Page 1
Demo Kit
p
_
386
5
833MG
S
c
sc
d
C
S
l
914
Cs
00V
Available
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
Applications
❏ Portable Transceivers
❏ Remote Control Units
❏ Calculators
❏ PDAs
❏ Global Positioning Systems (GPS)
General Description
The Supertex HV833 is a high voltage driver designed for driving
EL lamps of up to 35nF (10-12in
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
to VDD/ground.
R
SW-OSC
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
driver frequency is set by an external resistor connected between
pin and the VDD pin. An external inductor is connected
R
EL-osc
between the LX and VDD or VIN pins. A 0.003-0.1µF capacitor is
connected between C
between VA and VB.
The switching MOSFET charges the external inductor and
discharges it into the capacitor at CS. The voltage at CS will start
to increase. Once the voltage at CS reaches a nominal value of
90V, the switching MOSFET is turned OFF to conserve power.
The outputs V
switching in opposite states to achieve 180V peak-to-peak
across the EL lamp.
pin and the supply pin VDD. The EL lamp
SW-osc
and ground. The EL lamp is connected
S
and VB are configured as an H bridge and are
A
2
). The input supply voltage
Typical Application
ON=V
DD
OFF=0
V
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.
Enable Signa
EL Lam
W-os
EL-o
1N
n
HV
1
1
Page 2
HV833
Ordering Information
Pin Configuration
Package Options
Device MSOP-8 Die
HV833 HV833MG* HV833X
* Product supplied on 2500 piece carrier tape reels.
Absolute Maximum Ratings*
Supply Voltage, V
Output Voltage, V
DD
Cs
-0.5V to +7.5V
-0.5V to +100V
ςΑ
R
SW-osc
R
EL-osc
1
V
DD
2
MSOP-8
3
Gnd L
4
8
7
6
5
Top View
Operating Temperature Range -25° to +85°C
Storage Temperature Range -65°C to +150°C
MSOP-8 Power Dissipation 300mW
Note:
*All voltages are referenced to GND.
Enable/Disable Table
(See Typical Application on Front Page)
RSW resistor HV833
V
DD
Enable
0V Disable
Electrical Characteristics
DC Characteristics (Over recommended operating conditions unless otherwise specified, T
Symbol Parameter Min Typ Max Units Conditions
R
DS(on)
V
Cs
V
A-B
I
DDQ
I
DD
I
IN
V
CS
f
EL
f
SW
D Switching transistor duty cycle 88 % See figure 1.
On-resistance of switching transistor 4.0 Ω I=100mA
Max. output regulation voltage 80 90 100 V VDD=1.8V to 6.5V
Max. of differential output voltage
across lamp
160 180 200 V VDD=1.8V to 6.5V
Quiescent VDD supply current 100 nA R
Input current going into the VDD pin 150 µAVDD=1.8V to 6.5V. See Figure 1.
Input current including inductor current 56 64 mA VIN=3.3V. See Figure 1.
Output voltage on V
V
output drive frequency 240 270 300 Hz VIN=3.3V. See Figure 1.
A-B
CS
63 72 81 V VIN=3.3V. See Figure 1.
Switching transistor frequency 55 65 75 KHz VIN=3.3V. See Figure 1.
SW-osc
=25°C)
A
= Low
V
A
V
B
C
S
X
Recommended Operating Conditions
Symbol Parameter Min Typ Max Units Conditions
V
DD
f
EL
T
A
Supply voltage 1.8 6.5 V
V
output drive frequency 60 1000 Hz
A-B
Operating temperature -25 85 °C
Enable/Disable Function Table
Symbol Parameter Min Typ Max Units Conditions
EN-L Logic input low voltage 0 0.5 V VDD=1.8V to 6.5V
EN-H Logic input high voltage VDD-0.5 V
2
DD
VVDD=1.8V to 6.5V
Page 3
Block Diagram
S
h
Osc
C
_
ef
sable
t
Osc
GND
Q
Q
Q
C
S
Q
SW-OSC
sen
V
HV833
R
R
EL-OSC
witc
Di
Figure 1: Typical Application
ON=V
DD
OFF=0
V
+
V
IN
_
Enable Signal
DD
1.0M
1.65M
Vr
V
DD=VIN
V
1
DD
R
2
SW-osc
R
3
EL-osc
Gnd L
4
V
=3.3V
Outpu
Equivalent to
2
10in
lamp
680Ω
8
V
A
29nF
V
7
B
C
6
S
1N914
5
X
4.7µF
HV833MG
LX*
220µH
0.01µF
100V
* Lx = 220µH Murata LQH43MN221K01
Typical Performance
Device Lamp Size V
HV833MG 10 in
2
IN
3.3V 56mA 72V 270Hz 5.0ft-lm -25°C to +85°C
I
IN
V
CS
f
EL
Brightness T
A
3
Page 4
HV833
Typical Performance Curves for Figure 1 (EL Lamp= 10.0 in
90
80
70
60
Vcs (V)
50
40
1.0 2.0 3.0 4.0 5.0 6.0 7.0
Vin (V)
Brightness vs. Vin
6
5
4
3
2
1
Brightness (ft-lm)
0
1.0 2.0 3.0 4.0 5.0 6.0 7.0
Vin (V)
60
50
40
Iin(mA)
30
20
1.0 2.0 3.0 4.0 5.0 6.0 7.0
60
50
40
Iin (mA)
30
20
40 50 60 70 80 90
2
, VIN=VDD).
