6

HV832

1235 Bordeaux Drive, Sunnyvale, CA 94089

TEL: (408) 744-0100 • FAX: (408) 222-4895

www.supertex.com

12/13/01rev.8

©2001 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.

External Component Description

External Component

Selection Guide Line

Diode

Fast reverse recovery diode, IN914 or equivalent.

Cs Capacitor

0.003

µF to 0.1µF, 100V capacitor to GND is used to store the energy transferred from the inductor.

Lx Inductor

the inductor is being charged. When the internal switch is off, the charge stored in the inductor will be

transferred to the high voltage capacitor C

H-bridge and therefore to the EL lamp. In general, smaller value inductors, which can handle more current,

are more suitable to drive larger size lamps.

Lamp

As the EL lamp size increases, more current will be drawn from the battery to maintain high voltage across

the EL lamp. The input power, (V

dissipation of the package (300mW), an external resistor in series with one side of the lamp is recommended

to help reduce the package power dissipation.

Split Supply Configuration

The HV832 can also be used for handheld devices operating

from a battery where a regulated voltage is available. This is

shown in Figure 2. The regulated voltage can be used to run the

internal logic of the HV832. The amount of current necessary to

run the internal logic is 150

µA Max at a V

the regulated voltage could easily provide the current without

being loaded down.

Figure 2: Split Supply

EL Lamp 1

+

_

1

2

3

4

8

6

5

HV832MG

7

Control

GND

Com

Logic Input Pulse

EL Lamp 2