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Электронный компонент: HV833X

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HV833
HV833
High Voltage EL Lamp Driver
Features
1.8V to 6.5V operating supply voltage
DC to AC conversion
Separately adjustable lamp and converter frequency
Output voltage regulation
Enable/disable function
Patented output timing for high efficiency
<100nA shutdown current
Split supply capability
LCD backlighting
General Description
The Supertex HV833 is a high voltage driver designed for driving
EL lamps of up to 35nF (10-12in
2
). The input supply voltage
range is from 1.8V to 6.5V. 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/disabled by connecting the resistor on
R
SW-OSC
to V
DD
/ground.
The HV833 has two internal oscillators, a switching MOSFET,
and a high voltage EL lamp driver. The frequency for the
switching 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 between
R
EL-osc
pin and the V
DD
pin. An external inductor is connected
between the L
X
and V
DD
or V
IN
pins. A 0.003-0.1F capacitor is
connected between C
S
and ground. The EL lamp is connected
between V
A
and V
B
.
The switching MOSFET charges the external inductor and
discharges it into the capacitor at C
S
. 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
switching in opposite states to achieve 180V peak-to-peak
across the EL lamp.
Applications
Portable Transceivers
Remote Control Units
Calculators
PDAs
Global Positioning Systems (GPS)
05/02/02
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability
indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to
workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the
Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.
Demo Kit
Available
EL Lamp
+
_
1
2
3
4
8
6
5
HV833MG
7
V
IN
V
DD
R
SW-osc
R
EL-osc
Gnd
L
X
C
S
V
B
V
A
L
X
V
DD
Enable Signal
ON=V
DD
OFF=0
1N914
Cs
100V
Typical Application
2
HV833
Symbol
Parameter
Min
Typ
Max
Units
Conditions
R
DS(on)
On-resistance of switching transistor
4.0
I=100mA
V
Cs
Max. output regulation voltage
80
90
100
V
V
DD
=1.8V to 6.5V
V
A-B
Max. of differential output voltage
160
180
200
V
V
DD
=1.8V to 6.5V
across lamp
I
DDQ
Quiescent V
DD
supply current
100
nA
R
SW-osc
= Low
I
DD
Input current going into the V
DD
pin
150
A
V
DD
=1.8V to 6.5V. See Figure 1.
I
IN
Input current including inductor current
56
64
mA
V
IN
=3.3V. See Figure 1.
V
CS
Output voltage on V
CS
63
72
81
V
V
IN
=3.3V. See Figure 1.
f
EL
V
A-B
output drive frequency
240
270
300
Hz
V
IN
=3.3V. See Figure 1.
f
SW
Switching transistor frequency
55
65
75
KHz
V
IN
=3.3V. See Figure 1.
D
Switching transistor duty cycle
88
%
See figure 1.
Symbol
Parameter
Min
Typ
Max
Units
Conditions
V
DD
Supply voltage
1.8
6.5
V
f
EL
V
A-B
output drive frequency
60
1000
Hz
T
A
Operating temperature
-25
85
C
Recommended Operating Conditions
Symbol
Parameter
Min
Typ
Max
Units
Conditions
EN-L
Logic input low voltage
0
0.5
V
V
DD
=1.8V to 6.5V
EN-H
Logic input high voltage
V
DD
-0.5
V
DD
V
V
DD
=1.8V to 6.5V
Enable/Disable Function Table
Absolute Maximum Ratings*
Supply Voltage, V
DD
-0.5V to +7.5V
Output Voltage, V
Cs
-0.5V to +100V
Operating Temperature Range
-25 to +85C
Storage Temperature Range
-65C to +150C
MSOP-8 Power Dissipation
300mW
Note:
*All voltages are referenced to GND.
Pin Configuration
V
DD
V
A
R
SW-osc
V
B
R
EL-osc
C
S
Gnd
L
X
1
2
3
4
8
7
6
5
MSOP-8
Top View
Package Options
Device
MSOP-8
Die
HV833
HV833MG*
HV833X
* Product supplied on 2500 piece carrier tape reels.
