Features: Patents Pending
u Pin to pin compatible with CM6800,CM6800A, ML4800 and FAN4800.
u 23V Bi-CMOS process.
u Designed for EPA/80++ efficiency.
u CM6802A/B : Selectable Boost output from 380V to 300V during light load.
u CM6802AH/BH: Selectable Boost output from 380V to 342V during light load.
u All high voltage resistors can be greater than 4.7 Mega ohm (4.7 Mega to 8 Mega ohm) to improve the no load consumption.
u Rail to rail CMOS Drivers with on, 60 ohm and off, 30 ohm for both PFC and PWM with two 17V zeners.
u Fast Start-UP Circuit without extra bleed resistor to aid VCC reaches 13V sooner.
u Low start-up current (55uA typ.)
u Low operating current (2.5mA typ.)
u 16.5V VCC shunt regulator
u Leading Edge Blanking for both PFC and PWM.
u fRTCT = 4*fpfc =4*fpwm for CM6802A//AH
u fRTCT = 4*fpfc =2*fpwm for CM6802B/BH
u Dynamic Soft PFC to ease the stress of the Power Device and Ease the EMI filter design.
u PFC Brown Out and PWM Brown Out
u Internally synchronized leading edge PFC and trailing edge PWM in one IC to Reduces ripple current in the 420V storage capacitor between the PFC and PWM sections.
u Low total harmonic distortion, THD and Power Factor approaches 1.0.
u Average current, continuous or discontinuous boost leading edge PFC.
u PWM configurable for current mode or feed-forward voltage mode operation.
u Current fed Gain Modulator for improved noise immunity.
u Gain Modulator is a constant maximum power limiter.
u Brown-out control, over-voltage protection, UVLO, and soft start, and Reference OK.
u PWM Short Circuit Protection
u Power Fold Back Protection
u Green Mode PWM for less no load consumption.
ApplicationEPA/80++ related Power Supply
u Desktop PC Power Supply
u Internet Server Power Supply
u LCD Power Supply
u PDP Power Supply
u IPC Power Supply
u UPS
u Battery Charger
u DC Motor Power Supply
u Monitor Power Supply
u Telecom System Power Supply
u Distributed Power
Specifications) Change RAC resistor (on pin 2, IAC) from the old value to a higher resistor value between 4.7 Mega ohms to 8 Mega ohms.
2.) Change RTCT pin (pin 7) from the existing value to RT=7.75K ohm and CT=1000pF to have fpfc=55Khz, fpwm=55Khz, frtct=220Khz.
3.) Adjust all high voltage resistor around 5 mega ohm or higher.
4.) VRMS pin (pin 4) needs to be 1.125V at VIN=85VAC for universal input application from line input from 85VAC to 270VAC. Both poles for the Vrms of the CM6802A/B/AH/BH needs to substantially slow than CM6800 about 5 to 10 times.
5.) At full load, the average Veao needs to around 4.5Vand the ripple on the Veao needs to be less than250mV.
6.) Soft Start pin (pin 5), the soft start current has been reduced from CM6800s 20uA to CM6802A/B/AH/BHs 10uA.Soft Start capacitor can be reduced to 1/2 from your original CM6800 capacitor.
DescriptionSwitching to CM6802A/B/AH/BH from your existing CM6800 family boards can gain the following advanced performances:
1.) Around 2% efficiency gain when the output load is below 40% of the full load.
2.) Hold Up time can be increased ~ 30% from the existing 6800 power supply.
3.) 420V bulk capacitor value may be reduced PFC boost ripple current can be reduced; therefore, the boost inductor core size maybe reduced.
4.) No Load Consumption can be reduced 290mW at 270VAC.
5.) PWM transformer size can be smaller.
6.) To design 12V, 5V and 3.3V output filters can be easy.
7.) The stress over the entire external power device is reduced and EMI noise maybe reduced.
8.) Monotonic Output design is easy and moreOf cause, the cost will be reduced.
CM6802A/B/AH/BH Data Sheet
