Microchip HV857 Handleiding

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Supertex inc.

Supertex inc.

www.supertex.com

Doc.# DSAN-AN-H63

A040413

AN-H63

Application Note

HV857 EL Lamp Driver Circuits

This application note presents six EL driver circuits utilizing

the Supertex HV857 integrated circuit. They have been

optimized for a variety of applications and may be used

as is or used as a starting point in designing a circuit for a

particular application.

When constructing and testing one of the driver circuits listed

below, keep in mind that results may differ from those given

due to component tolerances and lamp characteristics.

When making component changes, always remove supply

voltage rst. After making adjustments, bring up the supply

voltage slowly (starting from the minimum required device

input voltage) while monitoring input current. Excessive

input current may be a good indication of connection errors

or incorrect component values. A sharp rise in current usually

indicates a saturated inductor. To avoid inductor saturation,

use a higher current rated inductor or increase the conversion

frequency by lowering the RSW resistor value.

Circuit Selector Guide

Circuit Applications

Lamp

Color/

Size

(in2)

Lamp

Brightness1

(ft-lm)

Supply

Voltage

(V)

Supply

Current

(mA)

Output

Voltage

(VP-P)

Output

Frequency

(Hz)

1Watches. Green/

1.0 4.22.78.5 166197

2Travel clocks, wall thermostats,

thermometers.

Green/

1.6 5.91.5/3.0 48.0154393

3MP3 players, travel clocks, wall

thermostats, thermometers.

Green/

1.6 3.53.010.0 156197

4Pulse oximeters, cell phones,

glucometers.

Green/

2.0 5.33.011.8 172197

5GPSs, cell phones, organizers,

glucometers, BP monitors.

Green/

3.0 5.93.020.9 172260

6

PDAs, GPSs, cell phones, radios,

clocks, organizers,

glucometers, BP monitors.

Green/

4.0 8.53.038.0 172393

Notes:

1. Lamp brightness can vary by type and manufacturer.

Product specificaties