Microchip HV825DB1 Manual


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Side 1/2
Supertex inc.
Supertex inc.
www.supertex.com
HV825DB1
Doc.# DSDB-HV825DB1
B032114
The HV825DB1 EL Driver demoboard contains all the circuitry
necessary to drive an EL (Electroluminescent) lamp. Simply
connect it to a power supply and a lamp as shown below.
The supplied circuit has been optimized to drive a 1.5in2
lamp from a 1.5V supply. The circuit may be customized with
different component values to suit a particular application. For
additional assitance in designing EL driver circuits, please refer
to Application Notes AN-H33 (EL Lamp Driver Circuits)
and .AN-H34 (HV823 & HV825 EL Lamp Driver Circuits)
Board Layout and Connection Diagram
EL Driver
Demoboard
Parameter Value
Supply voltage 1.5V
Supply current 27mA (typical)
Lamp size range 1.5in2
Lamp frequency 450Hz (typical)
Converter frequency 30KHz (typical)
Connections:
EN - Enable Input
Enables/disables the lamp driver. A logic high (VDD) enables
the driver and a logic low (GND) disables the driver. This
input may be connected to a mechanical switch as shown,
or to a logic circuit output that has a source impedance of
less than 20kΩ.
VDD - IC Supply
Supplies the HV825 EL driver IC. The supplied circuit is op-
timized for 1.5V operation. Current draw is less than 1.0µA
when disabled.
VIN
- Inductor Supply
Supplies the high voltage power converter. Current draw is
approximately 27mA.
GND - Circuit Ground
Connect to 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 neces-
sary.
VA and VB - Lamp Connections
Connect to EL lamp of 1.5in2. Polarity is irrelevant.
Off
On
EL
Lamp
connect t rogethe
EN
V
DD
V
IN
GND
HV825 D B 1
V
A
V
B
R
EL
RSW
C
SW
C
DD
C
IN
L
C
S
D
1.5V
Enable
825
General Description Specications


Produkt Specifikationer

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Model: HV825DB1

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