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GENERAL DESCRIPTION

The ML4803 is a space-saving controller for power factor corrected, switched mode power supplies that offers very low start-up and operating currents. Power Factor Correction (PFC) offers the use of smaller, lower cost bulk capacitors, reduces power line loading and stress on the switching FETs, and results in a power supply fully compliant to IEC1000-3-2 specifications. The ML4803 includes circuits for the implementation of a leading edge, average current ¡°boost¡± type PFC and a trailing edge, PWM.

FEATURES

¡öInternally synchronized PFC and PWM in one 8-pin IC

¡öPatented one-pin voltage error amplifier with advanced input current shaping technique

¡öPeak or average current, continuous boost, leading edge PFC (Input Current Shaping Technology)

¡öHigh efficiency trailing-edge current mode PWM

¡öLow supply currents; start-up: 150?A typ., operating: 2mA typ.

¡öSynchronized leading and trailing edge modulation

¡öReduces ripple current in the storage capacitor between the PFC and PWM sections

¡öOvervoltage, UVLO, and brownout protection

¡öPFC VCCOVP with PFC Soft Start