توضیحات
آي سي CM6802ubhx يک اصلاح کننده ضريب توان از نوع (LOW POWER) مي باشد که از داراي محافظ اضافه ولتاژ و سافت استارت ميباشد.
کاربرد ها:
1- منبع تغذيه کامپيوتر هاي خانگي و لپ تاپ
2.منبع تغذيه هاي سرور هاي اينترنت
3.منبع تغذيه ي LCD
4.منبع تغذيه ي PDP
.5منبع تغذيه ي IPC
.6ساخت UPS
7.شارژر انواع باطري
8.منبع تغذيه ي ابزارالات مانيتورينگ
9.منبع تغذيه ي سيستم هاي مخابراتي
Description
The CM6802 is a green PFC/PWM. It is the new generation
of ML4802, ML4841, ML4801 and ML4824-2. Its system
clock frequency is generated by the external RT and CT,
and then its PWM frequency is 50% of the clock and its
PFC frequency is 25% of the clock. CM6802 is designed to
be pin-pin compatible with CM6800 family, ML4800 family
and ML4824 family. Its PWM (DC to DC section) can be
easily configured to Voltage Mode or Current Mode. The
green mode function can easily be designed so during the
no load condition, its input power can be less than 0.75Watt
without shutting off PFC. Its PFC green mode threshold and
the PWM green mode threshold can separately set by
selecting the proper the RC filter at ISENSE pin (pin3) and
CT on RAMP 1 pin (pin 7). Power Factor Correction (PFC)
allows the use of smaller, lower cost bulk capacitors,
reduces power line loading and stress on the switching
FETs, and results in a power supply that fully compiles with
IEC-1000-3-2 specifications. Intended as a BiCMOS
version of the industry-standard CM6800, CM6802 includes
circuits for the implementation of leading edge, average
current, “boost” type power factor correction and a trailing
edge, pulse width modulator (PWM). Both PFC and PWM
Gate-driver with 0.5A capabilities minimizes the need for
external driver circuits. Low power requirements improve
efficiency and reduce component costs.
An over-voltage comparator shuts down the PFC section in
the event of a sudden decrease in load. The PFC section
also includes peak current limiting and input voltage
brownout protection. The PWM section can be operated in
current or voltage mode, at up to 250kHz, and includes an
accurate 50% duty cycle limit to prevent transformer
saturation.
When RAMP1 is 280KHz, fpfc is 70KHz and fpwm is
140KHz.
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