ncp1651 ON Semiconductor, ncp1651 Datasheet - Page 6

• Manufacturer Part Number: ncp1651
• Description: Single Stage Power Factor Controller
• Manufacturer: ON Semiconductor

AC INPUT
AC COMP
AC REF
FB/SD
GND
10
11
8
9
2
CONVERTER
COMPENSATION
A
P
REFERENCE
CURRENT
MULTIPLIER
AVERAGE
6.5 V
25 k
V−I
+
−
3.8 k
4.5 V
20 mA
RAMP COMP
0.75 V
20 k
60 k
line
+
−
16
0.50 V
AC ERROR
+ k I
STARTUP
AMP
Figure 1. Block Diagram
TEMPERATURE
in
4
+
−
http://onsemi.com
= V
SENSOR
OVER−
ref
SHUTDOWN
NCP1651
COMPENSATION
AC REFERENCE
OSCILLATOR
16 k
13
V−I
6
RAMP
BUFFER
3
V
C
CC
T
4 V
REFERENCE
REGULATOR
R
−
+
8 COUNTER
PWM
UVLO
Q
DOMINANT
LEB
Clk
S
R
4 V
SET
I
AMPLIFIER
avg
CURRENT
SENSE
Q
7 6 I
avg−fltr
6.5 V
−
+
DRIVER
V
12
OUT
1
I
5
S+
ref