HV823
Split Supply Configuration for Battery
Voltages of Higher than 9.5V
Split Supply Configuration Using a Single
Cell (1.5V) Battery
The HV823 can also be used for handheld devices operating
from a single cell 1.5V battery where a regulated voltage is
available. This is shown in Figure 5. The regulated voltage
can be used to run the internal logic of the HV823. The
amount of current necessary to run the internal logic is
typically 100µA at a VDD of 3.0V. Therefore, the regulated
voltage could easily provide the current without being loaded
down. The HV823 used in this configuration can also be
enabled/disabled via logic control signal on the RSW and REL
resistors as shown in Figure 4.
Figure5canalsobeusedwithhighbatteryvoltagessuchas12V
as long as the input voltage, VDD, to the HV823 device is within
its specifications of 2.0V to 9.5V.
Figure 5: Split Supply Configuration
Remote
Enable
ON =VDD
REL
OFF = 0
V
DD = Regulated
VDD
REL-osc
VA
8
7
6
5
Voltage
RSW
RSW-osc
Cs
2
3
4
Lx
EL Lamp
+
-
VB
VIN = Battery
Voltage
1N4148
GND
Lx
0.1µF*
HV823LG
CS
100V
*Larger values may be required depending upon supply impedance.
For additional information, see Application Notes AN-H33 and AN-H34.
11/12/01
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 744-0100 • FAX: (408) 222-4895
www.supertex.com
©2001 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
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