HV823 Ver la hoja de datos (PDF) - Supertex Inc
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HV823 Datasheet PDF : 8 Pages
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HV823
Enable/Disable Configuration
The HV823 can be easily enabled and disabled via a logic
control signal on the RSW and REL resistors as shown in Fig.
4. The control signal can be from a microprocessor. RSW
and REL are typically very high values, therefore, only 10’s
of microamperes 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.
Enable/Disable Table
RSW Resistor
VDD
0V
HV823
Enable
Disable
Fig. 4: Enable/Disable Configuration
ON = VDD
OFF = 0V
Remote Enable
REL
+
VIN = VDD
-
RSW
LX
4.7µF
15V
1N4148
CS
100V
1 VDD
REL-Osc 8
2 RSW-Osc
VA 7
3 CS
VB 6
4 LX
GND 5
1.0nF HV823
EL Lamp
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 Fig. 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
Fig. 4.
Split Supply Configuration for Battery Voltages of Higher than 9.5V
Fig. 5 can also be used with high battery voltages, such as is within its specifications of 2.0V to 9.5V.
12V, as long as the input voltage, VDD, to the HV823 device
Fig. 5: Split Supply Configuration
ON = VDD
OFF = 0
VDD = Regulated
Voltage
+
VIN = Battery
Voltage
-
Remote Enable
REL
RSW
LX
1N4148
0.1µF*
CS
100V
1 VDD
REL-Osc 8
2 RSW-Osc
VA 7
3 CS
VB 6
4 LX
GND 5
HV823
EL Lamp
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
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