Part # ML4841 datasheet

Part Manufacturer: Fairchild Semiconductor

Fairchild Semiconductor

Part Description: ML4841 Variable Feedforward PFC PWM Controller Combo

Part Details: ML4841Variable Feedforward PFC/PWM Controller Combo Features General Description · Internally synchronized PFC and PWM in one IC The ML4841 is a controller for power factor corrected, · Low total harmonic distortion switched mode power supplies. Power Factor Correction · Reduces ripple current in the storage capacitor between (PFC) allows the use of smaller, lower cost bulk capacitors, the PFC and PWM sections reduces power line loading and stress on the switching FETs, · Average current, continuous mode, boost type, leading and results in a power supply that fully complies with edge PFC IEC1000-2-3 specifications. The ML4841 includes circuits · High efficiency trailing edge PWM can be configured for for the implementation of a leading edge, average current, current mode or voltage mode operation "boost" type power factor correction, and a trailing edge, · Average line voltage compensation with brown-out pulse width modulator (PWM). control The PFC frequency of the ML4841 is automatically set at · PFC overvoltage comparator eliminates output half that of the PWM frequency generated by the internal "runaway" due to load removal oscillator. This technique allows the user to design with · Current fed multiplier for improved noise immunity smaller output components while maintaining the optimum · Overvoltage protection, UVLO, and soft start operating frequency for the PFC. An over-voltage compara-tor shuts down the PFC section in the event of a sudden decrease in load. The PFC section also includes peak current limiting and input voltage brown-out protection. Block Diagram 16 1 13 VEAO IEAO POWER FACTOR CORRECTOR VCC VCCZ OVP V V FB VEA REF + 13.5V 7.5V 15 - IEA 3.5k

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ML4841.pdf Datasheet