HV831MG Supertex, HV831MG Datasheet - Page 5

• Manufacturer Part Number: HV831MG
• Description: Display Drivers Hi V Low Noise
• Manufacturer: Supertex

Specifications of HV831MG

• Driver Type: EL Lamp Drivers
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: MSOP-10
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Split Supply Configuration
The HV831 can be used in applications operating from a
battery where a regulated voltage is available. This is shown
in Figure 2. The regulated voltage can be used to drive the
internal logic of HV831. The amount of current used to drive
Figure 2: Split Supply Configuration
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 constants for
rising and 2RC time constants for falling, where C is the
capacitance of the EL lamp, and R is the external resistor,
Figure 3: Typical Application Circuit For Audible Noise Reduction
Regulated Voltage = V
Supertex inc.
ON = V
OFF =
V
0 = OFF
Battery Voltage = V
V
DD
V
DD
IN
= ON
+
-
+
-
0
DD
ON = V
OFF =
V
0 = OFF
DD
Enable 2
= ON
0
DD
IN
DD
1. The bigger sized lamp should be tied to EL1 and the smaller
●
C
Enable 1
C
sized lamp to EL2 terminals (pins 10 and 9 respectively)
1235 Bordeaux Drive, Sunnyvale, CA 94089
DD
IN
1. The bigger sized lamp should be tied to EL1 and the smaller
sized lamp to EL2 terminals (pins 10 and 9 respectively)
R
R
SW-Osc
SW-Osc
2
1
3
4
5
2
1
3
4
5
C1
VDD
RSW-Osc
C2
GND
C1
VDD
RSW-Osc
C2
GND
HV831
HV831
5
the internal logic is less than 150µA. Therefore, the regulated
voltage could easily provide the current without being loaded
down.
R
Figure 3 shows a general circuit schematic that uses the
series resistors, R
R
The audible noise can be set a desirable level by selecting
the resistances for R
COM
COM
EL1
EL2
EL1
EL2
SER
SER1
CS
LX
CS
LX
connected in series with the EL lamp.
10
9
7
6
8
10
and R
9
7
6
8
●
~
SER2
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~
R
R
L
SER1
SER2
X
D
L
are connected in series with the EL lamp.
X
SER1
D
EL Lamp 1
SER1
and R
EL Lamp 1
C
and R
S
●
SER2
EL Lamp 2
1
C
www.supertex.com
EL Lamp 2
S
SER2
1
, for each of the EL lamps.
. It is important to note
1
1
HV831