HV852DB1 User Guide

Supertex inc.
HV852DB1
High Voltage, Low Noise,
Inductorless EL Lamp Driver Demoboard
General Description
Specifications
The Supertex HV852DB1 demoboard contains all necessary
circuitry to demonstrate the features of the HV852 EL lamp
driver.
Parameter
Value
VDD input voltage:
Simply connect it to a power supply and a lamp, as shown
below. For additional assistance in implementation of the
HV852 circuit, please refer to the HV852 data sheet.
2.4 to 5.0V
Supply current:
25mA
Lamp size:
1.5in2
Lamp frequency:
245Hz
Board Layout and Connection Diagram
VDD
REL
CDD
VB
EN
HV852
CLKIN
GND
VA
HV852DB1
CLKEN
Actual Dimensions: 13mm x 8.0mm
Connections:
EN - Enable Input
CLKEN - Clock Enable
Enables/Disables the lamp driver. Logic high (VDD), 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.
To use external clock for setting the EL lamp frequency, this
pin will need to be connected to VDD. To set the lamp frequency
via REL, this pin will need to be connected to GND.
VDD - IC Supply
An external logic clock applied to this pin can be used to set
the EL lamp frequency. When using external clock signal,
REL will need to be removed, and REL pin will need to be
connected to GND. CLKEN will need to be connected to VDD
when an external clock signal is used. Connect both CLKEN
and CLKIN to GND when not in use.
Supplies the HV852 EL driver IC. The supplied circuit is
optimized for 2.4 to 5.0V operation.
VA and VB - Lamp Connections
Connects to an EL lamp. Polarity is irrelevant.
CLKIN - Logic Input
GND - Circuit Ground
Connect to VDD negative terminals. Supply bypass capacitor
for VDD is provided on the demo board. External supply
bypass capacitors are not necessary.
Doc.# DSDB-HV852DB1
A032813
Supertex inc.
www.supertex.com
HV852DB1
Circuit Schematic
+
VDD
REL
CDD
1
2
3
-
4
VDD = ON
GND = OFF
5
VDD
VA
REL
VB
EN
GND
CLKIN
GND
VDD
CLKEN
10
EL
Lamp
9
8
7
6
HV852
Typical Performance
The specific external components used in the above circuit are: CDD = 2.2µF, 6.3V ceramic capacitor and REL = 1.5MΩ.
The following was observed when driving a 0.93in2 green lamp and 1.5in2 green lamp.
Lamp Size
(V)
(mA)
VPEAK
(V)
(Hz)
(ft-lm)
(cd/m2)
0.93
2.4
15.6
79
245
4.30
14.7
0.93
3.0
14.9
79
245
5.10
17.4
0.93
3.6
14.7
79
245
5.32
18.2
0.93
4.2
15.1
79
245
5.50
18.8
0.93
5.0
15.7
79
245
5.61
19.2
1.50
2.4
19.0
66
245
2.81
9.60
1.50
3.0
23.4
79
245
4.77
16.3
1.50
3.6
23.5
79
245
5.26
18.0
1.50
4.2
23.7
79
245
5.53
18.9
1.50
5.0
24.1
79
245
5.73
19.6
(in )
VDD
Lamp Brightness
IDD
2
fEL
Bill of Materials
Part
Description
Package
Manufacturer
Part Number
REL
1%, 1.5MΩ resistor
0603
Any
---
CDD
2.2µF, 6.3V, ceramic chip capacitor
0603
Any
---
U1
EL driver IC
10-Lead DFN
Supertex Inc
HV852K7-G
The above circuit may need to be optimized further based on specification of the lamp used.
Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives
an adequate “product liability indemnification insurance agreement.” Supertex inc. 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 and inaccuracies. Circuitry and
specifications are subject to change without notice. For the latest product specifications refer to the Supertex inc. (website: http//www.supertex.com)
Supertex inc.
©2013 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited.
Doc.# DSDB-HV852DB1
A032813
2
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com