Ordering Information
Electrical Characteristics
DC Characteristics
(Over recommended operating conditions unless otherwise specified, T
A
=25C)
Enable/Disable Table
(See Typical Application on Front Page)
R
SW
resistor
HV833
V
DD
Enable
0V
Disable
3
HV833
Block Diagram
Switch
Osc
C
+
_
Vref
Disable
Output
Osc
GND
V
DD
Q
Q
Q
V
A
C
S
L
X
V
B
Q
R
SW-OSC
R
EL-OSC
Vsen
Device
Lamp Size
V
IN
I
IN
V
CS
f
EL
Brightness
T
A
HV833MG
10 in
2
3.3V
56mA
72V
270Hz
5.0ft-lm
-25C to +85C
Typical Performance
Figure 1: Typical Application
* Lx = 220H Murata LQH43MN221K01
29nF
+
_
0.01
F
100V
1
2
3
4
8
6
5
HV833MG
7
V
IN
V
DD
R
SW-osc
R
EL-osc
Gnd
L
X
C
S
V
B
V
A
L
X
*
220
H
1N914
4.7
F
1.65M
1.0M
V
DD
Enable Signal
ON=V
DD
OFF=0
V
DD
=V
IN
=3.3V
680
Equivalent to
10in
2
lamp
4
HV833
40
50
60
70
80
90
1.0
2.0
3.0
4.0
5.0
6.0
7.0
Vin (V)
Iin vs. Vin
Vcs vs. Vin
20
30
40
50
60
1.0
2.0
3.0
4.0
5.0
6.0
7.0
Vin (V)
Brightness vs. Vin
0
1
2
3
4
5
6
1.0
2.0
3.0
4.0
5.0
6.0
7.0
Vin (V)
Iin vs. Vcs
20
30
40
50
60
40
50
60
70
80
90
Vcs (V)
Vcs (V)
Iin(mA)
Brightness (ft-lm)
Iin (mA)
Typical Performance Curves for Figure 1
(EL Lamp= 10.0 in
2
, V
IN
=V
DD
).
Iin, Vcs, Brightness vs. Inductor Value
0
10
20
30
40
50
60
70
80
100
200
300
400
500
600
700
800
900
1000
Inductor Value (
H)
0
1
2
3
4
5
6
7
8
Iin
Brightness
Vcs
Brightness (ft-lm)
Iin (mA), Vcs (V)
5
HV833
Device
Lamp Size
V
IN
I
IN
V
CS
f
EL
Brightness
T
A
HV833MG
6.0 in
2
5.0V
30mA
70V
440Hz
6.0ft-lm
-25C to +85C
Typical Performance
Figure 2: Typical Application
* Lx = 560H Murata LQH43MN561K01
+
_
0.01
F
100V
1
2
3
4
8
6
5
HV833MG
7
V
IN
V
DD
R
SW-osc
R
EL-osc
Gnd
L
X
C
S
V
B
V
A
L
X
*
560
H
1N914
4.7
F
1.0M
750K
Enable Signal
ON=V
DD
OFF=0
EL Lamp
6in
2
Figure 2: V
DD
=3V, V
IN
=5.0V
V
DD
6
HV833
Typical Performance Curves for Figure 2
(EL Lamp= 6.0 in
2
, V
DD
=3.0V).
Vcs vs. Vin
20
30
40
50
60
70
80
1.0
2.0
3.0
4.0
5.0
6.0
7.0
Vin (V)
Iin vs. Vin
Vin (V)
Brightness vs. Vin
0
2
4
6
8
10
1.0
2.0
3.0
4.0
5.0
6.0
7.0
Vin (V)
Iin vs. Vcs
10
15
20
25
30
35
20
30
40
50
60
70
80
Vcs (V)
Vcs (V)
Iin(mA)
Brightness (ft-lm)
Iin (mA)
1.0
2.0
3.0
4.0
5.0
6.0
7.0
Iin, Vcs, Brightness vs. Inductor Value
0
10
20
30
40
50
60
70
80
90
100
200
300
400
500
600
700
800
900
1000
Inductor Value (
H)
1
2
3
4
5
6
7
8
9
10
Iin
Vcs
Brightness
Brightness (ft-lm)
Iin (mA), Vcs (V)
7
HV833
Figure 3: Typical Application
+
_
0.01
F
100V
1
2
3
4
8
6
5
HV833MG
7
V
IN
=V
DD
V
DD
R
SW-osc
R
EL-osc
Gnd
L
X
C
S
V
B
V
A
L
X
*
560
H
1N914
4.7
F
1.0M
750K
Enable Signal
ON=V
DD
OFF=0
EL Lamp
3in
2
Figure 3: V
DD
= V
IN
= 3.0V
Device
Lamp Size
V
IN
I
IN
V
CS
f
EL
Brightness
T
A
HV833MG
3.0 in
2
3.0V
20mA
60V
440Hz
4.0ft-lm
-25C to +85C
Typical Performance
* Lx = 560H Murata LQH43MN561K01
8
HV833
Typical Performance Curves for Figure 3
(EL Lamp= 3.0 in
2
, V
IN
=V
DD
).
