HV859DB1 User Guide

Supertex inc.
HV859DB1
EL Lamp Driver
Demoboard
General Description
The Supertex HV859DB1 demoboard contains all the
necessary circuitry needed to demonstrate the features of
the HV859 EL lamp driver.
Simply connect it to a power supply and an EL lamp. For
additional assistance in designing EL driver circuits, please
refer to application notes AN-H33 (the effect of external
components on performance of Supertex EL drivers)
and AN-H43 (EL lamp driver circuits to reduce audible
lamp noise).
Specifications
Parameter
Value
Input voltage:
1.8 to 5.0V
Typical supply current:
25mA
Lamp size range:
up to 5.0in2
Lamp frequency:
204Hz
Converter frequency:
80kHz
Board Layout and Connection Diagram
VDD
CDD
RSW
HV859
REL
EN
VA
VB
CIN
CS
GND
VIN
LX
D
Actual Dimensions = 12mm x 12mm
Connections:
EN - Enable Input
Enables/Disables the lamp driver. A logic high (connect
to VDD) enables the driver, and a logic low (connect to
GND), disables the driver. This input can be connected to
a mechanical switch, or to a logic circuit output that has a
source impedance of less than 20kΩ.
VDD - IC Supply
Supplies the HV859 EL driver IC. The supplied circuit is
optimized for 3.0V operation. The operating range can be
from 1.8V to 5.0V. Connect to the positive terminal of a
power supply.
VIN - Inductor Supply
Supplies the high voltage power converter. Connect to the
positive terminal of a power supply.
GND - Circuit Ground
Connect to the VDD and VIN negative terminals. Supply
bypass capacitors for both VDD and VIN are provided on
the demo board. External supply bypass capacitors are not
required.
VA and VB - Lamp Connections
Connect to an EL lamp. Polarity is irrelevant.
Note:
Make sure all the above connections are made before powering up the supply voltages.
Doc.# DSDB-HV859DB1
A032813
Supertex inc.
www.supertex.com
HV859DB1
Circuit Schematic
ON = VDD
OFF = 0V
Enable Signal
1
RSW = 560kΩ
CDD
0.1µF
+
VDD
2
3
-
REL = 2.0MΩ
4
VDD
VA
RSW-Osc
VB
REL-Osc
CS
GND
LX
CIN
4.7µF
7
EL Lamp
6
BAS21
5
CS
3.3nF
100V
LX
220µH*
HV859
+
VIN
-
8
Notes:
Tie VDD and VIN together if split supplies are not used.
* Murata Inductor LQH32CN221K21
The above circuit may be optimized further based on specification of the lamp used.
Typical Performance
The specific external components used in the above circuit are Lx = 220µH Murata (LQH32CN221K21), CS = 3.3nF 200V NPO.
Lamp Size
(in )
2
VDD = VIN
(V)
IIN
VCS
Brightness
fEL
(mA)
(VPEAK)
(Hz)
ft-lm
cd/m2
3.0
1.8
25.4
102
204
3.74
12.8
3.0
2.0
25.5
104
204
4.70
16.1
3.0
3.0
26.1
106
204
7.57
25.9
3.0
4.0
20.6
109
204
8.45
28.9
3.0
5.0
17.0
112
204
8.87
30.3
Bill of Materials
Component
Description
Package
Manufacturer
Part #
LX
220µH inductor
---
Murata
LQH32CN221K21
CS
3.3nF, 200V, NPO chip capacitor
1206
Tecate Industries
CMC-200/332JN1206T
RSW
1%, 562kΩ resistor
0603
Any
---
REL
1%, 2MΩ resistor
0603
Any
---
CIN
4.7µF, 10V ceramic chip capacitor
0805
Any
---
CDD
0.1µF, 16V ceramic chip capacitor
0603
Any
---
Diode
250V fast recovery diode
SOT-23
Diodes Inc
BAS21
U1
EL driver IC
8-Lead MSOP
Supertex Inc
HV859MG
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-HV859DB1
A032813
2
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com