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CM6903A PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 CM6903A
部品説明 Low Pin Count PFC/PWM CONTROLLER COMBO
メーカ Champion Microelectronic
ロゴ Champion Microelectronic ロゴ 

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CM6903A Datasheet, CM6903A PDF,ピン配置, 機能
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.
‹
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.
‹
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.
‹
‹
‹
‹
‹
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
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
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
APPLICATIONS
‹ Desktop PC
‹ AC Adaptor
‹ Open Frame
PIN CONFIGURATION
SIP-09 (Z09)
Front View
123456789
2008/10/20 Rev1.4
Champion Microelectronic Corporation
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