CM6802A数据手册Champion中文资料规格书

描述 Description

Switching  to  CM6802A/B/AH/BH  from    your  existing CM6800 family boards can gain the following advanced performances:

 1.)   Around2%efficiencygain whentheoutputloadis below40%ofthefull load.

 2.)   Hold Uptimecanbeincreased~ 30%fromthe existing6800 powersupply.

 3.)   420V bulk capacitor value may be reduced PFC boost ripplecurrentcanbereduced;therefore,the boostinductorcore      sizemaybereduced.

 4.)   NoLoadConsumptioncan bereduced 290mWat270VAC.

 5.)   PWMtransformersize canbesmaller.

6.)    Todesign12V,5Vand3.3Voutputfilterscan be easy.

 7.)    Thestressovertheentireexternalpowerdeviceis reducedand EMInoisemaybereduced.

 8.)   Monotonic Output design is easy and more¡KOf cause,thecostwillbereduced.

 CM6802A/B/AH/BHispinto pincompatiblewithCM6800family.

  BesideallthegoodiesintheCM6800,itisdesignedtomeet the  EPA/80+  regulation.  With  the  proper  design,  its efficiencyofpowersupplycaneasily approach85%.

TostartevaluatingCM6802A/B/AH/BHfromtheexiting CM6800,CM6800AorML4800board,6thingsneedtobe takencare beforedoingthefinetune:

1.)  ChangeRAC resistor(on pin2,IAC)fromtheold valueto ahigherresistorvalue between4.7Mega ohmsto8Megaohms.

 2.)  ChangeRTCTpin(pin7)fromtheexistingvalueto RT=7.75K   ohm   and   CT=1000pF   to   have fpfc=55Khz,fpwm=55Khz,frtct=220Khz.

3.)  Adjust allhighvoltageresistoraround5megaohm orhigher.

 4.)  VRMS  pin  (pin  4)   needs  to  be  1.125V  at VIN=85VACforuniversalinputapplicationfromline input from  85VACto270VAC.Bothpolesforthe Vrms   of    the   CM6802A/B/AH/BH   needs   to substantiallyslowthanCM6800about5to 10times.

5.)  Atfullload,theaverageVeaoneedstoaround4.5VandtherippleontheVeao needstobelessthan250mV.

 6.)  SoftStartpin(pin5),thesoftstartcurrenthasbeen reduced from CM6800¡¦s  20uAto CM6802A/B/AH/BH¡¦s10uA.SoftStartcapacitorcan be reduced to 1/2 from  your original  CM6800 capacitor.

特性 Features

·Patents Pending
·Pin to pin compatible with CM6800,CM6800A, ML4800 and FAN4800.
·23V Bi-CMOS process.
·Designed for EPA/80++ efficiency.
·CM6802A/B : Selectable Boost output from 380V to 300V during light load.
·CM6802AH/BH: Selectable Boost output from 380V to 342V during light load.
·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.
·Rail to rail CMOS Drivers with on, 60 ohm and off, 30 ohm for both PFC and PWM with two 17V zeners.
·Fast Start-UP Circuit without extra bleed resistor to aid VCC reaches 13V sooner.
·Low start-up current (55uA typ.)
·Low operating current (2.5mA typ.)
·16.5V VCC shunt regulator
·Leading Edge Blanking for both PFC and PWM.
·fRTCT = 4*fpfc =4*fpwm for CM6802A//AH
·fRTCT = 4*fpfc =2*fpwm for CM6802B/BH
·Dynamic Soft PFC to ease the stress of the Power Device and Ease the EMI filter design.
·PFC Brown Out and PWM Brown Out
·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.
·Low total harmonic distortion, THD and Power Factor approaches 1.0.
·Average current, continuous or discontinuous boost leading edge PFC.
·PWM configurable for current mode or feed-forward voltage mode operation.
·Current fed Gain Modulator for improved noise immunity.
·Gain Modulator is a constant maximum power limiter.
·Brown-out control, over-voltage protection, UVLO, and soft start, and Reference OK.
·PWM Short Circuit Protection
·Power Fold Back Protection
·Green Mode PWM for less no load consumption.

应用 Application

·     EPA/80++relatedPowerSupply
·     DesktopPC PowerS·pply
·      Internet Server Power Supply
·     LCDPowerSupply
·      PDPPowerSupply
· IPC Power Supply
·     UPS
·     Battery Charger
·     DCMotorPowerSupply
·     MonitorPowerSupply
·      Telecom System Power Supply
·     DistributedPower