Microchip HV859DB1 Manual

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Supertex inc.

www.supertex.com

HV859DB1

Doc.# DSDB-HV859DB1

A032813

General Description

The Supertex HV859DB1 demoboard contains all the

necessary circuitry needed to demonstrate the features of

the HV859 EL lamp driver.

Simply connect it to a power supply and an EL lamp. For

additional assistance in designing EL driver circuits, please

refer to application notes AN-H33 (the effect of external

components on performance of Supertex EL drivers)

and AN-H43 (EL lamp driver circuits to reduce audible

lamp noise).

Board Layout and Connection Diagram

EL Lamp Driver

Demoboard

Connections:

GND

HV859

EN - Enable Input

Enables/Disables the lamp driver. A logic high (connect

to VDD) enables the driver, and a logic low (connect to

GND), disables the driver. This input can 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 HV859 EL driver IC. The supplied circuit is

optimized for 3.0V operation. The operating range can be

from 1.8V to 5.0V. Connect to the positive terminal of a

power supply.

VIN - Inductor Supply

Supplies the high voltage power converter. Connect to the

positive terminal of a power supply.

GND - Circuit Ground

Connect to the 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

required.

VA and VB - Lamp Connections

Connect to an EL lamp. Polarity is irrelevant.

Note:

Make sure all the above connections are made before powering up the supply voltages.

Actual Dimensions = 12mm x 12mm

Parameter Value

Input voltage: 1.8 to 5.0V

Typical supply current: 25mA

Lamp size range: up to 5.0in2

Lamp frequency: 204Hz

Converter frequency: 80kHz

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.” does not assume responsibility for use of devices described, and limits its liabilit Supertex inc. y

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 (website: http//wwwSupertex inc. .supertex.com)