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HV843K7-G

Description
display drivers & controllers low noise dual
CategoryAnalog mixed-signal IC    Drivers and interfaces   
File Size462KB,6 Pages
ManufacturerSupertex
Environmental Compliance
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HV843K7-G Overview

display drivers & controllers low noise dual

HV843K7-G Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
Is it Rohs certified?conform to
MakerSupertex
Parts packaging codeSOIC
package instructionHVSON,
Contacts10
Reach Compliance Codecompliant
ECCN codeEAR99
Interface integrated circuit typeEL DISPLAY DRIVER
JESD-30 codeS-PDSO-N10
JESD-609 codee3
length3 mm
Multiplex display functionNO
Number of functions1
Number of segments2
Number of terminals10
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Package body materialPLASTIC/EPOXY
encapsulated codeHVSON
Package shapeSQUARE
Package formSMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)NOT SPECIFIED
Certification statusNot Qualified
Maximum seat height0.8 mm
Maximum supply voltage5.8 V
Minimum supply voltage2 V
Nominal supply voltage5.5 V
surface mountYES
Temperature levelINDUSTRIAL
Terminal surfaceMatte Tin (Sn)
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width3 mm
Supertex inc.
Low Noise Dual EL Lamp Driver
Features
Low audible noise
Independent input control for lamp selection
180V
pp
output voltage
Split supply capability
Patented output timing
One miniature inductor to power both lamps
Low shutdown current
Wide input voltage range 2.0 to 5.8V
Output voltage regulation
No SCR output
Available in 10-Lead DFN package
HV843
General Description
The Supertex HV843 is a low noise, high voltage driver designed
for driving two EL lamps with a combined area of 3.5 square
inches. The input supply voltage range is from 2.0V to 5.8V.
The device is designed to reduce the amount of audible noise
emitted by the lamp. This device uses a single inductor and a
minimum number of passive components to drive two EL lamps.
The nominal regulated output voltage of ±90V is applied to the
EL lamps. The two EL lamps can be turned ON and OFF by the
two logic input control pins, C1 and C2. The device is disabled
when both C1 and C2 (pins 1 and 4) are at logic low.
The HV843 has an internal oscillator, a switching MOSFET,
and two high voltage EL lamp drivers. Each driver has its own
half bridge common output (COM1 and COM2) connected to
a single pin called COM which minimizes the DC offset seen
by the EL lamp. An external resistor connected between
the RSW-Osc pin and the voltage supply pin, VDD, sets the
frequency for the switching MOSFET. The EL lamp driver
frequency is set by dividing the MOSFET switching frequency
by 512. An external inductor is connected between the LX
and the VDD pins. Depending on the EL lamp size, a 1.0 to
10.0nF, 100V capacitor is connected between CS and Ground.
The switching MOSFET charges the external inductor and
discharges it into the capacitor at CS. The voltage at CS
increases. Once the voltage at CS reaches a nominal value of
90V, the switching MOSFET is turned OFF to conserve power.
Applications
Dual display cellular phones
Keypad and LCD backlighting
Portable instrumentation
Dual segment lamps
Hand held wireless communication devices
Typical Application Circuit
1.5V
1.5V
0
0
1
C1
EL1
10
EL2
9
COM
8
CS
7
LX
6
EL Lamp 1
EL Lamp 2
+
-
V
DD
C
DD
0.1µF
845kΩ
2
VDD
3
RSW-Osc
4
C2
D
L
X
330µH
C
S
3.3nF, 100V
+
-
V
IN
C
IN
4.7µF
5
GND
HV843
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com
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