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HV857X

High Voltage EL Lamp Driver for Low Noise Applications

Supertex Inc 

Split Supply Configuration

The HV857 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 HV857. The amount of current neces-

sary 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.

HV857

Enable/Disable Configuration

The HV857 can be easily enabled and disabled via a logic control

signal on the RSW and REL resistors as shown in Figure 2 below.

The control signal can be from a microprocessor. RSW and REL

are typically very high values. Therefore, only 10’s of microam-

peres will be drawn from the logic signal when it is at a logic high

(enable) state. When the microprocessor signal is high the

device is enabled and when the signal is low, it is disabled.

Figure 2: Split Supply and Enable/Disable Configuration

ON=VDD

OFF=0

Enable Signal

Regulated Voltage=VDD

+

Battery Voltage=VIN_

CIN

1 VDD

VA 8

2 RSW-osc

VB 7

3 REL-osc

4 Gnd

CS 6

LX 5

HV857MG

LX

EL Lamp

CS

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

6

11/14/01rev.10

1235 Bordeaux Drive, Sunnyvale, CA 94089

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

www.supertex.com

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