Microchip HV833DB1 Handleiding

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Supertex inc.

www.supertex.com

HV833DB1

Doc.# DSDB-HV833DB1

B032114

The Supertex HV833DB1 demoboard contains all necessary

circuitry to demonstrate the features of the HV833 EL lamp driver.

Simply connect it to a power supply and a lamp as shown below.

For additional assistance in designing EL driver circuits, please

refer to Application Notes AN-H33 (Effect of External Components

on Performance of Supertex EL Drivers) and AN-H45 (EL Lamp

Driver Circuits to Reduce Lamp Audible Noise).

Board Layout and Connections

High Voltage

EL Lamp Driver Demoboard

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, or to a

logic circuit output that has a source impedance of less than

20K .Ω

VDD - IC Supply

Supplies the HV833 EL driver IC. The supplied circuit is

optimized for 1.8 to 6.5 volt operation.

VIN - Inductor Supply

Supplies the high voltage power converter.

GND - Circuit Ground

Connect to VDD and VIN negative terminals. Supply bypass

capacitor for both VDD and VIN are provided on the demo

board. External supply bypass capacitors are not necessary.

VA and VB - Lamp Connections

Connect to an EL lamp. Polarity is irrelevant.

Parameter Value

Input voltage 1.8 to 6.5V

Supply current 45mA

Lamp size range 5.5in2 to 10in2

Lamp frequency 250Hz

Converter frequency 70kHz

General Description

HV833

Rsw

REL

CDD

CIN

DIODE

VDD

VIN

GND

EL Lamp

OFF

1.8 - 6.5V

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)