Microchip HV825 Handleiding

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Supertex inc.

Supertex inc.

www.supertex.com

Doc.# DSAN-AN-H34

A101513

AN-H34

Application Note

HV823 & HV825

EL Lamp Driver Circuits

This application note presents fourteen EL driver circuits

utilizing the Supertex HV823 and HV825 drivers. 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. For

the HV823, a 1.0nF capacitor from pin 2 to GND is needed

when a 0.01µF CS capacitor is used.

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. A sharp rise in

current usually indicates a saturated inductor. Use a higher

current rated inductor, a higher value inductor, or increase

conversion frequency by lowering RSW.

Circuit Selector Guide

Circuit Applications

Lamp

Color/Size

(in2)

Lamp

Brightness1,2

(ft-lm)

Supply

Voltage

(V)

Supply

Current

(mA)

Output

Voltage

(VP-P)

Output

Frequency

(Hz)

1Travel clocks, wall thermostatsGreen/1.53.61.527450110

2PagersGreen/2.73.31.5 45300110

3Pagers (low current)Green/1.54.83.010134260

4PagersGreen/1.76.61.5/3.0 35140400

5GPS units, cell phones, organizersGreen/3.56.23.325148400

6GPS units, organizersGreen/6.03.03.321149170

7 White/7.0PDA, HPC5.85.030 126400

7.89.023 150400

8

GPS units, organizers, RFDC units,

handheld scanners, cell phones,

clocks, radios

Green/8.0 6.25.030140 400

9Instrument panels,

keyboard backlightsWhite/9.04.712/5.0 12156800

10Green/10.0 4.15.022 145260PDA, HPC

11 PDA, HPCGreen/12.0 5.23.351 144260

12Green/12.0 3.25.019260PDA, HPC115

13 White/13.0PDA, HPC, keypad3.15.0 34400110

6.69.035 140400

14White/23.02.13.348 103250PDA, HPC

Notes:

1. Lamp brightness can vary by type and manufacturer.

2. White lamps are inherently less efficient.

Product specificaties