HV832
High Voltage Dual EL Lamp Driver
for Low Noise Applications
Patented audible noise reduction
Patented lamp aging compensation
210 V
PP
output voltage for higher brightness
Patented output timing for high efficiency
Single cell lithium ion compatible
150nA shutdown current
Wide input voltage range 1.8V to 5.0V
Separately adjustable lamp and converter
frequencies
►
Output voltage regulation
►
Split supply capability
►
►
►
►
►
►
►
►
The Supertex HV832 is a high voltage driver designed for driving two
EL lamps with a combined area of 3.5in
2
. The input supply voltage
range is from 2.0V to 5.0V. The device is designed to reduce the
amount of audible noise emitted by the lamp. It 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 HV832 has an internal oscillator, a switching MOSFET, and
two high voltage EL lamp drivers. The frequency for the switching
MOSFET is set at 51KHz nominal. The EL lamp driver frequency is
set by dividing the MOSFET switching frequency by 128. An external
inductor is connected between the LX and VDD or VIN pins for split
supply applications. A 0.001 to 0.01µF, 100V capacitor is connected
between the CS pin and Ground. The EL lamps are connected
between EL1 to Com and EL2 to Com.
An input control pin is available to select various modes of the device.
Each logic pulse applied to the control pin will cause the device to
change to the next mode. The sequence for the modes is: (1) EL1 on
only, (2) EL2 on only, (3) both EL1 and EL2 on, and (4) device shuts
down. During power up of the device, the mode will default to shut
down.
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 EL1 to Com
and EL2 to Com are configured as H bridges EL1/EL2 and Com
and are switching in opposite states to achieve 180V across the EL
lamp.
Applications
►
►
►
►
►
O
Typical Application Circuit
V
DD
EL Lamp 1
1
2
3
4
Logic Input Pulse
bs
+
_
C
IN
LCD backlighting
Mobile Cellular Phone keypads
PDAs
Handheld wireless communication products
Global Positioning Systems (GPS)
ol
EL1
VDD
Control
GND
EL2
8
V
IN
HV832MG
et
e
Com
7
CS
6
Features
General Description
EL Lamp 2
LX
5
L
X
C
S
HV832
Ordering Information
Device
HV832
Package Options
MSOP-8
1
HV832MG
HV832MG-G
-G indicates package is RoHS compliant (‘Green’)
Absolute Maximum Ratings
Parameter
Supply voltage V
DD
Output voltage, V
CS
Operating Temperature
Storage Temperature
Power Dissipation MSOP-8
Value
-0.5V to 7.5V
-0.5V to 125V
-40°C to +85°C
-65°C to +150°C
300mW
Absolute Maximum Ratings are those values beyond which damage to the device may
occur. Functional operation under these conditions is not implied. Continuous operation
of the device at the absolute rating level may affect device reliability. All voltages are
referenced to device ground.
Recommended Operating Conditions
Sym
V
DD
T
A
Parameter
Supply voltage
Operating Temperature
ol
Min
2.0
-40
Typ
-
-
bs
-
80
160
-
-
-
-
68
62
350
-
85
-
-
0
175
DC Electrical Characteristics
(Over recommended operating conditions unless otherwise specified V
Sym
R
DS(ON)
V
CS
V
DIFF
I
DDQ
I
DD
I
IN
Parameter
Min
Typ
-
90
180
-
-
27
38
78
70
400
51.2
-
-
-
-
-
-
On-resistance of switching
transistor
Max. output regulation voltage
Peak to Peak output voltage
Quiescent V
DD
supply current
Input current going into the V
DD
pin
Input current including inductor
current
Output voltage on V
CS
V
DIFF
output drive frequency
Switching transistor frequency drift
Switching transistor duty cycle
Input logic low current going into
the control pin.
Input logic high current going into
the control pin.
Logic input low voltage
Logic input high voltage
O
V
CS
f
EL
Fsw
F
SW DRIFT
D
I
IL
I
IH
V
IL
V
IH
Switching transistor frequency
44.8
* The inductor used is a 220µH Murata inductor, max DC resistance of 8.4Ω, part # LQH32CN221K21.
2
et
e
Pin Configuration
EL1
1
2
3
4
8
7
6
5
EL2
Com
VDD
Control
CS
LX
GND
HV832
(Top View)
Max
5.0
+85
Units
V
°C
Conditions
---
---
IN
= V
DD
= 3.3V, T
A
=25°C)
Max
6.0
100
200
150
150
32
43
87
78
450
57.6
±5.0
-
0.6
Units
Ω
V
V
nA
µA
mA
Conditions
I = 100mA
V
DD
= 2.0V to 5.0V
V
DD
= 2.0V to 5.0V
---
V
DD
= 2.0V to 5.0V.
