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HV833DB1
HV833DB1
EL Lamp Driver
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).
Board Layout and Connections
V
DD
ON
1.8 – 6.5V
OFF
EN
V
IN
GND
R
EL
Specifications
Input Voltage 1.8V to 6.5V
Supply Current 45mA
Lamp Size Range 5.5in2 and 10in
Lamp Frequency 250Hz
Converter frequency 70KHz
V
B
R
sw
C
HV833
C
DD
IN
DIODE
L
C
S
V
A
X
EL Lamp
2
EN Enable Input
Enables/Disables the lamp driver. A logic high (VDD) 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 20KΩ.
GND Circuit Ground
Connect to VDD and VIN negative terminals. Supply bypass
capacitor for both VDD and VIN are provided on the demo board.
External supply bypass capacitors are not necessary.
VA and VB Lamp Connections
VDD IC Supply
Supplies the HV833 EL driver IC. The supplied circuit is optimized for 1.8 to 6.5 volt operations.
Connects to an EL lamp. Polarity is irrelevant.
VIN Inductor Supply
Supplies the high voltage power converter.
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.
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ON=V
DD
OFF=0V
HV833DB1
HV833DB1 Schematic
Enable
1
V
2
3
4
DD
R
SW-osc
R
EL-osc
GND
HV833MG
+
V
DD
-
0.1F
680KΩ
2.0MΩ
+
V
IN
4.7F
8
V
A
V
7
B
C
6
S
L
5
X
1N4148
Lx
EL Lamp
Cs
100V
-
Inductor: Murata LQH43MN221K01
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
VNI)V(INI)Am(VSC)V(fLE)zH(
0.21.137.942324.17.4
0.35.148.762324.35.11
0.40.432.772323.47.41
0.57.725.182325.45.51
0.64.423.482327.40.61
5.62.423.582328.43.61
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Green lamp.
ml-tfm/dc
ssenthgirB
2
The following was observed when driving a 5.5in2 Green lamp.
ssenthgirB
VNI)V(INI)Am(VSC)V(fLE)zH(
ml-tfm/dc
8.11.623.652323.29.7
0.21.929.162320.33.01
0.32.522.872329.48.61
0.45.817.282322.58.71
0.57.416.482322.55.71
0.65.314.582323.51.81
5.60.219.682324.55.81
©2002 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
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05/02/02rev.2
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 744-0100 • FAX: (408) 222-4895
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www.supertex.com
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