HV839K6-G Supertex, HV839K6-G Datasheet - Page 5

• Manufacturer Part Number: HV839K6-G
• Description: Display Drivers High Voltage Dual EL Lamp
• Manufacturer: Supertex

Specifications of HV839K6-G

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

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
Fig. 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 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, R
Fig. 3: Typical Application Circuit For Audible Noise Reduction
V
0 = OFF
ON = V
OFF = 0
SER
EN
Regulated Voltage = V
V
= ON
Supertex inc.
V
DD
connected in series with the EL lamp.
Battery Voltage = V
+
IN
-
+
-
EN
V
0 = OFF
ON = V
OFF = 0
EN
= ON
Enable 2
EN
DD
IN
1. The bigger sized lamp should be tied to EL1 and the
1. The bigger sized lamp should be tied to EL1 and the smaller
Enable 1
C
C
1235 Bordeaux Drive, Sunnyvale, CA 94089
DD
IN
smaller sized lamp to EL2 terminals (pins 10 and 9 respectively)
sized lamp to EL2 terminals (pins 10 and 9 respectively)
R
R
SW-Osc
SW-Osc
1
2
3
4
5
1
2
3
4
5
C1
VDD
RSW-Osc
C2
GND
C1
VDD
RSW-Osc
C2
GND
HV839
5
HV839
the internal logic is less than 190µA. Therefore, the regu-
lated voltage could easily provide the current without being
loaded down.
Fig. 3 shows a general circuit schematic that uses the series
resistors, R
and R
dible noise can be set a desirable level by selecting the re-
sistances for R
tion of these external resistors will reduce the voltage across
the EL lamp, and hence the brightness of the EL lamp.
COM
COM
EL1
EL2
SER2
EL1
EL2
CS
CS
LX
LX
are connected in series with the EL lamp. The au-
10
9
8
7
6
SER1
10
9
8
7
6
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SER1
and R
and R
R
R
L
SER1
SER2
X
L
SER2
X
D
SER2
D
, for each of the EL lamps. R
EL Lamp 1
. It is important to note that addi-
EL Lamp 1
www.supertex.com
C
1
S
C
S
EL Lamp 2
EL Lamp 2
1
HV839
1
1
SER1