ml4827cs-2 Fairchild Semiconductor, ml4827cs-2 Datasheet - Page 6

• Manufacturer Part Number: ml4827cs-2
• Description: Fault-protected Pfc And Pwm Controller Combo
• Manufacturer: Fairchild Semiconductor

ML4827
Typical Performance
6
15
2
4
3
7
I AC
V FB
V RMS
I SENSE
RAMP 1
2.5V
Voltage Error Amplifier (VEA) Transconductance (g
250
200
150
100
50
0
0
–
+
VEA
VEAO
MODULATOR
1
GAIN
16
2
3.5kΩ
V FB (V)
3.5kΩ
+
–
3
IEA
IEAO
400
300
200
100
1
4
0
Figure 1. PFC Section Block Diagram
0
OSCILLATOR
Gain Modulator Transfer Characteristic (K)
+
–
POWER FACTOR CORRECTOR
5
1V
1
m
)
+
–
V RMS (mV)
2
BROKEN WIRE
COMPARATOR
3
2.7V
–1V
Current Error Amplifier (IEA) Transconductance (g
250
200
150
100
50
–500
0
4
PFC I LIMIT
+
+
–
–
OVP
5
IEA INPUT VOLTAGE (mV)
2µA
V REF
0
V CCZ
13.5V
S
R
S
R
PRODUCT SPECIFICATION
Q
Q
Q
Q
V CC
REFERENCE
REV. 1.0.1 6/27/01
13
7.5V
PFC OUT
500
V REF
m
)
14
12