ML4826
TYPICAL PERFORMANCE CHARACTERISTICS
250
250
200
150
100
50
200
150
100
50
0
0
-500
0
1
2
3
4
5
0
500
V
(V)
IEA Input Voltage (mV)
FB
Voltage Error Amplifier (VEA) Transconductance (g )
Current Error Amplifier (IEA) Transconductance (g )
m
m
400
300
200
100
0
0
1
2
3
4
5
V
(mV)
RMS
Variable Gain Control Transfer Characteristic
20
1
17
V
IEAO
VEAO
VEA
CC
V
CCZ
OVP
V
V
REF
FB
13.5V
7.5V
+
IEA
18
15
3.5kΩ
19
-
REFERENCE
-
2.7V
-1V
-
+
-
2.5V
AC
+
+
S
Q
I
2
4
3
8
7
+
-
8V
GAIN
MODULATOR
V
I
R
S
Q
Q
RMS
PFC OUT
3.5kΩ
PFC I
LIMIT
SENSE
RAMP 1
R
Q
R C
T T
OSCILLATOR
x2
V
UVLO
CCZ
Figure 1. PFC Section Block Diagram.
6