CM6903B
CM6903B is Low Pin Count PFC/PWM CONTROLLER COMBO manufactured by Champion Microelectronic.
DESCRIPTION
Low Pin Count PFC/PWM CONTROLLER BO
FEATURES
The CM6903B is a space-saving PFC-PWM controller for Patent Number #5,565,761, #5,747,977, #5,742,151, power factor corrected, switched mode power supplies that
#5,804,950, #5,798,635 offers very low start-up and operating currents. For the Pin to pin patible with FAN6903/4 power supply less than 500Watt, its input current shaping Enable lowest BOM for power supply with PFC
PFC performance could be very close to CM6800 or Internally synchronized PFC and PWM in one IC
ML4800 architecture.
Patented slew rate enhanced voltage error amplifier with advanced input current shaping technique
Power Factor Correction (PFC) offers the use of smaller, Universal Line Input Voltage lower cost bulk capacitors, reduces power line loading and CCM boost or DCM boost with leading edge modulation stress on the switching FETs, and results in a power supply
PFC using Input Current Shaping Technique fully pliant to IEC1000-3-2 specifications. The Feedforward IAC pin to do the automatic slope
CM6903B includes circuits for the implementation of a pensation leading edge, input current shaping technique “boost” type PFCOVP, PFC VCCOVP, Precision -1V PFC ILIMIT,
PFC and a trailing edge, PWM.
Tri-Fault Detect parator to meet UL1950
No bleed resistor required
The CM6903B’s PFC and PWM operate at the same Low supply currents; start-up: 100u A typical, operating frequency, 67.5k Hz. This higher frequency allows the user current: 2m A typical. to design with smaller PWM ponents while maintaining Synchronized leading PFC and trailing edge modulation the optimum operating frequency for the PFC. An PFC OVP
PWM to reduce ripple current in the storage capacitor parator shuts down the PFC section in the event of a between the PFC and PWM sections and to reduce sudden decrease in load. The PFC section also includes switching noise in the system peak current limiting for enhanced system...
