ml4812 Fairchild Semiconductor, ml4812 Datasheet - Page 7

• Manufacturer Part Number: ml4812
• Description: Power Factor Correction Pfc Controller
• Manufacturer: Fairchild Semiconductor

PRODUCT SPECIFICATION
Output Driver Stage
Error Amplifier
Gain Modulator
REV. 1.0.4 5/31/01
100
-20
80
60
40
20
Figure 5. Error Amplifier Open-Loop Gain and
0
10
4
3
Figure 4. Error Amplifier Configuration
EA–
EA OUT
100
5V
Phase vs Frequency
1k
FREQUENCY (Hz)
GAIN
+
–
10k
100k
0.5mA
1M
PHASE
8V
10M
0
-30
-60
-90
-120
-150
-180
Under Voltage Lockout
16
6
2
7
Figure 6. Gain Modulator Block Diagram
500
400
300
200
100
I SINE
GM OUT
RAMP COMP
C T
0
0
Figure 7. Gain Modulator Linearity
100
ERROR CURRENT
SINE INPUT CURRENT ( A)
I RAMP COMP
200
9V
I SINE
– I RAMP COMP /2
5V
300
ERROR CURRENT
400
500
4.5
4.0
3.5
3.0
2.5
2.0
1.5
ML4812
7