Microchip HV825DB1 Manual

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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

Lamp

connect t rogethe

GND

HV825 D B 1

RSW

1.5V

Enable

825

General Description Specications

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)