Microchip HV833 Handleiding

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Supertex inc.

Supertex inc.

www.supertex.com

Doc.# DSAN-AN-H45

A082113

AN-H45

Application Note

HV833 EL Lamp Driver Circuits

This application note presents eight EL driver circuits

utilizing the Supertex HV833 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 the

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

Lamp

Color/

Size

(in2)

Lamp

Brightness1

(ft-lm)

Supply

Voltage

(V)

Supply

Current

(mA)

Output

Voltage

(VP-P)

Output

Frequency

(Hz)

1Green

10.0 2.93.3 29.2159 138

2White

8.8 5.63.3 50.7150 312

3Green

5.5 4.63.0 26.8151 220

4Green

11.0 3.13.0/5.0 18.2171138

5Green

3.0 8.23.3 23.0167 312

6Green

8.5 6.33.3 54.6177 312

7Green

10.0 6.75.0 54.1157 465

8White

8.8 9.53.0/12 24.5176465

Notes:

1. Lamp brightness can vary by type and manufacturer.

Product specificaties