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HV841MG-G

Description
high voltage dual EL lamp driver
File Size292KB,7 Pages
ManufacturerSupertex
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HV841MG-G Overview

high voltage dual EL lamp driver

Supertex inc.
High Voltage Dual EL Lamp Driver
Features
Independent input control for lamp selection
Split supply capability
Patented output timing
One miniature inductor to power both lamps
Low shutdown current
Wide input voltage range 2.0V to 5.8V
Output voltage regulation
No SCR output
Available in small packages (10-lead MSOP and
10-lead DFN/MLP)
HV841
Initial Release
General Description
The Supertex HV841 is a 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 minimum number of passive components
to drive two EL lamps. The nominal regulated output voltage of
±100V is applied to the EL lamps. The chip can be enabled/ disabled
by connecting C
1
and C
2
(pins 1 and 4) to V
EN
/ Ground.
The HV841 has an internal oscillator, a switching MOSFET, and two
high voltage EL lamp drivers. An external resistor connected between
the R
SW-OSC
and the voltage supply pin V
DD
sets the frequency for the
switching MOSFET. The EL lamp driver frequency is set by dividing
the MOSFET switching frequency by 128. An external inductor is
connected between the L
X
and the V
DD
pins. Depending on the EL
lamp size, a 1.0 to 10.0nF, 200V capacitor is connected between C
S
and Ground. The two EL lamps are connected between EL
1
to Com
and EL
2
to Com.
The switching MOSFET charges the external inductor and discharges
it into the capacitor at C
S
. The voltage at C
S
increases. Once the
voltage at C
S
reaches a nominal value of 100V, the switching
MOSFET is turned off to conserve power. The outputs EL
1
to Com
and EL
2
to Com are configured as H bridges and switch in opposite
states to achieve 200V across the EL lamp.
Applications
Mobile cellular phones, dual display
Keypad and LCD backlighting
Portable instrumentation
Dual segment lamps
Hand held wireless communication devices
Typical Application Circuit
V
EN
= ON
0 = OFF
V
EN
= ON
0 = OFF
1
EL Lamp 1
1
C
1
V
DD
EL
1
EL
2
10
9
8
7
6
+
V
DD
-
C
DD
R
SW-OSC
2
3
4
5
R
SW-OSC
Com
C2
GND
C
S
L
X
EL Lamp 2
1
D
V
IN
+
C
IN
-
HV841MG-G/
HV841K6-G
~
L
X
C
S
1 The bigger sized lamp should be tied to EL1 and the smaller
sized lamp to EL2 terminals (pins 10 and 9 respectively)
NR033106
Supertex inc.
·
1235 Bordeaux Drive, Sunnyvale, CA 94089
·
Tel: (408) 222-8888
·
FAX: (408) 222-4895
·
www.supertex.com
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