SUPERTEX HV833DB1

HV833DB1
HV833DB1
EL Lamp Driver
Introduction
Specifications
The Supertex HV833DB1 demo board contains all necessary
circuitry to demonstrate the features of the HV833 EL lamp
driver.
Input Voltage
1.8V to 6.5V
Supply Current
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).
45mA
2
5.5in and 10in2
Lamp Size Range
Lamp Frequency
250Hz
Converter frequency
70KHz
Board Layout and Connections
VB
VDD
ON
Rsw
EN
HV833
REL
1.8 – 6.5V
DIODE
VA
OFF
CDD
VIN
GND
EL Lamp
CS
LX
CIN
EN Enable Input
GND Circuit Ground
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.
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
Connects to an EL lamp. Polarity is irrelevant.
Supplies the HV833 EL driver IC. The supplied circuit is optimized for 1.8 to 6.5 volt operations.
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.
1
HV833DB1
HV833DB1 Schematic
Enable
ON=VDD
OFF=0V
VDD
680KΩ
+
0.1F
-
2.0MΩ
1 VDD
VA 8
2 RSW-osc
VB 7
3 REL-osc
CS 6
4 GND
LX 5
HV833MG
VIN
+
EL Lamp
1N4148
Lx
Cs
100V
4.7F
-
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 10in2 Green lamp.
VIN(V)
IIN(mA)
VCS(V)
fEL(Hz)
2.0
31.1
49.7
3.0
41.5
4.0
Brightness
ft-lm
cd/ m2
232
1.4
4.7
67.8
232
3.4
11.5
34.0
77.2
232
4.3
14.7
5.0
27.7
81.5
232
4.5
15.5
6.0
24.4
84.3
232
4.7
16.0
6.5
24.2
85.3
232
4.8
16.3
The following was observed when driving a 5.5in2 Green lamp.
VIN(V)
IIN(mA)
VCS(V)
fEL(Hz)
1.8
26.1
56.3
2.0
29.1
3.0
Brightness
ft-lm
cd/ m2
232
2.3
7.9
61.9
232
3.0
10.3
25.2
78.2
232
4.9
16.8
4.0
18.5
82.7
232
5.2
17.8
5.0
14.7
84.6
232
5.2
17.5
6.0
13.5
85.4
232
5.3
18.1
6.5
12.0
86.9
232
5.4
18.5
05/02/02rev.2
©2002 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
2
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 744-0100 • FAX: (408) 222-4895
www.supertex.com