HV832X Ver la hoja de datos (PDF) - Supertex Inc

Número de pieza

componentes Descripción

Fabricante

HV832X

Dual High Voltage, Low Noise EL Lamp Driver

Supertex Inc 

HV832

External Component Description

External Component

Selection Guide Line

Diode

Fast reverse recovery diode, IN914 or equivalent.

Cs Capacitor

0.003µF to 0.1µF, 100V capacitor to GND is used to store the energy transferred from the inductor.

Lx Inductor

The inductor Lx is used to boost the low input voltage by inductive flyback. When the internal switch is on,

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 CS. The energy stored in the capacitor is connected to the internal

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, (VIN x IIN), will also increase. If the input power is greater than the power

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 150µA Max at a VDD of 3.0V. Therefore,

the regulated voltage could easily provide the current without

being loaded down.

Figure 2: Split Supply

Regulated Voltage=VDD

Logic Input Pulse

+

Battery Voltage=VIN_

CIN

1 EL1

2 VDD

EL2 8

Com 7

3 Control

4 GND

CS 6

LX 5

HV832MG

EL Lamp 1

EL Lamp 2

LX

CS

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

6

12/13/01rev.8

1235 Bordeaux Drive, Sunnyvale, CA 94089

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

www.supertex.com

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