NCP1608
V in
L
N B :N ZCD
D
V out
AC Line
EMI
Filter
R ZCD
+
C in
R out1
1
2
NCP1608
FB V CC
Control DRV
8
7
V C C
M
+
LOAD
(Ballast,
SMPS, etc.)
C bulk
R out2
C COMP
C t
3
4
Ct
CS
GND
ZCD
6
5
R sense
Figure 1. Typical Application
C bulk
D
V out
R out1
FB
R out2
R FB
+ OVP
+ ?
V OVP
? UVP
+ +
V UVP
E/A ?
+
g m
+
V REF
POK
(Enable EA)
+
-
+
Fault
V CC
UVLO
V DD Reg
V DD
V DDGD
m V DD
V CC
Haversine
V in L
Control
V Control
N B :N ZCD
C COMP
C t
I charge
V DD
V EAH
Clamp
Add Ct
Offset
PWM
?
+
POK
+
+
+
M
R sense
R ZCD
C t
CS
ZCD
LEB + OCP
?
V ILIM
+
?
V ZCD(ARM)
+
?
V ZCD(TRIG)
ZCD Clamp
DRV
S Q
R Q
Reset
Off Timer
m V DD
Demag
S Q
R Q
S Q
R Q
S Q
S Q
R Q
UVLO
V DDGD
m V DD
V CC
DRV
GND
R Q
All SR Latches are Reset Dominant
Figure 2. Block Diagram
http://onsemi.com
2
POK
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