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ML4802

Fairchild
Part Number ML4802
Manufacturer Fairchild
Description PFC/PWM Controller Combo with Green Mode
Published May 7, 2005
Detailed Description December 2000 PRELIMINARY ML4802 PFC/PWM Controller Combo with Green Mode GENERAL DESCRIPTION The ML 4802 is a controll...
Datasheet PDF File ML4802 PDF File

ML4802
ML4802

Overview
December 2000 PRELIMINARY ML4802 PFC/PWM Controller Combo with Green Mode GENERAL DESCRIPTION The ML 4802 is a controller for power factor corrected, switched mode power supplies that offers Green Mode operation and reduced start-up and operating currents.
Green Mode is an efficiency improving circuit feature which operates automatically in low power situations.
This feature helps meet the demands of Energy Star™ programs.
Power Factor Correction (PFC) offers the use of lower cost bulk capacitors, reduces power line loading and stress on the switching FETs.
The ML4802 includes circuits for the implementation of a leading edge, average current, “boost” type power factor corrector and a trailing edge Pulse Width Modulator (PWM).
The PFC frequency of the ML4802 is automatically synchronized to be one half that of the PWM.
This technique allows the user to design with smaller PWM components while maintaining the optimum operating frequency for the PFC.
An over-voltage comparator shuts down the PFC section in the event of a sudden decrease in load.
The PFC section also includes peak current limiting and brown-out protection.
s s FEATURES Internally synchronized PFC and PWM in one IC Green Mode maximizes efficiency during low power standby operation Low supply current (Start-up 200µA typ.
, operating 5.
5mA typ.
) Average current continuous boost leading edge PFC High efficiency trailing edge PWM can be configured for current mode operation Reduced ripple current in the storage capacitor between the PFC and PWM sections PFC overvoltage comparator eliminates output “runaway” due to load removal Current fed gain modulator for improved noise immunity Overvoltage protection, UVLO, and soft start s s s s s s s BLOCK DIAGRAM VEAO 16 IEAO 1 POWER FACTOR CORRECTOR + VCC 13 VEA VFB 15 2.
5V IAC VRMS ISENSE RAMP 1 2 4 3 8 + 1.
8kΩ + – IEA PFC CONTROLLER 8V 2.
75V - OVP 7.
5V REFERENCE 14 VREF GAIN MODULATOR 1.
8kΩ -1V + - PFC ILIMIT PFC OUTPUT DRIVER 12 PFC OUT ÷2 ...


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