CM6500UN (1MHz PFC)
http://www.championmicro.com.tw
EPA/90+ ZVS-Like PFC CONTROLLER
Design for High Efficient Power Supply at both Full Load and Light Load
GENERAL DESCRIPTION
FEATURES
CM6500UN is a ZVS-Like Single PFC and it is designed to
meet EPA 90+ spec. (total efficiency). It has the following
key features.
Patents Pending
23V Bi-CMOS process.
Designed for EPA/90+efficiency
1.) Around 2% efficiency gain when the output load is
below 60% of the full load
Customer Programmable the Low Threshold of PGB
comparator at PGTHL pin
“Remember It was Light Load” function to improve the
efficiency and Hold up Time
2.) High Voltage 420V bulk capacitor can be reduced,
and also PFC Boost Capacitor ripple current can be
reduced
“Remember It was Full Load” function to improve the
efficiency and Hold up Time
3.) Turbo Speed PFC may reduce 420 Bulk Capacitor
size further
Clean Digital PFC Brown Out
All high voltage resistors can be greater than 5 Mega
ohm (5 Mega to 8 Mega ohm) to improve the no load
consumption.
4.) A PGB function is designed for interfacing to next
stage controller or the House Keeping IC at
secondary side. The PGB function pull low was
decide by IC inside. The PGB Pull high It has a
customer programmable by PGTHL low threshold.
Rail to rail CMOS Drivers with on, 24 ohm and off, 12
ohm with 17V zeners.
Fast Start-UP Circuit without extra bleed resistor to aid
VCC reaches 13V sooner.
5.) “Remember it was Light Load” function and
“Remember it was Full Load” function may reduce
PFC 420V Bulk Capacitor size further. It boosts the
total efficiency as well.
Low start-up current (50uA typ.)
Low operating current (2.1mA typ.)
Adjustable Long Delay Time for Line Sagging
(Up to 2 Second)
6.) IAC, Vrms, VFB pin resistor can be use > 5M
ohm. It will help No Load Consumption to reduce at
270VAC
17V VCC shunt regulator
Dynamic Soft PFC to ease the stress of the Power
Device and Ease the EMI-filter design.
7.) Better Power Factor and Better THD
8.) Clean Digital PFC Brown Out
Better Power Factor and Better THD
Average current mode control, continuous or
discontinuous boost leading edge PFC.
9.) Dynamic Soft PFC to ease the stress over the entire
external power device is reduced and EMI noise
reduced
Current fed Gain Modulator for improved noise immunity.
Gain Modulator is a constant maximum power limiter.
10.) Superior Surge Noise Immunity
Precision Current Limit, over-voltage protection, UVLO,
and soft start, and Reference OK.
CM6500UN is designed to meet the EPA/90+ regulation.
With the proper design, its efficiency of power supply can
easily approach 90+/92+.
2014/11/11 Rev. 1.0
Champion Microelectronic Corporation
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