Microchip HV853DB1 Handleiding

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Supertex inc.

www.supertex.com

HV853DB1

Doc.# DSDB-HV853DB1

A032813

General Description

The Supertex HV853DB1 demoboard contains all the

necessary circuitry to demonstrate the features of the HV853

EL lamp driver. The HV853 is the low noise version of the EL

driver HV852 with improved EMI performance.

Simply connect it to a power supply and a lamp as shown in

Figure 1. For additional assistance with the HV853 demoboard

circuit, please refer to the HV853 datasheet.

High Voltage, Low Noise, Inductorless

EL Lamp Driver Demoboard

Specications

Parameter Value

Input voltage: 3.2V to 5.0V

Supply current: 18mA

Lamp size: 0.93in2 and 1.5in2

Lamp frequency: 274Hz

Connections:

VDD (IC Supply)

Supplies the HV853 EL driver IC. The supplied demoboard

is optimized for 3.2 to 5.0V operation.

EN (Enable Input)

A logic input which enables/disables the driver. Connect

EN to logic high (VDD) to enable the driver and to logic low

(GND) to disable the driver. This input may be connected to

a mechanical switch or to a logic circuit output.

CLKIN (Clock Input)

A logic input pin to which an external clock can be applied to

set the EL lamp frequency. CLKEN has to be connected to

VDD when external clock input is used. Also, the REL resistor

needs to be removed and the REL pin needs to be connected

to ground. Connect CLKIN to GND if not used.

GND (Circuit Ground)

Connect to VDD negative terminal. Supply bypass capaci-

tor for VDD is provided on the demoboard. External supply

bypass capacitors are not required.

VA and VB (Lamp Connections)

They connect to EL lamp terminals. Polarity is irrelevant.

CLKEN (Clock Enable)

Logic input pin which enables/disables the external clock ap-

plied. Logic high (VDD) will cause the EL lamp frequency to

be set by the CLKIN input. Logic low (GND) will cause the EL

lamp frequency to be set by the external REL resistor.

Note:

All of the above connections must be made before powering up the supply voltages.

Board Layout and Connection Diagram

Actual Dimensions: 13mm x 8mm

VDD

CLKIN

GND

CLKEN

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)