Vcs vs. Vin
30
40
50
60
70
80
90
1.0
2.0
3.0
4.0
5.0
6.0
7.0
Vin (V)
Iin vs. Vin
5
10
15
20
25
1.0
2.0
3.0
4.0
5.0
6.0
7.0
Vin (V)
Brightness vs. Vin
0
2
4
6
8
10
1.0
2.0
3.0
4.0
5.0
6.0
7.0
Vin (V)
Iin vs. Vcs
5
10
15
20
25
30
40
50
60
70
80
90
Vcs (V)
Vcs (V)
Iin(mA)
Brightness (ft-lm)
Iin (mA)
Iin, Vcs, Brightness vs. Inductor Value
0
10
20
30
40
50
60
70
80
90
100
200
300
400
500
600
700
800
900
1000
Inductor Value (H)
1
2
3
4
5
6
7
8
9
10
Iin
Vcs
Brightness
Brightness (ft-lm)
Iin (mA), Vcs (V)
9
HV833
External Component Description
External Component
Selection Guide Line
Diode
Fast reverse recovery diode, 100V 1N4148 or equivalent.
Cs Capacitor
0.003F to 0.1F, 100V capacitor to GND is used to store the energy transferred from the inductor.
R
EL-osc
The EL lamp frequency is controlled via an external R
EL
resistor connected between R
EL-osc
and V
DD
of the
device. The lamp frequency increases as R
EL
decreases. As the EL lamp frequency increases, the amount
of current drawn from the battery will increase and the output voltage V
CS
will decrease. The color of the EL
lamp is dependent upon its frequency.
R
SW-osc
The switching frequency of the converter is controlled via an external resistor, R
SW
between R
SW-osc
and V
DD
of the device. The switching frequency increases as R
SW
decreases. With a given inductor, as the switching
frequency increases, the amount of current drawn from the battery will decrease and the output voltage, V
CS
,
will also decrease.
Lx Inductor
The inductor L
x
is used to boost the low input voltage by inductive flyback. When the internal switch is on,
the inductor is being charged. When the internal switch is off, the charge stored in the inductor will be
transferred to the high voltage capacitor C
S
. The energy stored in the capacitor is connected to the internal
H-bridge and therefore to the EL lamp. In general, smaller value inductors, which can handle more current,
are more suitable to drive larger size lamps. As the inductor value decreases, the switching frequency of the
inductor (controlled by R
SW
) should be increased to avoid saturation.
220H Murata (LQH43MN221) inductors with 5.4 series DC resistance is typically recommended. For
inductors with thesame inductance value but with lower series DC resistance, lower R
SW
value is needed to
prevent high current draw and inductor saturation.
Lamp
As the EL lamp size increases, more current will be drawn from the battery to maintain high voltage across
the EL lamp. The input power, (V
IN
x I
IN
), will also increase. If the input power is greater than the power
dissipation of the package (300mW), an external resistor in series with one side of the lamp is recommended
to help reduce the package power dissipation.
Enable/Disable Configuration
The HV833 can be easily enabled and disabled via a logic control
signal on the R
SW
and R
EL
resistors as shown in the Typical
Application Circuit on the front page. The control signal can be
from a microprocessor. R
SW
and R
EL
are typically very high
values. Therefore, only 10's of microamperes will be drawn from
the logic signal when it is at a logic high (enable) state. When
the microprocessor signal is high the device is enabled and when
the signal is low, it is disabled.
Split Supply Configuration for Battery
Voltages of Higher than 6.5V
The Typical Application Circuit on the first page can also be used
with high battery voltages such as 12V as long as the input
voltage, V
DD
, to the HV833 device is within its specifications of
1.8V to 6.5V.
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 744-0100 FAX: (408) 222-4895
www.supertex.com
05/02/02rev.8
2002 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.