ML4826 Fairchild, ML4826 Datasheet - Page 6

• Manufacturer Part Number: ML4826
• Description: PFC and Dual Output PWM Controller Combo
• Manufacturer: Fairchild

ML4826
Typical Performance Characteristics
6
Voltage Error Amplifier (VEA) Transconductance (g
19
2
4
3
8
7
I AC
V FB
V RMS
I SENSE
RAMP 1
R T C T
2.5V
250
200
150
100
50
0
0
+
-
VEA
VEAO
MODULATOR
1
GAIN
20
2
3.5kΩ
V FB (V)
3.5kΩ
+
-
3
IEA
Variable Gain Control Transfer Characteristic
IEAO
8V
400
300
200
100
4
Figure 1. PFC Section Block Diagram.
0
1
OSCILLATOR
0
+
-
5
1
m
)
V RMS (mV)
2
x2
3
Current Error Amplifier (IEA) Transconductance (g
2.7V
-1V
PFC I LIMIT
4
250
200
150
100
50
OVP
+
+
0
-500
-
-
5
V CCZ
V CCZ
IEA Input Voltage (mV)
13.5V
UVLO
R
R
PRODUCT SPECIFICATION
S
S
0
Q
Q
Q
Q
REFERENCE
REV. 1.0.5 2/14/02
7.5V
17
V CC
PFC OUT
V REF
500
18
15
m
)