Datasheet > CM6903A_08

CM6903A_08

更新时间： 2024-01-02 13:04:18

品牌	Logo	应用领域
虹冠电子 - CHAMP		功率因数校正控制器
页数	文件大小	规格书
15页	231K
描述
Low Pin Count PFC/PWM CONTROLLER COMBO

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CM6903A_08 数据手册

CM6903A

Low Pin Count PFC/PWM CONTROLLER COMBO

GENERAL DESCRIPTION

FEATURES

The CM6903A is a space-saving PFC-PWM controller

for power factor corrected, switched mode power supplies

that offers very low start-up and operating currents. For the

power supply less than 500Watt, its input current shaping

PFC performance could be very close to CM6800 or

ML4800 architecture.

Patent Number #5,565,761, #5,747,977, #5,742,151,

#5,804,950, #5,798,635

Pin to pin compatible with FAN6903/4

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

Power Factor Correction (PFC) 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 CM6903A includes circuits for the implementation of a

leading edge, input current shaping technique “boost” type

PFC and a trailing edge, PWM.

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, PFC VCCOVP, Precision -1V PFC ILIMIT,

Tri-Fault Detect comparator to meet UL1950

No bleed resistor required

The CM6903A’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.

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

UVLO, REFOK, and brownout protection

Digital PWM softstart: CM6903A (10ms)

Precision PWM 1.5V current limit for current mode

operation

PIN CONFIGURATION

APPLICATIONS

SIP-09 (Z09)

Front View

Desktop PC

AC Adaptor

Open Frame

2008/10/20 Rev1.4

Champion Microelectronic Corporation

Page 1

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