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| HV845DB1 Datasheet, PDF (1/2 Pages) Supertex, Inc – Low Noise, Dual EL Lamp Driver | |||
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Low Noise, Dual EL Lamp Driver
HV845DB1
General Description
The Supertex HV845DB1 demo board contains all
necessary circuitry to demonstrate the features of the
HV845 dual 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).
Speciï¬cations
VDD input voltage:
VIN inductor supply voltage:
Supply Current:
Lamp Size:
Lamp Frequency:
Converter frequency:
Board Layout and Connection Diagram
Value
3.0V
3.3V - 4.2V
13mA
2.3in2
195Hz
98kHz
C1
VDD
C2
GND
VIN
Com1
EL1
EL2
Com2
Actual Size: 17.3mm x 14.4mm
Connections:
Controls C1 and C2: Lamp Selection
Various modes of the device are selected via the C1 and C2
pins. When C1 is connected to VDD/GND, Lamp 1 (EL1) will be
ON/OFF. When C2 is connected to VDD/GND, lamp 2 (EL2) will
be ON/OFF. When both C1 and C2 are connected to GND,
the device shuts down. These inputs may 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 HV845 EL driver IC. The supplied circuit is
optimized for 3.0V operation.
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.
EL1 and EL2: Lamp Connections
Connects to lamps 1 and 2. Polarity is irrelevant.
Com1 and Com2: Lamp Connections
Connects to the other side of lamps 1 and 2. Polarity is
irrelevant.
VIN: Inductor Supply
Supplies the high voltage power converter. The demoboard
is optimized for 3.3V to 4.2V operation.
1
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