1
HV832DB1
12/14/01
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability
indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to
workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the
Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.
HV832DB1
Dual EL Lamp Driver
Introduction
The Supertex HV832DB1 demo board contains all necessary
circuitry to demonstrate the features of the HV832 dual EL lamp
driver.
Simply connect it to a power supply and a lamp as shown below.
For additional assistance in designing EL driver circuits, please
refer to application notes AN-H33 (effect of external components
on performance of Supertex EL drivers), application note AN-
H44 (HV832 application circuits), and AN-H43 (EL lamp driver
circuits to reduce lamp audible noise).
Specifications
Input Voltage
3.0V to 4.2V
Supply Current
40mA Max.
Lamp Size Range
Up to 2.7in
2
Lamp Frequency
417Hz
Converter Frequency
53.4KHz
Demo Board Connections:
Control
lamp selection/Enable Input (EN-SW)
Various modes of the device are selected via the control pin/EN-
SW. Each logic pulse applied to the control pin/EN-SW will
cause the device to change to the next mode. The sequence for
the modes is: 1) EL1 on, 2) EL2 on, 3) both EL1 and EL2 on, and
4) device shuts down. This input may be connected to a
mechanical switch, or to a logic circuit output that has a source
impedance of less than 20K
.
V
DD
IC Supply
Supplies the HV832 EL driver IC. The supplied circuit is
optimized for 3.0 to 4.2 volt operations. Connect to positive
terminal of a power supply.
V
IN
Inductor Supply
Supplies the high voltage power converter. Connect to positive
terminal of a power supply.
GND
Circuit Ground
Connect to V
DD
and V
IN
negative terminals. Supply bypass
capacitor for both V
DD
and V
IN
are provided on the demo board.
External supply bypass capacitors are not necessary.
EL1 and EL2
Lamp Connections
Connects to lamps 1 and 2. Polarity is irrelevant.
Com
Lamp Connections
Connects to the other side of lamps 1 and 2. Polarity is irrelevant.
Board Layout and Connections
GND
HV832
EN-SW
Com
Com
Re
EL1
EL2
V
IN
V
DD
C
DD
Ce
Diode
Cs
C
IN
LX
2
HV832DB1
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 744-0100 FAX: (408) 222-4895
www.supertex.com
12/13/01rev.4
2001 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
Typical Performance
The specific external components used in the above circuit are L
X
=390
H Murata (LQH32CN391K21), Cs= 3.3nF 100V NPO.
The following was observed when driving a 0.93in
2
Green lamp.
The following was observed when driving EL1=1.3in
2
and EL2=0.93in
2
Green lamps.
The above circuit may need to be optimized further based on specification of the lamp used.
V
D
D
)
V
(
V
N
I
)
V
(
p
m
a
L
n
o
i
t
c
e
l
e
S
I
N
I
)
A
m
(
V
S
C
)
V
(
f
L
E
)
z
H
(
s
s
e
n
t
h
g
i
r
B
m
l
-
t
f
m
/
d
c
2
3
.
3
3
.
3
2
r
o
1
p
m
a
L
9
.
0
2
7
.
0
8
7
1
4
5
7
.
1
1
2
.
0
4
s
p
m
a
l
h
t
o
B
1
.
1
3
0
.
3
7
4
6
.
0
1
4
.
6
3
0
.
3
0
.
3
2
r
o
1
p
m
a
L
9
.
1
2
4
.
8
7
4
3
.
1
1
8
.
8
3
s
p
m
a
l
h
t
o
B
0
.
2
3
1
.
0
7
2
8
.
9
6
.
3
3
2
.
3
2
r
o
1
p
m
a
L
3
.
1
2
8
.
9
7
4
6
.
1
1
8
.
9
3
s
p
m
a
l
h
t
o
B
4
.
1
3
3
.
2
7
9
2
.
0
1
2
.
5
3
2
.
4
2
r
o
1
p
m
a
L
3
.
9
1
2
.
5
8
3
4
.
2
1
5
.
2
4
s
p
m
a
l
h
t
o
B
3
.
8
2
0
.
1
8
8
5
.
1
1
6
.
9
3
V
D
D
)
V
(
V
N
I
)
V
(
p
m
a
L
n
o
i
t
c
e
l
e
S
I
N
I
)
A
m
(
V
S
C
)
V
(
f
L
E
)
z
H
(
s
s
e
n
t
h
g
i
r
B
m
l
-
t
f
m
/
d
c
2
3
.
3
3
.
3
1
L
E
8
.
3
2
3
.
1
8
7
1
4
9
7
.
0
1
9
.
6
3
2
L
E
9
.
0
2
7
.
0
8
5
7
.
1
1
2
.
0
4
s
p
m
a
l
h
t
o
B
2
.
4
3
7
.
1
7
9
5
.
9
8
.
2
3
1
2
3
4
8
7
6
5
V
DD
Com
Control
GND
EL2
L
X
C
S
HV832MG
EL Lamp 2
4.7
F
390
H
1N914*
3.3nF
100V
0.1
F
+
-
V
DD
+
-
V
IN
HV832DB1 Schematic
EL1
EL Lamp 1
EN-SW
Re**
Ce**
10nF
10K
* Any (equivalent or better)> 90V, fast reverse recovery diode
** Re and Ce are used to prevent change in lamp selection due to use of
mechanical switch which can have contact bounce.
Lx = 390
H MuRata (LQH32CN391K21)
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