HV860K7-G Supertex, HV860K7-G Datasheet - Page 5

• Manufacturer Part Number: HV860K7-G
• Description: Display Drivers & Controllers EL LAMP DRIVER
• Manufacturer: Supertex

Specifications of HV860K7-G

• Driver Type: EL Lamp Drivers
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-12
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Split Supply Configuration
The HV860 can also be used for handheld devices operating
from a battery where a regulated voltage is available. This
is shown in Figure 2. The regulated voltage can be used to
run the internal logic of the HV860. The amount of current
Enable/Disable Configuration
The HV860 can be easily enabled and disabled via a logic
control signal on the EN pin as shown in Figure 2. The
control signal can be from a microprocessor. When the
Figure 2: Split Supply and Enable/Disable Configuration
Audible Noise Reduction
The EL lamp, when lit, emits an audible noise. This is due
to EL lamp construction. The audible noise generated by the
EL lamp can be a major problem for applications where the
EL lamp is held close to the ear, such as cellular phones.
Figure 3: Typical Application Circuit for Audible Noise Reduction
How to Minimize EL Lamp Audible Noise
The audible noise from the EL lamp can be minimized with
the proper selection of R
VREF and VREG pins. VREG has an internal 60pF capacitor
Regulated Voltage = V
On = 1.5V
Off = 0V
1.5V = On
0V = Off
V
DD
V
DD
REG
IN
. R
C
C
DD
DD
REG
+
-
is connected between the
●
V
IN
1235 Bordeaux Drive, Sunnyvale, CA 94089
R
R
R
R
SW
SW
EL
EL
11
11
10
12
10
12
1
1
C
EN
VDD
EN
REL-Osc
IN
RSW-Osc
VDD
RSW-Osc
REL-Osc
C
VREG
IN
VREG
2
2
R
R
REG
REG
GND
4
4
GND
VREF
5
VREF
3
3
necessary to run the internal logic is 250µA max. Therefore,
the regulated voltage could easily provide the current without
being loaded down.
microprocessor signal is high the device is enabled, and
when the signal is low, it is disabled.
The HV860 employs a proprietary circuit to help minimize
the EL lamp’s audible noise by using a single resistor, R
as shown in Figure 3.
to ground. EL lamp noise can be minimized without much
loss in brightness by setting the RC time constant to be
approximately 1/12 of the EL frequency’s period.
HV860
HV860
L
L
X
5
5
X
LX
LX
VB
CS
VA
VB
CS
VA
7
8
9
7
8
9
●
D
D
Tel: [phone]
C
C
EL
Lamp
S
EL
Lamp
S
●
www.supertex.com
HV860
REG
,