CM6802BH,CM6802BH pdf中文资料,CM6802BH引脚图,CM6802BH电路

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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

Switching to CM6802A/B/AH/BH from your existing

CM6800 family boards can gain the following advanced

performances:

1.)

2.)

3.)

Around 2% efficiency gain when the output load is

below 40% of the full load.

Hold Up time can be increased ~ 30% from the

existing 6800 power supply.

420V bulk capacitor value may be reduced PFC

boost ripple current can be reduced; therefore, the

boost inductor core size maybe reduced.

No Load Consumption can be reduced 290mW at

270VAC.

PWM transformer size can be smaller.

To design 12V, 5V and 3.3V output filters can be

easy.

The stress over the entire external power device is

reduced and EMI noise maybe reduced.

Monotonic Output design is easy and more…Of

cause, the cost will be reduced.

FEATURES

Patents Pending

Pin to pin compatible

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.

with

CM6800,CM6800A,

4.)

5.)

6.)

7.)

8.)

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%.

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:

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.

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 4.5V

and the ripple on the Veao needs to be less than

250mV.

6.) Soft Start pin (pin 5), the soft start current has been

reduced

from

CM6800’s

20uA

to

CM6802A/B/AH/BH’s 10uA.Soft Start capacitor can

be reduced to 1/2 from your original CM6800

capacitor.

2009/11/02

Rev. 1.4

Champion Microelectronic Corporation

1

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