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).
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
V
B
VDD
ON
1.8 鈥?6.5V
OFF
VIN
GND
C
IN
C
DD
EN
R
EL
Rsw
C
S
HV833
DIODE
EL Lamp
V
A
L
X
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鈩?
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 opti-
mized for 1.8 to 6.5 volt operations.
V
A
and V
B
Lamp Connections
Connects to an EL lamp. Polarity is irrelevant.
V
IN
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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