ml4841 Fairchild Semiconductor, ml4841 Datasheet - Page 6

• Manufacturer Part Number: ml4841
• Description: Ml4841 Variable Feedforward Pfc/pwm Controller Combo
• Manufacturer: Fairchild Semiconductor

ML4841
Typical Performance Characteristics
6
15
Voltage Error Amplifier (VEA) Transconductance (g
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
16
2
V FB (V)
3.5kΩ
3.5kΩ
3
+
-
IEA
IEAO
8V
Variable Gain Control Transfer Characteristic
400
300
200
100
4
0
Figure 1. PFC Section Block Diagram.
0
1
OSCILLATOR
+
-
5
1
m
)
V RMS (mV)
2
÷2
3
Current Error Amplifier (IEA) Transconductance (g
2.7V
-1V
250
200
150
100
4
50
PFC I LIMIT
0
-500
OVP
+
+
-
-
5
V CCZ
IEA Input Voltage (mV)
V CCZ
13.5V
UVLO
0
R
R
S
S
PRODUCT SPECIFICATION
REFERENCE
Q
Q
Q
Q
REV. 1.0.3 6/13/01
7.5V
13
V CC
PFC OUT
500
V REF
m
14
12
)