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High-Voltage EL Lamp Driver
Ordering Information
Package Options
Device
HV803
Input Voltage
2.4V to 9.5V
8-Lead SO
HV803LG
Die
HV803X
HV803
Features
Processed with
HVCMOS
廬
technology
2.4V to 9.5V operating supply voltage
DC to AC conversion
180V peak-to-peak typical output voltage
Large output load capability typically 30nF
Short circuit protection on outputs
Adjustable output lamp frequency to control lamp color,
lamp life, and power consumption
Adjustable converter frequency to eliminate harmonics and
optimize power consumption
Enable/disable function
Low current draw under no load condition
General Description
The Supertex HV803 is a high-voltage driver designed for driving
EL lamps of up to 30nF. EL lamps greater than 30nF can be
driven for applications not requiring high brightness. The input
supply voltage range is from 2.4 to 9.5V. The device uses a single
inductor and a minimum number of passive components. The
nominal regulated output voltage that is applied to the EL lamp
is
鹵90V.
The chip can be enabled by connecting the resistors on
R
SW-osc
and R
EL-osc
to V
DD
and disabled when connected to GND.
The HV803 has two internal oscillators, a switching MOSFET,
and a high-voltage EL lamp driver. The frequency for the switch-
ing converter MOSFET is set by an external resistor connected
between the R
SW-osc
pin and the supply pin V
DD
. The EL lamp
driver frequency is set by an external resistor connected be-
tween R
EL-osc
pin and the V
DD
pin. An external inductor is
connected between the L
x
and V
DD
pins. A 0.01碌F to 0.1碌F
capacitor is connected between C
S
and GND pins. The EL lamp
is connected between V
A
and V
B
pins.
The switching MOSFET charges the external inductor and
discharges it into the C
s
capacitor. The voltage at C
s
will start to
increase. Once the voltage at C
s
reaches a nominal value of 90V,
the switching MOSFET is turned OFF to conserve power. The
outputs V
A
and V
B
are configured as an H-bridge and are
switched in opposite states to achieve 180V peak-to-peak across
the EL lamp.
Applications
Pagers
Cellular phones
Electronic personal organizers
GPS units
Handheld personal computers
Portable instrumentation
15
Pin Configuration
Absolute Maximum Ratings*
Supply Voltage, V
DD
Output Voltage, V
Cs
Operating Temperature Range
Storage Temperature Range
Power Dissipation
Note:
*All voltages are referenced to GND.
蟼螒
V
DD
R
SW-osc
C
s
L
x
1
2
3
4
8
7
6
5
R
EL-osc
V
A
V
B
GND
-0.5V to +10V
-0.5V to +120V
-25擄C to +85擄C
-65擄C to +150擄C
400mW
SO-8
15-1
1
2
3
4
5
6
7
8
