HV831MG 查看數據表（PDF） - Supertex Inc
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HV831MG Datasheet PDF : 8 Pages
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Split Supply Configuration
HV831
The HV831 can be used in applications operating from a battery of HV831. The amount of current used to drive the internal logic
where a regulated voltage is available. This is shown in Figure is less than 150µA. Therefore, the regulated voltage could easily
2. The regulated voltage can be used to drive the internal logic provide the current without being loaded down.
Figure 2: Split Supply Configuration
VDD = ON
VDD = ON 0 = OFF
Enable 1
0 = OFF
Enable 2
1 C1
EL1 10
Regulated Voltage = VDD
2
RSW-OSC
VDD
3 RSW-OSC
EL2 9
Com 8
4 C2
CS 7
Battery Voltage = VIN
5 GND
LX 6
HV831MG
EL Lamp 11
D
~LX
EL Lamp 21
CS
Audible Noise Reduction
1 The bigger sized lamp should be tied to EL1 and the smaller
sized lamp to EL2 terminals (pins 10 and 9 respectively)
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 constants 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.
Figure 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 audible noise
can be set a desirable level by selecting the resistances for RSER1
and RSER2. It is important to note that addition of these external
resistors will reduce the voltage across the EL lamp, and hence the
brightness of the EL lamp.
Figure 3: Typical Application Circuit For Audible Noise Reduction
ON = VDD
OFF = 0V
Enable 1
ON = VDD
OFF = 0V
+
VDD
-
+
VIN
-
Enable 2
CDD
CIN
1 C1
EL1 10
2
RSW-OSC
VDD
3 RSW-OSC
EL2 9
Com 8
4 C2
CS 7
5 GND
LX 6
HV831MG
RSER1
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)
7
A081005
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