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HV859 Datasheet(PDF) 4 Page - Supertex, Inc

Part # HV859
Description  High Voltage EL Lamp Driver for Low Noise Applications
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Manufacturer  SUTEX [Supertex, Inc]
Direct Link  http://www.supertex.com
Logo SUTEX - Supertex, Inc

HV859 Datasheet(HTML) 4 Page - Supertex, Inc

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Supertex inc.
www.supertex.com
Doc.# DSFP-HV859
C073013
HV859
Split Supply Configuration
Fig. 2: Split Supply and Enable/Disable Configuration
Regulated
Voltage = V
DD
D
+
V
IN
-
C
IN
R
SW
R
EL
C
S
L
X
EL Lamp
Enable Signal
ON = V
DD
OFF = 0V
1
2
3
4
8
7
6
5
HV859
VDD
RSW-Osc
REL-Osc
GND
VA
VB
CS
LX
The HV859 can also be used for handheld devices operating
from a battery where a regulated voltage is available. This
is shown in Fig. 2. The regulated voltage can be used to
run the internal logic of the HV859. The amount of current
necessary to run the internal logic is 150µA max at a V
DD of
3.0V. Therefore, the regulated voltage could easily provide
the current without being loaded down.
The HV859 can be easily enabled and disabled via a logic
control signal on the R
SW and REL resistors as shown in Fig. 2
below. The control signal can be from a microprocessor. R
SW
and R
EL 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.
Fig. 1: Typical Application/Test Circuit
V
DD
V
DD = VIN
Enable Signal
ON = V
DD
OFF = 0V
560k
2.0M
1.0F
220H*
2.0k
Equivalent to 3.0in2 lamp
10nF
BAS21**
3.3nF
200V
* Murata Inductor - LQH32CN221K21
** BAS21 - General Purpose HV diode
1
2
3
4
8
7
6
5
HV859
VDD
RSW-Osc
REL-Osc
GND
VA
VB
CS
LX
+
-


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