HV823
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 V
DD
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 R
SW
and R
EL
resistors as shown in Figure 4.
Split Supply Configuration for Battery
Voltages of Higher than 9.5V
Figure 5 can also be used with high battery voltages such as 12V
as long as the input voltage, V
DD
, to the HV823 device is within
its specifications of 2.0V to 9.5V.
Figure 5: Split Supply Configuration
ON =V
DD
OFF = 0
V
DD
= Regulated
Voltage
R
SW
L
x
+
V
IN
= Battery
Voltage
Remote
Enable
R
EL
1
2
3
-
0.1µF*
C
S
100V
1N4148
V
DD
R
SW-osc
C
s
L
x
R
EL-osc
V
A
V
B
GND
8
7
EL Lamp
6
5
4
HV823LG
*Larger values may be required depending upon supply impedance.
For additional information, see Application Notes AN-H33 and AN-H34.
11/12/01
©2001 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
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