
AN349
4 AN349REV1
Figure 5. Ballast Startup with CS1601
4. Theory of Operation
Figure 4 and Figure 5 are the internal block diagrams of the L6562 and the CS1601, respectively.
Figure 6. L6562 Block Diagram
4
CS
7
GD
2
COMP
VCC
GND
V
CC
8
V
Ref2
Starter
Stop
R1
+
-
+
-
Voltage
Regulator
Overvoltage
Detection
R2
40k
Multiplier & THD
Optimizer
Disable
Driver
25V
+
-
R
S
Q
+
-
5
ZCD
INV
1
UVLO
6
Starter
2.1V
1.6V
Zero Current
Detector
15V
5pF
MULT
3
Internal
Supply 7V
2.5V
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