Microchip HV823DB1 Handleiding

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Supertex inc.

Supertex inc.

www.supertex.com

HV823DB1

Doc.# DSDB-HV823DB1

B032114

The HV823DB1 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 an 8.0in2 lamp

from a 3.0 to 3.3V supply. The circuit may be customized with

different component values to suit a particular application.

To assist in customization, various circuits optimized for a

variety of applications are provided. For additional assitance

in designing EL driver circuits, please refer to AN-H34 (HV823

& HV825 EL Lamp Driver Circuits).

Board Layout and Connections

EL Driver

Demoboard

Parameter Value

Supply voltage3.0 to 3.3V

Supply current~50mA

Lamp size range3.0 to 12in2

Lamp frequency~260Hz

Converter frequency~50KHz

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 HV823 EL driver IC. The supplied circuit is op-

timized for 3.0V to 3.3V operation. Current draw is typically

100µA when enabled and less than 1µA when disabled.

VIN

- Inductor Supply

Supplies the high voltage power converter. Current draw is

approximately 50mA.

GND - Circuit Ground

Connect to VDD negative terminal. Supply bypass capacitors

for both VDD and VIN are provided on the demoboard. An ex-

ternal supply bypass capacitor is not necessary.

VA and VB

- Lamp Connections

Connect to EL lamp of 3 to 12 square inches. Polarity is ir-

relevant.

Off

On

EL Lamp

connect together

EN

VDD

VIN

GND

HV823DB1

V

A

VB

R

EL

R

SW

C

SW

C

DD

C

L

C

D

823

3.0 - 3.3V

Enable

General DescriptionSpecications

Product specificaties