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CM6802AGIP PDF预览

CM6802AGIP

更新时间: 2024-10-28 06:48:11
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虹冠电子 - CHAMP 功率因数校正控制器
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25页 814K
描述
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER

CM6802AGIP 数据手册

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CM6802A/B/AH/BH (Dynamic Soft PFC/Green PWM)  
http://www.championmicro.com.tw  
EPA/80++ ZVS-Like PFC/PWM COMBO CONTROLLER  
Design for High Efficient Power Supply at both Full Load and Light Load  
GENERAL DESCRIPTION  
FEATURES  
Switching to CM6802A/B/AH/BH from your existing  
CM6800 family boards can gain the following advanced  
performances:  
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Patents Pending  
Pin to pin compatible with CM6800,CM6800A,  
ML4800 and FAN4800.  
1.) Around 2% efficiency gain when the output load is  
below 40% of the full load.  
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23V Bi-CMOS process.  
Designed for EPA/80++ efficiency.  
2.) Hold Up time can be increased ~ 30% from the  
existing 6800 power supply.  
CM6802A/B : Selectable Boost output from 380V to  
300V during light load.  
3.) 420V bulk capacitor value may be reduced PFC  
boost ripple current can be reduced; therefore, the  
boost inductor core size maybe reduced.  
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CM6802AH/BH: Selectable Boost output from 380V to  
342V during light load.  
4.) No Load Consumption can be reduced 290mW at  
270VAC.  
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.  
5.) PWM transformer size can be smaller.  
6.) To design 12V, 5V and 3.3V output filters can be  
easy.  
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Rail to rail CMOS Drivers with on, 60 ohm and off, 30  
ohm for both PFC and PWM with two 17V zeners.  
7.) The stress over the entire external power device is  
reduced and EMI noise maybe reduced.  
Fast Start-UP Circuit without extra bleed resistor to aid  
VCC reaches 13V sooner.  
8.) Monotonic Output design is easy and more…Of  
cause, the cost will be reduced.  
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Low start-up current (55uA typ.)  
Low operating current (2.5mA typ.)  
16.5V VCC shunt regulator  
CM6802A/B/AH/BH is pin to pin compatible with CM6800  
family.  
Beside all the goodies in the CM6800, it is designed to meet  
the EPA/80+ regulation. With the proper design, its  
efficiency of power supply can easily approach 85%.  
Leading Edge Blanking for both PFC and PWM.  
fRTCT = 4*fpfc =4*fpwm for CM6802A//AH  
fRTCT = 4*fpfc =2*fpwm for CM6802B/BH  
To start evaluating CM6802A/B/AH/BH from the exiting  
CM6800,CM6800A or ML4800 board, 6 things need to be  
taken care before doing the fine tune:  
Dynamic Soft PFC to ease the stress of the Power  
Device and Ease the EMI filter design.  
1.) 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.  
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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.  
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.  
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Low total harmonic distortion, THD and Power Factor  
approaches 1.0.  
3.) Adjust all high voltage resistor around 5 mega ohm  
or higher.  
Average current, continuous or discontinuous boost  
leading edge PFC.  
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.  
PWM configurable for current mode or feed-forward  
voltage mode operation.  
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Current fed Gain Modulator for improved noise immunity.  
Gain Modulator is a constant maximum power limiter.  
5.) At full load, the average Veao needs to around 4.5V  
and the ripple on the Veao needs to be less than  
250mV.  
Brown-out control, over-voltage protection, UVLO, and  
soft start, and Reference OK.  
6.) Soft Start pin (pin 5), the soft start current has been  
reduced  
from  
CM6800’s  
20uA  
to  
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PWM Short Circuit Protection  
CM6802A/B/AH/BH’s 10uA.Soft Start capacitor can  
be reduced to 1/2 from your original CM6800  
capacitor.  
Power Fold Back Protection  
Green Mode PWM for less no load consumption.  
2009/11/02 Rev. 1.4  
Champion Microelectronic Corporation  
1

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