HV826
High Voltage
EL Lamp Driver IC
Features
►
►
►
►
►
►
1.8 to 3.5V operating supply voltage
DC to AC conversion
Output voltage regulation
Adjustable output lamp frequency
Adjustable converter frequency
Enable/disable function
General Description
The Supertex HV826 is a high voltage driver designed for
driving EL lamps. The input supply voltage range is from 1.8V
to 3.5V. 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 ±80V. The chip can be
enabled/disabled by connecting the resistor on the RSW-Osc
pin to VDD/GND.
The HV826 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 RSW-Osc pin and the VDD supply pin. The EL
lamp driver frequency is set by an external resistor connected
between REL-Osc pin and the VDD pin. An external inductor
is connected between the LX pin and VDD pin. A 0.01-0.1µF
capacitor is connected between the CS pin and GND. The EL
lamp is connected between the VA pin and the VB pin.
The switching MOSFET charges the external inductor and
discharges it into the capacitor at the CS pin. The voltage at
CS will start to increase. Once the voltage at CS reaches a
nominal value of 80V, the switching MOSFET is turned OFF
to conserve power. The output pins VA and VB are configured
as an H bridge and are switching in opposite states to achieve
160V peak-to-peak across the EL lamp.
Applications
►
►
►
►
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Pagers
Portable Transceiver
Cellular phones
Remote control units
Calculators
HV826 Block Diagram
VDD
RSW-Osc
Switch
Osc
LX
CS
Q
GND
Disable
+
C
_
V
SEN
V
REF
VA
Q
Output
Osc
Q
REL-Osc
Q
VB
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
HV826
Ordering Information
Package Options
Device
4.90x3.90mm body
1.75mm height (max)
1.27mm pitch
Pin Configuration
VDD
RSW-Osc
REL-Osc
GND
1
2
3
4
8
7
6
5
VA
VB
CS
8-Lead SOIC
3.00x3.00mm body
1.10mm height (max)
0.65mm pitch
8-Lead MSOP
HV826
HV826LG-G
HV826MG-G
LX
-G indicates package is RoHS compliant (‘Green’)
8-Lead SOIC (LG) / 8-Lead MSOP (MG)
(top view)
Product Marking
Absolute Maximum Ratings
Parameter
Supply voltage, V
DD
Output voltage, V
CS
Operating temperature range
Storage temperature range
8-Lead SOIC power dissipation
8-Lead MSOP power dissipation
Value
-0.5V to +4.5V
-0.5V to +100V
-25°C to +85°C
-65°C to +150°C
400mW
300mW
HV826
YWW
LLLL
Y = Last Digit of Year Sealed
WW = Week Sealed
L = Lot Number
= “Green” Packaging
Package may or may not include the following marks: Si or
8-Lead SOIC (LG)
Top Marking
H826
LLLL
Bottom Marking
YYWW
L = Lot Number
YY = Year Sealed
WW = Week Sealed
= “Green” Packaging
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
GND.
Package may or may not include the following marks: Si or
Electrical Characteristics
Sym
R
DS(ON)
I
IN
I
DDQ
V
CS
V
A-B
f
EL
f
SW
D
Parameter
8-Lead MSOP (MG)
- T
A
= 25°C)
DC Characteristics
(Over recommended operating conditions unless otherwise specified
Min
-
-
-
75
150
300
-
-
Typ
-
35
-
80
160
375
80
88
On-resistance of switching transistor
V
DD
supply current (including inductor current)
Quiescent V
DD
supply current
Output voltage on CS
Differential output voltage across lamp
V
A-B
output drive frequency
Switching transistor frequency
Switching transistor duty cycle
Max
6.0
45
100
85
170
450
-
-
Units
Ω
mA
nA
V
V
Hz
kHz
%
Conditions
I = 100mA
V
IN
= 1.5V. See Fig.1
RSW-Osc = low
V
DD
= 1.8 - 3.5V
V
