CM6800
LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO
PIN DESCRIPTION
Operating Voltage
Description
Pin No.
Symbol
Min.
Typ.
Max.
Unit
1
IEAO
PFC transconductance current error amplifier output
0
4.25
V
2
3
IAC
PFC gain control reference input
0
-5
0
1
0.7
6
mA
V
ISENSE
VRMS
SS
Current sense input to the PFC current limit comparator
Input for PFC RMS line voltage compensation
Connection point for the PWM soft start capacitor
PWM voltage feedback input
4
V
5
0
8
V
6
0
8
V
VDC
7
Oscillator timing node; timing set by RT CT
1.2
0
3.9
6
V
RAMP 1
(RTCT)
When in current mode, this pin functions as the current sense
input; when in voltage mode, it is the PWM input from PFC
output (feed forward ramp).
8
RAMP 2
V
(PWM RAMP)
9
DC ILIMIT
PWM current limit comparator input
0
1
V
10
11
12
13
14
15
16
GND
Ground
PWM OUT
PFC OUT
VCC
PWM driver output
0
0
VCC
VCC
18
V
V
V
V
V
V
PFC driver output
Positive supply
10
15
7.5
2.5
VREF
Buffered output for the internal 7.5V reference
VFB
PFC transconductance voltage error amplifier input
PFC transconductance voltage error amplifier output
0
0
3
6
VEAO
2008/10/23 Rev. 2.1
Champion Microelectronic Corporation
Page 2
CHAMP [ CHAMPION MICROELECTRONIC CORP. ]
