CM6800
LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO
TYPICAL PERFORMANCE CHARACTERISTIC
100
90
127
120
113
106
99
80
70
60
50
40
30
20
10
0
92
85
78
71
64
57
-500
0
500
2
2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9
VFB (V)
3
ISENSE(mV)
Voltage Error Amplifier (gmv) Transconductance
Current Error Amplifier (gmi) Transconductance
2.2
2
0.4
0.35
0.3
1.8
1.6
1.4
1.2
1
0.25
0.2
0.15
0.1
0.8
0.6
0.4
0.2
0
0.05
0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
VRMS (V)
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
VRMS (V)
Gain Modulator Transfer Characteristic (K)
Gain
- 1
I
GAINMOD −I
I
SENSE −IOFFSET
K =
OFFSET mV
AC x (6 - 0.625)
Gain =
I
I
AC
2008/10/23 Rev. 2.1
Champion Microelectronic Corporation
Page 7
CHAMP [ CHAMPION MICROELECTRONIC CORP. ]