V
IN
= 3.0V. Driving EL
1
or EL
2
. See Fig1.*
V
IN
= 3.0V. Driving both EL
1
and EL
2
. See Fig1.*
V
IN
= 3.0V. Driving EL
1
or EL
2
. See Fig1.*
V
IN
= 3.0V. Driving both EL
1
and EL
2
. See Fig1.*
V
IN
= 3.0V. See Fig1.*
V
IN
= 3.0V. See Fig1.*
T
A
= -40°C to +85°C
See Fig 1.
V
Hz
kHz
kHz
%
µA
0.6
0.25
V
DD
V
V
V
DD
= 2.0V to 5.0V. See Fig 1.
---
---
HV832
Functional Block Diagram
V
DD
Control
L
X
C
S
Control Logic &
Switch Osc
GND
Disable
+
C
_
V
REF
EL Osc =
Switch Osc 128
ol
Function Table
Control Pin
Power up
bs
EL1
HI-Z
ON
HI-Z
ON
HI-Z
Lamp
EL
1
or EL
2
ON
Both EL
1
and EL
2
ON
V
DD
3.0V
EL2
HI-Z
HI-Z
ON
ON
HI-Z
O
1
ST
pulse L to H
2
ND
pulse L to H
4
TH
pulse L to H
3
RD
pulse L to H
Typical Performance
Device
HV832MG
I
DD
27mA
38mA
V
CS
78V
70V
f
EL
400Hz
Brightness
7.5ft-Im
6.2ft-Im
3
et
e
V
SEN
EL
1
High
Voltage
Level
Trans-
lator
EL
2
Com
Com
HI-Z
ON
ON
ON
HI-Z
IC
OFF
ON
ON
ON
OFF
HV832
Figure 1: Typical Application/Test Circuit
V
DD
Logic Input Pulse
1
2
3
4
V
DD
= V
IN
EL1
VDD
Control
GND
EL2
8
EL Lamp 1 = 1.5in
2
EL Lamp 2 = 1.5in
2
Com
7
CS
V
IN
+
_
4.7µF
HV832MG
L
X
= 330µH Murata (LQH32CN331)
* any (equivalent or better) >90V, fast reverse recovery diode
Typical Performance Curves for FIg. 1
(one output on, EL Lamp = 1.5in
2
, V
DD
= 3.0V)
90
80
70
I
IN
(mA), V
CS
(V)
ol
300
400
Inductor Value (H)
500
30
28
I
IN
,
V
CS
,
Brightness vs. Inductor Value
V
CS
60
50
40
30
20
10
8
bs
0
200
Brightness
7
I
IN
6
5
600
V
CS
vs V
IN
I
IN
vs V
IN
100
90
80
70
60
50
O
V
CS
(V)
I
IN
(mA)
26
24
22
20
1.5
2
2.5
3
3.5
4
4.5
5
5.5
1.5
2.5
Brightness (ft-lm)
3.5
et
e
6
IN914*
LX
5
L
X
330µH
3.3nF
100V
10
9
4.5
5.5
V
IN
(V)
V
IN
(V)
Brightness (ft-lm)
10
9
8
7
6
5
4
1.5
2.5
Brightness vs V
CS
30
28
I
IN
vs V
CS
I
IN
(mA)
3.5
4.5
5.5
26
24
22
20
60
65
70
75
80
85
90
95
V
IN
(V)
V
CS
(V)
4
HV832
Split Supply Configuration
The HV832 can also be used for handheld devices operat-
ing from a battery where a regulated voltage is available.
This is shown in Fig. 2. The regulated voltage can be used
to run the internal logic of the HV832. The amount of current
necessary to run the internal logic is 150µA Max at a V
DD
of
3.0V. Therefore, the regulated voltage could easily provide
the current without being loaded down.
Fig. 2: Split Supply
Regulated Voltage = V
DD
Logic Input Pulse
1
2
3
4
External Component Description
External Component
Diode
C
S
Capacitor
Selection Guide Line
Lx Inductor
Lamp
O
bs
Fast reverse recovery diode, IN914 diode or equivalent.
0.003µF to 0.1µF, 200V capacitor to GND is used to store the energy transferred from the 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 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.
ol
5
+
Battery Voltage = V
IN
_
C
IN
et
e
EL Lamp 1
EL1
EL2
8
EL Lamp 2
VDD
Com
7
CS
Control
GND
6
LX
5
HV832MG
L
X
C
S
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