Microchip HV825DB1 Handleiding

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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 voltage1.5V

Supply current27mA (typical)

Lamp size range1.5in2

Lamp frequency450Hz (typical)

Converter frequency30KHz (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 VDDand VINare 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 trogethe

EN

V

DD

V

IN

GND

HV825DB1

V

A

V

B

R

EL

RSW

C

SW

C

DD

C

IN

L

C

S

D

1.5V

Enable

825

General DescriptionSpecications

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