ML4824 Fairchild, ML4824 Datasheet - Page 6

• Manufacturer Part Number: ML4824
• Description: Power Factor Correction and PWM Controller Combo
• Manufacturer: Fairchild

ML4824
TYPICAL PERFORMANCE CHARACTERISTICS
6
Voltage Error Amplifier (VEA) Transconductance (g
15
2
4
3
7
I AC
V FB
V RMS
I SENSE
RAMP 1
2.5V
250
200
150
100
50
0
0
–
+
VEA
VEAO
MODULATOR
1
GAIN
16
2
3.5k
V FB (V)
3.5k
+
–
3
IEA
IEAO
Gain Modulator Transfer Characteristic (K)
400
300
200
100
Figure 1. PFC Section Block Diagram.
4
0
1
OSCILLATOR
0
+
–
5
1
m
)
V RMS (mV)
2
Current Error Amplifier (IEA) Transconductance (g
3
2.7V
–1V
250
200
150
100
PFC I LIMIT
4
50
–500
0
+
+
OVP
–
–
5
IEA INPUT VOLTAGE (mV)
0
R
R
S
S
Q
Q
Q
Q
REV. 1.01 12/7/2000
PFC OUT
500
12
m
)