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16
VEAO
GMv
+
.
2.5V
-
VFB
15
GAIN
MODULATOR
IAC
2
VRMS
4
ISENSE
3
PFC
RAMP1
7
2010/08/03
Rev. 1.2
1
IEAO
Rmul
GMi
PFC CMP
+
.
+
-
-
Rmul
PFC RAMP
PFCCLK
.
Figure 1. PFC Section Block Diagram
Champion Microelectronic Corporation
CM6800T
(Turbo-Speed PFC+Green PWM)
EPA/85+ PFC+PWM COMBO CONTROLLER
Design for High Efficient Power Supply
PFC OVP
VFB
+
.
2.75V
-
PFC Tri-Fault
0.5V
+
VFB
-
PFC ILIMIT
-1.0V
+
-
ISENSE
Green PFC
0.3V
+
-
VEAO
13
VCC
16.5V
Zener
7.5V
REFERENCE
S
Q
R
Q
MPPFC
S
Q
R
Q
MNPFC
VREF
14
VCC
PFC OUT
12
17V
ZENER
18
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