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).
Specifications
Input Voltage
Supply Current
Lamp Size Range
Lamp Frequency
Converter frequency
1.8V to 6.5V
45mA
5.5in
2
and 10in
2
250Hz
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
input may be connected to a mechanical switch, or to a logic
circuit output that has a source impedance of less than
20KΩ.
VIN
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
DD
IC Supply
Supplies the HV833 EL driver IC. The supplied circuit is
optimized for 1.8 to 6.5 volt operation.
V
A
and V
B
Lamp Connections
Connects to an EL lamp. Polarity is irrelevant.
Supertex, Inc.
•
1235 Bordeaux Drive, Sunnyvale, CA 94089
•
Tel: (408) 222-8888
•
FAX: (408) 222-4895
•
www.supertex.com
A071204
HV833DB1
HV833DB1 Schematic
HV833DB1 Schematic
Typical Performance
The specific external components used in the above circuit are: L
X
=220µH Murata (LQH43MN221K01), Cs= 10nF 100V NPO.
The following was observed when driving a 10in Green lamp.
2
V
IN
(V)
2.0
3.0
4.0
5.0
6.0
6.5
I
IN
(mA)
31.1
41.5
34.0
27.7
24.4
24.2
2
V
CS
(V)
49.7
67.8
77.2
81.5
84.3
85.3
f
EL
(Hz)
232
232
232
232
232
232
Brightness
ft-lm
1.4
3.4
4.3
4.5
4.7
4.8
cd/m
2
4.7
11.5
14.7
15.5
16.0
16.3
The following was observed when driving a 5.5in Green lamp
V
IN
(V)
1.8
2.0
3.0
4.0
5.0
6.0
6.5
A071204
I
IN
(mA)
26.1
29.1
25.2
18.5
14.7
13.5
12.0
V
CS
(V)
56.3
61.9
78.2
82.7
84.6
85.4
86.9
f
EL
(Hz)
232
232
232
232
232
232
232
Brightness
ft-lm
2.3
3.0
4.9
5.2
5.2
5.3
5.4
cd/m
2
7.9
10.3
16.8
17.8
17.5
18.1
18.5
2004
Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
1235 Bordeaux Drive, Sunnyvale, CA 94809
TEL: (408) 222-8888 / FAX: (408) 222-4895
www.supertex.com
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
