高效低成本(77+~82+)針對(duì)被動(dòng)PFC市場(chǎng)的主動(dòng)PFC的IC ,CM6805(CM6800簡(jiǎn)化版)

CM6805為CMC公司推出的又一款經(jīng)典的針對(duì),中低端被動(dòng)PFC市場(chǎng)的一款極具競(jìng)爭(zhēng)力的IC,此款I(lǐng)C最大的特點(diǎn),是秉承了CMC一貫的特色,在保持高效性的前提下,進(jìn)行了 COST DOWN,對(duì)電源的整體成本進(jìn)行了瘦身.相對(duì)于CM6800由16個(gè)腳位減少到10個(gè)腳位,因此減少周?chē)T多元器件的使用.

虹冠大陸指定代理商祝商祺!

聯(lián)系人:高生MSN:gaofeng@osea.com.cn

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stonegao

LV.2

2008-09-03 12:02

10-PIN Green-Mode PFC/PWM  Combo CONTROLLER - CM6805A

General Description
   The  CM6805A  is  the  Green-Mode  PFC/PWM  Combo controller for  Desktop PC and High  Density AC Adapter. For  the  power  supply,  itˇs  input  current  shaping  PFC performance could be very close to the performance of the CM6800  or   ML4800  leading  edge  modulation  average current topology.

      CM6805A  offers  the  use   of  smaller,  lower  cost  bulk capacitors, reduces power line loading and stress on the switching  FETs,  and  results  in  a  power  supply  fully compliant  to  IEC1000-3-2  specifications.  The  CM6805A includes circuits for the implementation of a leading edge modulation, input current shaping technique ¨boost〃 type PFC and a trailing edge modulation current, PWM.

     The  CM6805Aˇs  PFC  and  PWM  operate  at  the  same frequency, 100kHz. A PFC  OVP comparator shuts down the PFC section in the event of a sudden decrease in load. The  PFC  section  also  includes  peak  current  limiting  for enhanced system reliability.

         PFC has a PFCOFFB pin which can use for AC brown out application and determine the GMth to turn off PFC.

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Features

10-Pin SOIC package
Use RAC as the Startup resistor which can be > 2000K or higher at IAC pin
It can use the HV bipolar to start up the chip and it helps green mode.
Easy to configure into Boost Follower
Enable lowest BOM for power supply with PFC
Internally synchronized PFC and PWM in one IC
Patented slew rate enhanced voltage error amplifier with advanced input current shaping technique
Universal Line Input Voltage
CCM boost or DCM boost with leading edge modulation

PFC using Input Current Shaping Technique
Feed forward IAC pin to do the automatic slope compensation
PFCOVP, Precision -1V PFC ILIMIT, PFC Tri-Fault Detect comparator to meet UL1950

Low supply currents; start-up: 100uA typical, operating current: 2mA typical.
Synchronized leading PFC and trailing edge modulation PWM to reduce ripple current in the storage capacitor between the PFC and PWM sections and to reduce switching noise in the system
VINOK Comparator to guarantee to enable PWM when

PFC reach steady state
High efficiency trailing-edge current mode PWM
Exact 50% PWM maximum duty cycle
UVLO, REFOK, and brownout protection
Digital PFC and PWM soft start, ~10mS
Precision PWM 1.5V current limit for current mode operation
PFCOFFB pin to sense light load to turn off PFC or PFCOFFB pin to sense Input voltage as AC Brown Out

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Applications

Desktop PC

AC Adaptor

Open Frame

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gaofengkgb

LV.5

2008-12-17 09:14

@stonegao

10-PINGreen-ModePFC/PWM ComboCONTROLLER-CM6805A GeneralDescription The CM6805A is the Green-Mode PFC/PWM Combocontrollerfor DesktopPCandHigh DensityACAdapter.For the power supply, itˇs input current shaping PFCperformancecouldbeveryclosetotheperformanceoftheCM6800 or ML4800 leading edge modulation averagecurrenttopology. CM6805A offers the use of smaller, lower cost bulkcapacitors,reducespowerlineloadingandstressontheswitching FETs, and results in a power supply fullycompliant to IEC1000-3-2 specifications. The CM6805Aincludescircuitsfortheimplementationofaleadingedgemodulation,inputcurrentshapingtechnique¨boost〃typePFCandatrailingedgemodulationcurrent,PWM. The CM6805Aˇs PFC and PWM operate at the samefrequency,100kHz.APFC OVPcomparatorshutsdownthePFCsectionintheeventofasuddendecreaseinload.The PFC section also includes peak current limiting forenhancedsystemreliability. PFChasaPFCOFFBpinwhichcanuseforACbrownoutapplicationanddeterminetheGMthtoturnoffPFC.---------------------------------------------------------------------------------------------------------------------------------------------Features10-PinSOICpackageUseRACastheStartupresistorwhichcanbe>2000KorhigheratIACpinItcanusetheHVbipolartostartupthechipandithelpsgreenmode.EasytoconfigureintoBoostFollowerEnablelowestBOMforpowersupplywithPFCInternallysynchronizedPFCandPWMinoneICPatentedslewrateenhancedvoltageerroramplifierwithadvancedinputcurrentshapingtechniqueUniversalLineInputVoltageCCMboostorDCMboostwithleadingedgemodulationPFCusingInputCurrentShapingTechniqueFeedforwardIACpintodotheautomaticslopecompensationPFCOVP,Precision-1VPFCILIMIT,PFCTri-FaultDetectcomparatortomeetUL1950Lowsupplycurrents;start-up:100uAtypical,operatingcurrent:2mAtypical.SynchronizedleadingPFCandtrailingedgemodulationPWMtoreduceripplecurrentinthestoragecapacitorbetweenthePFCandPWMsectionsandtoreduceswitchingnoiseinthesystemVINOKComparatortoguaranteetoenablePWMwhenPFCreachsteadystateHighefficiencytrailing-edgecurrentmodePWMExact50%PWMmaximumdutycycleUVLO,REFOK,andbrownoutprotectionDigitalPFCandPWMsoftstart,~10mSPrecisionPWM1.5VcurrentlimitforcurrentmodeoperationPFCOFFBpintosenselightloadtoturnoffPFCorPFCOFFBpintosenseInputvoltageasACBrownOut---------------------------------------------------------------------------------------------------------------------------------------------ApplicationsDesktopPC ACAdaptor OpenFrame

為什么這么好的東東,沒(méi)有人頂一下,哈哈

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