Iin vs. VinVcs vs. Vin
Vin (V)
Iin vs. Vcs
Vcs (V)
Iin, Vcs, Brightness vs. Inductor Value
80
70
60
Vcs
50
40
30
Iin (mA), Vcs (V)
Iin
20
Brightness
10
0
100 200 300 400 500 600 700 800 900 1000
Inductor Value (µH)
8
7
6
5
4
3
Brightness (ft-lm)
2
1
0
4
Page 5
Figure 2: Typical Application
_
0.01
µ
00V
386
5
833MG
S
c
sc
Gnd
C
S
560
µ
4
µ
0M
50K
l
p
6in
HV833
Figure 2: VDD=3V, VIN=5.0V
ON=V
DD
Enable Signa
OFF=0
7
1.
* Lx = 560µH Murata LQH43MN561K01
Typical Performance
Device Lamp Size V
HV833MG 6.0 in
2
IN
5.0V 30mA 70V 440Hz 6.0ft-lm -25°C to +85°C
EL Lam
W-os
EL-o
1N91
HV
1
I
IN
V
CS
f
EL
Brightness T
A
5
Page 6
HV833
Typical Performance Curves for Figure 2 (EL Lamp= 6.0 in
80
70
60
50
40
Vcs (V)
30
20
1.0 2.0 3.0 4.0 5.0 6.0 7.0
10
8
6
4
2
Brightness (ft-lm)
0
1.0 2.0 3.0 4.0 5.0 6.0 7.0
Vcs vs. Vin
Vin (V)
Brightness vs. Vin
Vin (V)
Iin(mA)
1.0 2.0 3.0 4.0 5.0 6.0 7.0
35
30
25
20
Iin (mA)
15
10
20 30 40 50 60 70 80
2
, V
DD«
Iin vs. Vin
Vin (V)
Iin vs. Vcs
Vcs (V)
=3.0V).
Iin, Vcs, Brightness vs. Inductor Value
90
80
70
60
50
40
30
Iin (mA), Vcs (V)
20
10
0
100 200 300 400 500 600 700 800 900 1000
Iin
Inductor Value (µH)
Vcs
Brightness
10
9
8
7
6
5
4
Brightness (ft-lm)
3
2
1
6
Page 7
Figure 3: Typical Application
_
0.01
µ
00V
386
5
833MG
S
c
sc
Gnd
C
S
560
µ
4
µ
0M
50K
ON=V
O
0
p
3in
HV833
Enable Signal
FF=
VIN=
* Lx = 560µH Murata LQH43MN561K01
Typical Performance
Device Lamp Size V
HV833MG 3.0 in
2
IN
3.0V 20mA 60V 440Hz 4.0ft-lm -25°C to +85°C
Figure 3: V
7
1.
W-os
EL-o
DD
= V
IN
= 3.0V
EL Lam
1N91
HV
1
I
IN
V
CS
f
EL
Brightness T
A
7
Page 8
HV833
Typical Performance Curves for Figure 3 (EL Lamp= 3.0 in
90
80
70
60
Vcs (V)
50
40
30
1.0 2.0 3.0 4.0 5.0 6.0 7.0
10
8
6
4
2
Brightness (ft-lm)
0
1.0 2.0 3.0 4.0 5.0 6.0 7.0
Vcs vs. Vin
Vin (V)
Brightness vs. Vin
Vin (V)
25
20
15
Iin(mA)
10
5
1.0 2.0 3.0 4.0 5.0 6.0 7.0
25
20
15
Iin (mA)
10
5
30 40 50 60 70 80 90
2
, VIN=VDD).
Iin vs. Vin
Vin (V)
Iin vs. Vcs
Vcs (V)
Iin, Vcs, Brightness vs. Inductor Value
90
80
70
60
Vcs
50
40
Iin (mA), Vcs (V)
Brightness
30
20
Iin
10
0
100 200 300 400 500 600 700 800 900 1000
Inductor Value (µH)
10
9
8
7
6
5
Brightness (ft-lm)
4
3
2
1
8
Page 9
External Component Description
External Component Selection Guide Line
Diode Fast reverse recovery diode, 100V 1N4148 or equivalent.
Cs Capacitor 0.003µF to 0.1µF, 100V capacitor to GND is used to store the energy transferred from the inductor.
HV833
R
R
EL-osc
SW-osc
The EL lamp frequency is controlled via an external REL resistor connected between R
device. The lamp frequency increases as R
of current drawn from the battery will increase and the output voltage V
lamp is dependent upon its frequency.
decreases. As the EL lamp frequency increases, the amount
EL
will decrease. The color of the EL
CS
and VDD of the
EL-osc
The switching frequency of the converter is controlled via an external resistor, RSW between R
SW-osc
and V
of the device. The switching frequency increases as RSW decreases. With a given inductor, as the switching
frequency increases, the amount of current drawn from the battery will decrease and the output voltage, VCS,
will also decrease.
Lx Inductor The inductor Lx 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
H-bridge and therefore to the EL lamp. In general, smaller value inductors, which can handle more current,
. The energy stored in the capacitor is connected to the internal
S
are more suitable to drive larger size lamps. As the inductor value decreases, the switching frequency of the
inductor (controlled by R
) should be increased to avoid saturation.
SW
220µH Murata (LQH43MN221) inductors with 5.4Ω series DC resistance is typically recommended. For
inductors with thesame inductance value but with lower series DC resistance, lower RSW 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
dissipation of the package (300mW), an external resistor in series with one side of the lamp is recommended
x IIN), will also increase. If the input power is greater than the power
IN
to help reduce the package power dissipation.
DD
Enable/Disable Configuration
The HV833 can be easily enabled and disabled via a logic control
signal on the RSW and REL resistors as shown in the Typical
Application Circuit on the front page. The control signal can be
from a microprocessor. R
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.
and REL are typically very high
SW
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
1.8V to 6.5V.
, to the HV833 device is within its specifications of
DD
©2002 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
05/02/02rev.8
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 744-0100 • FAX: (408) 222-4895
9
www.supertex.com
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