15-1
15
HV803
High-Voltage EL Lamp Driver
Features
Processed with HVCMOS
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
Absolute Maximum Ratings*
Supply Voltage, V
DD
-0.5V to +10V
Output Voltage, V
Cs
-0.5V to +120V
Operating Temperature Range
-25C to +85C
Storage Temperature Range
-65C to +150C
Power Dissipation
400mW
Note:
*All voltages are referenced to GND.
Package Options
Device
Input Voltage
8-Lead SO
Die
HV803
2.4V to 9.5V
HV803LG
HV803X
Ordering Information
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 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 0.01F to 0.1F
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.
Pin Configuration
V
DD
R
EL-osc
R
SW-osc
V
A
C
s
V
B
L
x
GND
Applications
Pagers
Cellular phones
Electronic personal organizers
GPS units
Handheld personal computers
Portable instrumentation
1
2
3
4
8
7
6
5
SO-8
OBSOLETE
15-2
Symbol
Parameter
Min
Typ
Max
Units
Conditions
R
DS(on)
On-resistance of switching transistor
3.5
8.0
I = 100mA
V
CS
Output voltage V
CS
Regulation
80
90
100
V
V
IN
= 2.4 to 9.5V
V
A
- V
B
Output peak to peak voltage
160
180
200
V
V
IN
= 2.4V to 9.5V
I
DDQ
Quiescent V
DD
supply current, disabled
2.0
A
R
SW-osc
= GND
I
DD
Input current going into the V
DD
pin
100
A
V
IN
= 3.0V 5%. See Figure 1.
300
A
V
IN
= 5.0V 5%. See Figure 2.
500
A
V
IN
= 9.0V 5%. See Figure 3.
I
IN
Input current including inductor current
35
mA
V
IN
= 3.0V. See Figure 1.
V
CS
Output voltage on V
CS
45
70
V
V
IN
= 3.0V. See Figure 1.
f
EL
V
A-B
output drive frequency
300
430
Hz
V
IN
= 3.0V. See Figure 1.
f
SW
Switching transistor frequency
50
90
KHz
V
IN
= 3.0V. See Figure 1.
D
Switching transistor duty cycle
88
%
Electrical Characteristics
DC Characteristics
(V
IN
= 3.0V, R
SW
= 750K, R
EL
= 2.0M, T
A
= 25C unless otherwise specified)
Symbol
Parameter
Min
Typ
Max
Units
Conditions
V
DD
Supply voltage
2.4
9.5
V
T
A
Operating temperature
-25
85
C
Recommended Operating Conditions
R
SW
resistor
HV803
V
DD
Enabled
GND
Disabled
Enable/Disable Table
(See Figure 4)
HV803
OBSOLETE
15-3
15
Figure 1: Test Circuit, V
IN
= 3.0V
(Low input current with moderate output brightness).
Note:
1. Murata part # LQH4N561K04 (DC resistance < 14.5)
2. Larger values may be required depending upon supply impedance.
1
7
2
3
4
8
6
5
V
IN
= 3.0V
ON = V
DD
OFF = 0V
0.1F
100V
0.1F
2
560H
1
1N4148
750K
2M
2.0K
10nF
Equivalent to 3 square inch lamp.
HV803
L
x
GND
V
B
V
A
R
EL-osc
V
DD
R
SW-osc
C
s
Block Diagram
Switch
Osc
C
+
_
Vref
Disable
Output
Osc
GND
V
DD
R
SW-osc
R
EL-osc
Q
Q
Q
V
A
C
s
L
x
V
B
Q
For additional information, see application note AN-H33.
HV803
OBSOLETE
15-5
15
Figure 2: Typical 5.0V Application*
1
7
2
3
4
8
6
5
V
IN
= 5.0V
0.1F
100V
1nF
560H
1
1N4148
750K
2M
2.0K
6 in
2
lamp
HV803
L
x
GND
V
B
V
A
R
EL-osc
V
DD
R
SW-osc
C
s
ON = V
DD
OFF = 0V
0.1F
2
Typical Performance Curves for Figure 2
90
85
80
75
70
65
5
4
7
8
6
8
7.5
7
6.5
6
5.5
5
4
7
8
6
40
38
36
34
32
30
5
4
7
8
6
40
38
36
34
32
30
70
80
85
90
75
V
CS
(V)
I
IN
(mA)
Brightness (ft-Im)
I
IN
(mA)
V
IN
(V)
V
IN
(V)
V
IN
(V)
V
CS
(V)
V
CS vs.
V
IN
Brightness vs. V
IN
I
IN
vs.
V
IN
I
IN vs.
V
CS
(V)
Note:
1. Murata part # LQH4N561K04 (DC resistance < 14.5)
2. Larger values may be required depending upon supply impedance.
For additional information, see application note AN-H33.
HV803
OBSOLETE
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