1
HV833DB1
05/02/02
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.
Introduction
The Supertex HV833DB1 demo board contains all necessary
circuitry to demonstrate the features of the HV833 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) and AN-H45 (EL lamp
driver circuits to reduce lamp audible noise).
Specifications
Input Voltage
1.8V to 6.5V
Supply Current
45mA
Lamp Size Range
5.5in
2
and 10in
2
Lamp Frequency
250Hz
Converter frequency
70KHz
Board Layout and Connections
EN Enable Input
Enables/Disables the lamp driver. A logic high (V
DD
) enables the
driver and a logic low (GND) disables the driver. This in put 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 HV833 EL driver IC. The supplied circuit is opti-
mized for 1.8 to 6.5 volt operations.
V
IN
Inductor Supply
Supplies the high voltage power converter.
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.
V
A
and V
B
Lamp Connections
Connects to an EL lamp. Polarity is irrelevant.
HV833DB1
EL Lamp Driver
HV833
L
X
C
S
Rsw
R
EL
C
DD
C
IN
DIODE
VDD
EN
VIN
GND
V
B
V
A
EL Lamp
ON
OFF
1.8 6.5V
2
HV833DB1
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 744-0100 FAX: (408) 222-4895
www.supertex.com
05/02/02rev.2
2002 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
Typical Performance
The specific external components used in the above circuit are: Lx=220mH Murata (LQH43MN221K01), Cs= 10nF 100V NPO.
The following was observed when driving a 10in
2
Green lamp.
V
N
I
)
V
(
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
0
.
2
1
.
1
3
7
.
9
4
2
3
2
4
.
1
7
.
4
0
.
3
5
.
1
4
8
.
7
6
2
3
2
4
.
3
5
.
1
1
0
.
4
0
.
4
3
2
.
7
7
2
3
2
3
.
4
7
.
4
1
0
.
5
7
.
7
2
5
.
1
8
2
3
2
5
.
4
5
.
5
1
0
.
6
4
.
4
2
3
.
4
8
2
3
2
7
.
4
0
.
6
1
5
.
6
2
.
4
2
3
.
5
8
2
3
2
8
.
4
3
.
6
1
The following was observed when driving a 5.5in
2
Green lamp.
V
N
I
)
V
(
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
8
.
1
1
.
6
2
3
.
6
5
2
3
2
3
.
2
9
.
7
0
.
2
1
.
9
2
9
.
1
6
2
3
2
0
.
3
3
.
0
1
0
.
3
2
.
5
2
2
.
8
7
2
3
2
9
.
4
8
.
6
1
0
.
4
5
.
8
1
7
.
2
8
2
3
2
2
.
5
8
.
7
1
0
.
5
7
.
4
1
6
.
4
8
2
3
2
2
.
5
5
.
7
1
0
.
6
5
.
3
1
4
.
5
8
2
3
2
3
.
5
1
.
8
1
5
.
6
0
.
2
1
9
.
6
8
2
3
2
4
.
5
5
.
8
1
1
2
3
4
8
7
6
5
V
DD
R
SW-osc
V
B
R
EL-osc
GND
V
A
L
X
C
S
HV833MG
EL Lamp
ON=V
DD
OFF=0V
Enable
4.7F
Lx
1N4148
Cs
100V
680K
2.0M
Inductor:
Murata LQH43MN221K01
0.1F
+
-
V
DD
+
-
V
IN
HV833DB1 Schematic
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