Functional Block Diagram
V
DD
Lx
HV841
C
1
C
2
R
SW-OSC
C
S
Control Logic
& Switch-Osc
V
SENSE
Output
Drivers
Vcs
EL
1
+
Vcs
GND
Disable
Logic Control &
Divide by 128
Figure 1: Test Circuit
V
EN
= ON
V
EN
= ON 0 = OFF
0 = OFF
EL Lamp 1 (1.9 in
2
)
3
1
2
C
1
V
DD
+
V
DD
-
470 kΩ
0.1µF
3
4
5
R
SW-OSC
Com
C
2
GND
C
S
L
X
V
IN
+
HV841MG-G/
HV841K6-G
4.7µF
-
1 or any (equivalent or better)
>
120V, fast recovery diode
2 Murata LQH4CN331K04
3 The bigger sized lamp should be tied to EL1 and the smaller
sized lamp to EL2 terminals (pins 10 and 9 respectively)
-
V
REF
EL
1
EL
2
10
9
8
7
6
EL
2
COM
EL Lamp 2 (1.6 in
2
)
3
BAS21
1
~
330µH
2
3.3 nF, 200V
4
NR033106
SUPERTEX [ Supertex, Inc ]
