multiplier/squarer/divider circuit, voltage and current loop error amplifiers, and a precision voltage reference, enabling average current mode control with RMS line voltage compensation. The internal oscillator operates at 75 kHz and can be synchronized with downstream converters. Key protective features include an overvoltage protection comparator and a clamped gate driver that self-biases during undervoltage lockout. The UC3853 is specified for operation within a temperature range of 0°C to +70°C and is available in both plastic and ceramic dual in-line packages as well as small outline packages. Its maximum supply voltage is 40V, with a continuous output drive current of 0.125A and a peak output current of 0.5A. This device is suitable for applications requiring high power factor correction and minimal distortion across a wide input voltage range.