HV839K6 查看數據表（PDF） - Supertex Inc
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HV839K6 Datasheet PDF : 9 Pages
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HV839
Split Supply Configuration
The HV839 can be used in applications operating from a
battery where a regulated voltage is available. This is shown
in Fig. 2. The regulated voltage can be used to drive the
internal logic of HV839. The amount of current used to drive
the internal logic is less than 190µA. Therefore, the regu-
lated voltage could easily provide the current without being
loaded down.
Fig. 2: Split Supply Configuration
VEN = ON
0 = OFF
VEN = ON
0 = OFF
Regulated Voltage = VDD
1
C1
EL1 10
2
VDD
EL2 9
RSW-Osc 3 RSW-Osc COM 8
4
C2
7
CS
5
GND
6
LX
Battery Voltage = VIN
HV839
EL Lamp 11
EL Lamp 21
D
LX
CS
1. The bigger sized lamp should be tied to EL1 and the smaller
sized lamp to EL2 terminals (pins 10 and 9 respectively)
Audible Noise Reduction
This section describes a method (patented) developed at
Supertex to reduce the audible noise emitted by the EL
lamps used in application sensitive to audible noise. The
waveform takes the shape of approximately 2RC time con-
stants for rising and 2RC time constants for falling, where
C is the capacitance of the EL lamp, and R is the external
resistor, RSER connected in series with the EL lamp.
Fig. 3 shows a general circuit schematic that uses the series
resistors, RSER1 and RSER2, for each of the EL lamps. RSER1
and RSER2 are connected in series with the EL lamp. The au-
dible noise can be set a desirable level by selecting the re-
sistances for RSER1 and RSER2. It is important to note that addi-
tion of these external resistors will reduce the voltage across
the EL lamp, and hence the brightness of the EL lamp.
Fig. 3: Typical Application Circuit For Audible Noise Reduction
ON = VEN
OFF = 0
Enable 1
RSER1
ON = VEN
OFF = 0
+
VDD
-
+
VI-N
Enable 2
CDD
CIN
RSW-Osc
1 C1
EL1 10
2 VDD
EL2 9
3 RSW-Osc COM 8
4 C2
CS 7
5 GND
6
LX
HV839
RSER2
EL Lamp 11
EL Lamp 21
D
LX
CS
1. The bigger sized lamp should be tied to EL1 and the
smaller sized lamp to EL2 terminals (pins 10 and 9 respectively)
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
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