HV841K6-G Supertex, HV841K6-G Datasheet - Page 5

• Manufacturer Part Number: HV841K6-G
• Description: Display Drivers High Voltage Dual EL Lamp
• Manufacturer: Supertex

Specifications of HV841K6-G

• Mounting Style: SMD/SMT
• Package / Case: DFN-10
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 3: Typical Application Circuit For Audible Noise Reduction
Split Supply Configuration
The HV841 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 HV841. 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,
R
SER
connected in series with the EL lamp.
Regulated Voltage = V
V
0 = OFF
ON = V
OFF =
EN
Battery Voltage = V
V
V
DD
IN
= ON
+
-
+
-
0
EN
V
0 = OFF
ON = V
OFF =
EN
= ON
Enable 2
0
EN
DD
IN
1. The bigger sized lamp should be tied to EL1 and the smaller
●
1. The bigger sized lamp should be tied to EL1 and the smaller
C
Enable 1
C
1235 Bordeaux Drive, Sunnyvale, CA 94089
sized lamp to EL2 terminals (pins 10 and 9 respectively)
DD
IN
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
HV841
HV841
5
the internal logic is less than 190µA. Therefore, the regulated
voltage could easily provide the current without being loaded
down.
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
addition of these external resistors will reduce the voltage
across the EL lamp, and hence the brightness of the EL
lamp.
COM
COM
SER1
EL1
EL2
EL1
EL2
CS
LX
CS
LX
and R
10
10
9
7
6
8
6
9
8
7
●
SER2
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~
R
R
L
SER1
SER2
X
D
are connected in series with the EL lamp.
L
SER1
X
D
SER1
and R
EL Lamp 1
and R
EL Lamp 1
C
S
●
SER2
EL Lamp 2
SER2
C
www.supertex.com
1
S
, for each of the EL lamps.
. It is important to note that
1
1
EL Lamp 2
HV841
1