High Power Factor Preregulator

The UC3853 provides simple, yet high performance active power factor correction. Using the same control technique as the UC1854 this 8-pin de- vice exploits a simplified architecture and an internal Oscillator to minimize external component count. The UC3853 incorporates a precision multi- plier/squarer/divider circuit, voltage and current loop error Amplifiers and a precision Voltage Reference to implement average current mode control with RMS line voltage compensation. This control technique maintains con- stant loop gain with changes in input voltage, which minimizes input line current distortion over the worldwide input voltage range. The internal 75kHz Oscillator includes an external Clock input, allowing syn- chronization to downstream converters. Additionally, the device features an overvoltage protection Comparator a clamped MOSFET Gate driver which self-biases low during undervoltage lockout, and low startup and supply current. These devices are available in 8-pin plastic and ceramic dual in-line (DIP) packages, and 8-lead small outline (SOIC) packages. The UC1853 is specified for operation from 55C to +125C, the UC2853 is specified for operation from 25C to +85C, and the UC3853 is specified for operation from 0C to +70C. By Texas Instruments
UC1853 's PackagesUC1853 's pdf datasheet

UC1853 Pinout, Pinouts
UC1853 pinout,Pin out
This is one package pinout of UC1853,If you need more pinouts please download UC1853's pdf datasheet.

UC1853 Application circuits
UC1853 circuits
This is one application circuit of UC1853,If you need more circuits,please download UC1853's pdf datasheet.

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