Supertex inc.
EL Driver Demoboard
General Description
The HV830DB1 EL Driver demo board contains all the
circuitry necessary to drive an EL (Electroluminescent)
lamp. Simply connect it to a power supply and a lamp
as shown below.
Specifications
Supply Voltage
Supply current
Lamp Size Range
Lamp Frequency
Converter Frequency
HV830DB1
3.0V - 3.3V
70mA
3 - 12 in
2
~290Hz
~50kHz
Board Layout and Connection Diagram
Enable
Off
On
connect together
C
DD
R
SW
R
EL
C
SW
EN
V
A
L
C
IN
V
DD
V
IN
830
D
C
S
3.0 - 3.3V
GND
GN
V
B
EL Lamp
HV830DB1
HV830DB
Connections:
EN - Enable Input
Enables/disables the lamp driver. A logic high (V
DD
) enables
a driver, and a logic low (GND) disables the driver. This input
may be connected to a mechanical switch as shown, or to a
logic circuit output that has a source impedence of less than
20kΩ.
V
DD
- IC Supply
Supplies the HV830 EL driver IC. The supplied circuit is
optimized for 3.0V to 3.3V operation. Current draw is typically
100µA when enabled, and less than 1µA when disabled.
V
IN
- Supply
Supplies the high-voltage converter. Current draw is
approximately 70mA.
GND - Ground Circuit
Connect to V
DD
negative terminal. Supply bypass capacitors
for both V
DD
and V
IN
are provided on the demo board. An
external supply bypass capacitor is not necessary.
V
A
and V
B
- Lamp Connections
Connect to EL lamp of 3-12in
2
. Polarity is irrelevant.
Note:
The supplied circuit has been optimized to drive an 8in
2
lamp from a 3.0V to 3.3V supply. The circuit may be customized with different component
values to suit a particular application. For assitance in designing EL driver circuits, please refer to Application Notes AN-H33 (EL Lamp Driver Circuits) and
AN-H34 (HV823 & HV825 EL Lamp Driver Circuits).
041806
Supertex inc.
·
1235 Bordeaux Drive, Sunnyvale, CA 94089
·
Tel: (408) 222-8888
·
FAX: (408) 222-4895
·
www.supertex.com
1
HV830DB1
HV830DB1 Schematic
Enable
ON=V
DD
OFF=GND
R
EL-OSC
3MΩ
R
SW-OSC
1MΩ
HV830
V
DD
R
EL
V
A
R
SW
V
DD
Note 1
V
IN
C
DD
100nF
L
220µH
C
IN
4.7µF
D
BAS21
C
S
10nF
V
B
C
S
L
X
GND
C
SW
1nF
EL
Lamp
GND
Note
1: Tie V
DD
and V
IN
together if split suppies are not used.
C
DD
is not needed when a single supply is used.
Typical Performance
The circuit in Figure1 is optimized to drive a 8.0in
2
green lamp
from a 3.0V to 3.3V power supply. The specific components
used in Figure 1 are: Lx = 220µH Murata (LQH43CN221K01),
and C
S
= 3.3nF , 100V, Ceramic X7R.
V
DD
= V
IN
(V)
3.0
3.1
3.2
3.3
3.0
3.1
3.2
3.3
3.0
3.1
3.2
3.3
Notes:
1. Lamp brightness can vary by type and manufacturer.
2. The recommended inductor is a Murata LQH4N series. Other inductors may be used, however, different inductor characteristics (especially series
resistance) may result in overall circuit performance different from that listed. Please refer to Application Note AN-H33 for more information.
The following table is the performance observed with differ-
ent lamp size and lamp color. To better suit other applica-
tions, the circuit may be modified by changing one or more
of the components.
f
EL
(Hz)
Lamp Brightness
1
ft-lm
6.52
cd/m
2
22.3
22.5
22.6
22.7
23.1
23.4
23.6
23.9
11.8
13.0
13.6
14.2
I
IN
(mA)
27.4
26.3
25.8
25.3
42.8
41.7
39.7
39.8
60.3
63.5
65.8
67.7
Lamp Size
Lamp Color
3.5in
2
Green
6.58
6.61
6.64
6.75
5.0in
2
Green
287
6.84
6.90
6.99
3.45
10.0in
2
Pink
3.80
3.98
4.15
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
"product liability indemnification insurance agreement".
Supertex
does not assume responsibility for use of devices described and limits its liability to the replacement of the devices
determined 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.
©2006
Supertex inc.
All rights reserved. Unauthorized use or reproduction is prohibited.
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 222-8888 / FAX: (408) 222-4895
041806
www.supertex.com
2
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