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ML4812 - Power Factor Controller

General Description

The ML4812 is designed to optimally facilitate a peak current control boost type power factor correction system.

Special care has been taken in the design of the ML4812 to increase system noise immunity.

Key Features

  • s s Precision buffered 5V reference (± 0.5%) Current-input gain modulator reduces external components and improves noise immunity Programmable ramp compensation circuit 1A peak current totem-pole output drive Overvoltage comparator helps prevent output voltage “runaway” Wide common mode range in current sense comparators for better noise immunity Large oscillator amplitude for better noise immunity s s s s s BLOCK.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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April 1998 ML4812 Power Factor Controller GENERAL DESCRIPTION The ML4812 is designed to optimally facilitate a peak current control boost type power factor correction system. Special care has been taken in the design of the ML4812 to increase system noise immunity. The circuit includes a precision reference, gain modulator, error amplifier, overvoltage protection, ramp compensation, as well as a high current output. In addition, start-up is simplified by an under-voltage lockout circuit with 6V hysteresis. In a typical application, the ML4812 functions as a current mode regulator. The current which is necessary to terminate the cycle is a product of the sinusoidal line voltage times the output of the error amplifier which is regulating the output DC voltage.