Microchip HV857LDB1 Manual

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Supertex inc.

www.supertex.com

HV857LDB1

Doc.# DSDB-HV857LDB1

A032813

General Description

The Supertex HV857LDB1 demoboard contains all

necessary circuitry to demonstrate the features of the

HV857L EL lamp driver.

Simply connect it to a power supply and a lamp. 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).

Board Layout and Connection Diagram

Low Noise, High Voltage

EL Lamp Driver IC Demoboard

Connections:

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 HV857L EL driver IC. The supplied circuit is

optimized for 3.0V operation. The operating range can be

from 1.8 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 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.

HV857L

CDD

RSW

VDD VB

GND

VIN

CIN

REL

Actual Dimensions: 12mm x 12mm

Parameter Value

Input voltage: 1.8 to 5.0V

Typical supply current: 27mA

Lamp size: 3.0in2

Lamp frequency: 204Hz

Converter frequency: 70kHz

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)