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CM6805A_10 参数 Datasheet PDF下载

CM6805A_10图片预览
型号: CM6805A_10
PDF下载: 下载PDF文件 查看货源
内容描述: 10 -PIN绿色模式PFC / PWM组合控制器 [10-PIN Green-Mode PFC/PWM Combo CONTROLLER]
分类和应用: 功率因数校正控制器
文件页数/大小: 15 页 / 198 K
品牌: CHAMP [ CHAMPION MICROELECTRONIC CORP. ]
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CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
GENERAL DESCRIPTION
The CM6805A is the Green-Mode PFC/PWM Combo
controller for Desktop PC and High Density AC Adapter.
For the power supply, it’s 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 CM6805A’s PFC and PWM operate at the same
frequency, 67.5kHz. 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.
FEATURES
10-Pin SOIC package.
Use RAC around 4~8 Mega Ohm at IAC pin.
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
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;
leading
start-up:
PFC
and
100uA
trailing
typical,
edge
operating current: 2mA typical.
Synchronized
modulation PWM to reduce ripple current in the
storage capacitor between the PFC and PWM
sections and to reduce switching noise in the system
VIN-OK 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
PFC
using
Input
Current
Shaping
2010/04/20 Rev 1.4
Champion Microelectronic Corporation
Page 1