ML4813 Datasheet | Micro Linear

April 1997 ML4813- Flyback Power Factor Controller GENERAL DESCRIPTION The ML4813 is a PWM controller designed for use in a discontinuous "flyback" or "buck-boost" type power factor correction (PFC) system for low power, low cost applications. The circuit includes a precision reference, oscillator, error amplifier, over-voltage parator, over-current parator, and an extra op-amp as well as a high current output. In addition, start-up is simplified by an under-voltage lockout circuit. In a typical application, the ML4813 functions as a voltage mode regulator. By maintaining a constant duty cycle, the current follows the input voltage, making the impedance of the entire circuit appear...