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GENERAL DESCRIPTION

The ML4826 is a high power controller for power factor corrected, switched mode power supplies. PFC allows the use of smaller, lower cost bulk capacitors, reduces power line loading and stress on the switching FETs, and results in a power supply that fully complies with IEC1000-3-2 specifications. The ML4826 includes circuits for the implementation of a leading edge, average current “boost” type power factor correction and a trailing edge, pulse width modulator (PWM) with dual totem-pole outputs.

FEATURES

■Internally synchronized PFC and PWM in one IC

■Low total harmonic distortion

■Reduced ripple current in the storage capacitor between the PFC and PWM sections

■Average current, continuous boost, leading edge PFC

■High efficiency trailing edge PWM with dual totem-pole outputs

■Average line voltage compensation with brown-out control

■PFC overvoltage comparator eliminates output “runaway” due to load removal

■Current-fed multiplier for improved noise immunity

■Overvoltage protection, UVLO, and soft start