Part # ML4826-2 datasheet

Part Manufacturer: Fairchild Semiconductor

Fairchild Semiconductor

Part Description: ML4826 PFC and Dual Output PWM Controller Combo

Part Details: ML4826PFC and Dual Output PWM Controller Combo Features General Description · Internally synchronized PFC and PWM in one IC The ML4826 is a high power controller for power factor · Low total harmonic distortion corrected, switched mode power supplies. PFC allows the · Low ripple current in the storage capacitor between the use of smaller, lower cost bulk capacitors, reduces power line PFC and PWM sections loading and stress on the switching FETs, and results in a · Average current, continuous boost, leading edge PFC power supply that fully complies with IEC1000-3-2 specifi- · High efficiency trailing edge PWM with dual totem-pole cations. The ML4826 includes circuits for the implementa- outputs tion of a leading edge, average current "boost" type power · Average line voltage compensation with brown-out factor correction and a trailing edge, pulse width modulator control (PWM) with dual totem-pole outputs. · PFC overvoltage comparator eliminates output "runaway" An over-voltage comparator shuts down the PFC section in due to load removal the event of a sudden decrease in load. The PFC section also · Current-fed multiplier for improved noise immunity includes peak current limiting and input voltage brown-out · Overvoltage protection, UVLO, and soft start protection. The PWM section can be operated in current or voltage mode at up to 250kHz and includes a duty cycle limit to prevent transformer saturation. Block Diagram 20 11 1 17 VEAO AGND IEAO POWER FACTOR CORRECTOR VCC VCCZ OVP V V FB VEA REF + 13.5V 7.5V 19 -

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ML4826-2.pdf Datasheet