Supertex inc.
Dimmable, Low Noise, Dual EL Lamp
Driver Demoboard
General Description
The Supertex HV861DB1 demoboard contains all the
necessary circuitry to demonstrate the features of the HV861
dual EL Lamp driver.
Simply connect it to a power supply and a lamp as shown in
Figure 1.
A 2.2µF capacitor is connected between VREF and GND. It
allows the lamp to slowly (in about 400ms) brighten up/dim
down during power up/power down. The dimming feature is
common to both lamps.
HV861DB1
Specifications
Parameter
VDD input voltage:
VIN inductor supply voltage:
Typical supply current:
Lamp size:
Lamp frequency:
Converter frequency:
Value
2.5V to 4.5V
3.2V to 4.2V
28mA
4.5in
2
188Hz
98kHz
Board Layout
VDD
EN1
EN2
GND
VIN
EL1
COM1
COM2
EL2
Actual Dimensions: 26mm x 24mm
Connections:
EN1 and EN2: Lamp Selection
CMOS logic inputs which enable/disable the lamp drivers.
When EN1 is connected to VDD/GND, Lamp 1 (EL1) will
be ON/OFF. When EN2 is connected to VDD/GND, Lamp 2
(EL2) will be ON/OFF.
GND: Circuit Ground
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.
VDD: IC Supply
EL1 and EL2: Lamp Connections
Connects to Lamps 1 and 2.
Supplies the HV861 EL driver IC. The supplied circuit is op-
timized for 3.0V operation.
COM1 and COM2: Lamp Connections
Connects to the other side of Lamps 1 and 2.
VIN: Inductor Supply
Supplies the high voltage power converter. The demoboard
is optimized for 3.2V to 4.2V operation
Notes:
All of the above connections must be made before powering up the supply voltages.
The V
REG
pin should not be touched after power-up.
Doc.# DSDB-HV861DB1
A032813
Supertex inc.
www.supertex.com
HV861DB1
Bill of Materials
Component
L
X
D1
C
IN
C
S
C
DD
C
REF
R
EL
R
SW
R
REG
R
PWM
U1
Description
100µH shielded inductor
200V fast recovery diode
4.7µF, 10V ceramic chip capacitor
3.3nF, 100V, NPO chip capacitor
0.1µF, 16V ceramic chip capacitor
2.2uF, 16V ceramic chip capacitor
1% 2MΩ chip resistor
1% 825kΩ chip resistor
1% 3.3MΩ chip resistor
0Ω chip resistor
EL driver IC
Package
---
SOD-323
0805
0805
0805
0805
0805
0805
0805
0805
16-Lead QFN
Manufacturer
Coilcraft
Diodes Inc.
Any
NOVA CAP
Any
Any
Any
Any
Any
Any
Supertex
Part Number
LPS4012-104MLB
BAS20HT1
---
0805N332K101NT
---
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---
---
---
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HV861K7-G
Note:
The above circuit may 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)
©2013
Supertex inc.
All rights reserved. Unauthorized use or reproduction is prohibited.
Doc.# DSDB-HV861DB1
A032813
3
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com
Supertex inc.
工业自动化与控制
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