DD
= 1.8 - 3.5V
V
IN
= 1.5V. See Fig.1
V
IN
= 1.5V. See Fig.1
See Fig.1
Recommended Operating Conditions
V
DD
f
EL
T
A
Supply voltage
V
A-B
output drive frequency
Operating temperature
1.8
60
-25
-
-
-
3.5
1000
+85
V
Hz
O
---
---
---
C
Enable/Disable Function Table
EN-L
EN-H
Logic input low voltage
Logic input high voltage
0
V
DD
-0.5
-
-
0.5
V
DD
V
V
V
DD
= 1.8 - 3.5V
V
DD
= 1.8 - 3.5V
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
2
HV826
Fig.1: Typical Application
ON = V
DD
OFF = 0
Enable Signal
V
DD
= 3.0V
560kΩ
2 RSW-Osc
+
V
IN
_
1.0MΩ
3
4
REL-Osc
GND
1
VDD
VA
VB
CS
LX
8
7
6
5
1N4148
L
X
*
220µH
0.1µF
100V
EL Lamp
4.7µF
HV826
Typical Performance
Lamp Size
1.6in
2
V
IN
1.5V
I
IN
35mA
V
CS
66V
f
EL
345Hz
Brightness
5.00ft-lm
Notes:
* Murata part # LQH4N221K04 (DC resistance < 14.5Ω)
Typical Performance Curves for Fig.1
(1.6in
2
Lamp)
100
80
60
40
20
0
V
CS
vs V
IN
I
IN
(mA)
40
30
20
10
0
1
2
I
IN
vs V
IN
V
CS
(V)
1
2
V
IN
(V)
3
4
V
IN
(V)
3
4
Brightness (ft-lm)
6
4
2
0
1
Brightness vs V
IN
I
IN
(mA)
40
30
20
10
0
60
70
I
IN
vs V
CS
2
V
IN
(V)
3
4
V
CS
(V)
6.0
5.0
4.0
80
90
I
IN
, V
CS
, Brightness vs Inductor Value
90
80
70
V
DD
= 3.0V, V
IN
= 1.5V
Brightness (ft-lm)
60
50
40
30
20
10
0
I
IN
(mA)
V
CS
(V)
3.0
2.0
1.0
100
220
330
Inductor Value (µH)
560
900
0.0
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
3
Brightness (ft-lm)
I
IN
(mA), V
CS
(V)
HV826
Fig.2: Typical Application
(V
ON = V
DD
OFF = 0
IN
= 3.0V = V
DD
)
2.0KΩ
VA
VB
CS
LX
8
7
6
5
Equivalent to
3in
2
lamp
10nF
Enable Signal
1
VDD
RSW-Osc
REL-Osc
GND
750K
V
IN
= V
DD
+
_
2
4.7µF
2.0M
3
4
1N4148
L
X
*
560µH
HV826
0.1µF
100V
Typical Performance
Lamp Size
3.0in
2
Notes:
* Murata part # LQH4N561K04
V
IN
3.0V
I
DD
23mA
V
CS
80V
f
EL
195Hz
Brightness
4.0ft-lm
Typical Performance Curves for Fig.2
(3.0in
2
Lamp)
100
80
60
40
20
0
V
CS
vs V
IN
I
IN
(mA)
V
CS
(V)
25
20
15
10
5
0
1
2
I
IN
vs V
IN
1
2
V
IN
(V)
3
4
V
IN
(V)
3
4
Brightness (ft-lm)
I
IN
(mA)
5
4
3
2
1
0
1
Brightness vs V
IN
25
20
15
10
5
0
50
60
I
IN
vs V
CS
2
V
IN
(V)
3
4
V
CS
(V)
5.0
4.0
3.0
2.0
70
80
90
90
80
70
60
50
40
30
20
10
0
I
IN
, V
CS
, Brightness vs Inductor Value
Brightness (ft-lm)
V
CS
(V)
I
IN
(mA), V
CS
(V)
I
IN
(mA)
1.0
0.0
100
330
470
Inductor Value (µH)
560
900
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
4
Brightness (ft-lm)
HV826
8-Lead SOIC (Narrow Body) Package Outline (LG)
4.90x3.90mm body, 1.75mm height (max), 1.27mm pitch
D
8
E
E1
Note 1
(Index Area
D/2 x E1/2)
L2
Gauge
Plane
θ1
1
L
L1
θ
Seating
Plane
Top View
A
Note 1
View B
View B
h
Seating
Plane
h
A A2
A1
e
b
Side View
A
View A-A
Note:
1. This chamfer feature is optional. A Pin 1 identifier must be located in the index area indicated. The Pin 1 identifier can be: a molded mark/identifier;
an embedded metal marker; or a printed indicator.
Symbol
A
A1
A2
b
D
E
E1
e
h
L
L1
L2
θ
θ1
Dimension
(mm)
MIN
NOM
MAX
1.35*
-
1.75
0.10
-
0.25
1.25
-
1.65*
0.31
-
0.51
4.80* 5.80* 3.80*
4.90
6.00
3.90
5.00* 6.20* 4.00*
1.27
BSC
0.25
-
0.50
0.40
-
1.27
1.04
REF
0.25
BSC
0
O
-
8
O
5
O
-
15
O
JEDEC Registration MS-012, Variation AA, Issue E, Sept. 2005.
* This dimension is not specified in the JEDEC drawing.
Drawings are not to scale.
Supertex Doc. #:
DSPD-8SOLGTG, Version I041309.
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
5
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