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
SIMPLIFIED BLOCK DIAGRAM (CM6500UN)
VREF
Bulk+
11
12
9
13
6
VCC
VREF
PGTHL
(PGB turn off set point)
VFB
PGB
GMv
VEAO
-
17.0V
Shunt
7.52V
REFERENCE
.
VCC
14
PGTHL
+
-
3Kohm
+
2.515V
2.348V
RV1 (Voltage1)
RV2 (Voltage2)
PGTHL-150mV
+
-
-
.
+
VFB
2.5V
2V
When Veao > 2.5V (RV1)(full load)
When Veao < 2.0V(RV2)(light load)
+
-
VFB
2.3V
+
2.5V
.
-
Vrms
+
-
AC High Line
Vrms
+
SS
2.5V
.
Vrms > AC High Line
-
PGB PULL LOW
Vrms Control PGB
PFC Brown Out
Vrms > Brown In
then PGB Pull Low
Vrms
4
+
-
.
Vrms < 1.0V Brown out
1.78V
Vrms > 1.78V Brown In
Blanking
1.0V
VFB
2.75V
2.6V
PFC OVP
+
VCC
AC Detect
IAC
Adjustable Sagging Delay
.
-
-
24 Ohm ON
S
R
Q
Q
PFC OUT
PFC Tri-Fault
10
+
0.4V
VFB
-
17V
ZENER
SS Discharge current 3uA
12 Ohm OFF
PFC ILIMIT
+
-1.25V
ISENSE
-
S
R
Q
Q
Green PFC
+
0.4V
VEAO
-
Dynamic Soft
PFC
VFB
380V-OK
PFC
-
VFB
2.3V
.
RTCT
PFCCLK=1
RTCT
Frequency
+
.
RAMP1
IAC
RTCT
7
2
VEAO
SUPPORT
11.0V
VCC
UVLO
10.25V
Vrms
Rmul
GND
Gain Modulator
8
ISENSE
3
PFC CMP
Imul
SS
-
+
GMi
.
-
Discharge 3uA
Sagging Delay 5V
VCC
10uA
Adjustable
Sagging Delay
+
VCC
380V OK
Rmul
380V OK
Charge
Current
10uA
Discharge by 70K
T
VREF ok SW OFF
PGB low SW OFF
VCC-5V
3uA(Typ)
Adjustable Sagging Delay =
X Css
5
SS
70K
PGB
REFOKB
IEAO
1
2014/11/11 Rev. 1.0
Champion Microelectronic Corporation
4
CHAMP [ CHAMPION MICROELECTRONIC CORP. ]
