ML4800 Fairchild Semiconductor, ML4800 Datasheet - Page 8

• Manufacturer Part Number: ML4800
• Description: The ML4800 is a controller for power factor corrected, switched mode power supplies
• Manufacturer: Fairchild Semiconductor

ML4800
Current Error Amplier
8
15
2
4
3
7
I AC
V FB
V RMS
I SENSE
RAMP 1
2.5V
–
+
VEA
VEAO
MODULATOR
GAIN
16
1.6k
1.6k
+
–
IEA
IEAO
Figure 1. PFC Section Block Diagram
1
OSCILLATOR
+
–
0.5V
+
–
TRI-FAULT
Cycle-By-Cycle Current Limiter
TriFault Detect
Overvoltage Protection
2.75V
–1V
PFC I LIMIT
OVP
+
–
+
–
TM
S
R
S
R
PRODUCT SPECIFICATION
Q
Q
Q
Q
REV. 1.0.5 9/25/01
PFC OUT
12