Supertex inc.
High Voltage
EL Lamp Driver
Features
►
1.8 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
HV833
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
1.8 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 a resistor between the RSW-Osc pin and the VDD/GND
pins.
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 RSW-Osc pin
and the VDD supply pin. The EL lamp driver frequency is set by an
external resistor connected between the REL-Osc pin and the VDD
pin. An external inductor is connected between the LX pin and VDD
or VIN pin. A 0.003-0.1µF capacitor is connected between the CS pin
and the GND pin. 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 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 VA and VB
are configured as an H bridge and are switching in opposite states to
achieve 180V peak-to-peak across the EL lamp.
General Description
Applications
►
►
►
►
►
Portable transceivers
Remote control units
Calculators
PDAs
Global Positioning Systems (GPS)
Typical Application Circuit
ON = V
DD
OFF = 0
V
DD
Enable Signal
1
2
3
VDD
RSW-Osc
REL-Osc
GND
VA
VB
CS
LX
8
7
6
5
EL Lamp
+
V
IN
_
4
1N914
L
X
C
S
100V
HV833
Doc.# DSFP-HV833
A061813
Supertex inc.
www.supertex.com
HV833
Ordering Information
Part Number
HV833MG-G
Package
8-Lead MSOP
Packing
2500/Reel
Pin Configuration
VDD
RSW-Osc
REL-Osc
1
2
3
4
8
7
6
5
VA
VB
CS
LX
-G denotes a lead (Pb)-free / RoHS compliant package
Absolute Maximum Ratings
Parameter
Supply voltage V
DD
Output voltage, V
CS
Operating temperature
Storage temperature
Power dissipation
Value
-0.5V to 7.5V
-0.5V to 125V
-40°C to +85°C
-65°C to +150°C
300mW
GND
8-Lead MSOP
(top view)
Product Marking
Top Marking
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.
H833
LLLL
Bottom Marking
Typical Thermal Resistance
Package
8-Lead MSOP
θ
ja
216
O
C/W
YYWW
L = Lot Number
YY = Year Sealed
WW = Week Sealed
= “Green” Packaging
Package may or may not include the following marks: Si or
8-Lead MSOP
Recommended Operating Conditions
Sym
V
DD
f
EL
T
A
Parameter
Supply voltage
V
A-B
output drive frequency
Operating temperature
Min
1.8
60
-25
Typ
-
-
-
Max
6.5
1000
+85
Units
V
Hz
°C
Conditions
---
---
---
DC Electrical Characteristics
(Over recommended operating conditions unless otherwise specified, T
Sym
R
DS(ON)
V
CS
V
A-B
I
DDQ
I
DD
I
IN
V
CS
f
EL
F
SW
D
Parameter
On-resistance of switching transistor
Max. output regulation voltage
Max differential output voltage across lamp
Quiescent V
DD
supply current
Input current going into the VDD pin
Input current including inductor current
Output voltage on V
CS
V
DIFF
output drive frequency
Switching transistor frequency
Switching transistor duty cycle
Min
-
80
160
-
-
-
63
240
55
-
Typ
-
90
180
-
-
56
72
270
65
88
Max
4.0
100
200
100
150
64
81
300
75
-
Units
Ω
V
V
nA
µA
mA
V
Hz
kHz
%
A
= 25°C)
Conditions
I = 100mA
V
DD
= 1.8 to 6.5V
V
DD
= 1.8 to 6.5V
R
SW-Osc
= Low
V
DD
= 1.8 to 6.5V. See Fig. 1
V
IN
= 3.3V. See Fig. 1.
V
IN
= 3.3V. See Fig. 1.
V
IN
= 3.3V. See Fig. 1.
V
IN
= 3.3V. See Fig. 1.
See Fig. 1.
Doc.# DSFP-HV833
A061813
2
Supertex inc.
www.supertex.com
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