ml4841is Micro Electronics Corporation, ml4841is Datasheet - Page 6

• Manufacturer Part Number: ml4841is
• Description: Variable Feedforward Pfc/pwm Controller Combo
• Manufacturer: Micro Electronics Corporation

ML4841
TYPICAL PERFORMANCE CHARACTERISTICS
6
Voltage Error Amplifier (VEA) Transconductance (g
15
2
4
3
8
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
Variable Gain Control Transfer Characteristic
8V
400
300
200
100
Figure 1. PFC Section Block Diagram.
4
FROM PWM
OSCILLATOR
1
0
0
+
-
5
1
m
)
÷2
V RMS (mV)
2
Current Error Amplifier (IEA) Transconductance (g
3
2.7V
-1V
PFC I LIMIT
250
200
150
100
4
50
OVP
+
+
-
-
0
-500
V CCZ
5
V CCZ
IEA Input Voltage (mV)
13.5V
UVLO
S
R
S
R
0
Q
Q
Q
Q
REFERENCE
7.5V
13
V CC
PFC OUT
V REF
500
14
12
m
)