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PDF SP4424UEB Data sheet ( Hoja de datos )
| Número de pieza | SP4424UEB | |
| Descripción | Electroluminescent Lamp Driver Dual Oscillators | |
| Fabricantes | Sipex | |
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® SP4424
Electroluminescent Lamp Driver
Dual Oscillators
s DC to AC Inverter for EL Backlit
Display Panels
s 2.2V - 5.0V Battery Operation
s Dual Oscillator Operation for
Application Flexibility
s Low Current Standby Mode
APPLICATIONS
s PDAs
s Cellular Phones
s Remote Controls
s Hand Held Computers
DESCRIPTION
The SP4424 is a high voltage output DC-AC converter that can operate from a single battery
supply voltage as low as 2.2V. The SP4424 is capable of supplying up to 220 VPP signals,
making it ideal for driving electroluminescent lamps. The device features 5µA (maximum)
standby current, for use in low power portable products. An inductor is used to generate high
voltage pulses, and two external capacitors are used to select the inductor and the lamp
oscillator frequencies. The SP4424 is offered in both an 8-pin narrow SOIC and 8-pin micro
SOIC packages. For delivery in die form, please consult the factory.
CCOIL 1
VSS 2
COIL 3
EL1 4
SP4424
8 CLAMP
7 HON
6 VDD
5 EL2
SP4424 Block Diagram
SP4424DS/16
SP4424 Electroluminescent Lamp Driver
1
© Copyright 2000 Sipex Corporation
1 page  
CIRCUIT LAYOUT CONSIDERATIONS:
The SP4424 IC incorporates two independent
asynchronous oscillators, one of which supplies
the signal for switching of the coil transistor which
generates the coil charge pulses and the other
supplies the clock signal to switch the high voltage
H-bridge output circuit.
It is necessary to keep all high voltage signals
away from these oscillator clock signals as much
as possible as crosstalk between the two signals
can cause distortion in the EL drive signal which
can result in either low light output or blinking of
the EL lamp. It is always recommended that a low
ESR decoupling capacitor (0.1 µF or >) be used
between the VDD (pin 6) and ground (pin 2). The
VSS (gnd) pin should in turn be connected to the
system ground plane. If it is connected via a
circuit trace, this trace should be as short and as
wide as possible.
Electroluminescent Technology
What is electroluminescence?
An EL lamp is basically a strip of plastic that is
coated with a phosphorous material which emits
light (fluoresces) when a high voltage (>40V)
which was first applied across it, is removed. Long
periods of DC voltages applied to the material
tend to breakdown the material and reduce its
lifetime. With these considerations in mind, the
ideal signal to drive an EL lamp is a high voltage
sine wave. Traditional approaches to achieving
this type of waveform included discrete circuits
incorporating a transformer, transistors, and several
resistors and capacitors. This approach is large,
power hungry, expensive and bulky, and would be
difficult to implemented in most hand held
equipment.
Sipex now offers low power single chip driver
circuits specifically designed to drive small to
medium sized electroluminescent panels. All that
is required is one external inductor and capacitor.
Electroluminescent backlighting is ideal for use
with LCD displays, keypads, or other backlit
readouts. Its primary use is to illuminate displays
in dim to dark conditions for momentary periods
of time. EL lamps typically consume less current
than LEDs or bulbs making them ideal for battery
powered products. Also, EL lamps are able to
evenly light an area without creating "hot spots" in
the display.
The amount of light emitted is a function of the
voltage level applied to the lamp, the frequency at
which it is applied and the lamp size and method of
construction . There are many variables which can
be optimized for specific applications. Sipex
supplies custom characterization data to aid the
designer in selecting the optimum circuit
configuration.
SP4424DS/16
SP4424 Electroluminescent Lamp Driver
5
© Copyright 2000 Sipex Corporation
5 Page 
8-pin NSOIC
All package dimensions in inches
8-pin µSOIC
0.150/0.157 SP4424CN
1
0.189/0.197
0.228/0.244
0.053/0.069
0.0965
±0.003
0.014/0.019
0.050 BSC
0.020
0.020
0.0256
BSC
SP4424CU
12
0.012
±0.003
12.0˚
±4˚
0.118
±0.002
R .003
0.16
±0.003
0.008
0˚ - 6˚
0.006
±0.006
0.006
±0.006
12.0˚
±04.˚01
0.0215
±0.006
0.037
Ref
3.0˚
±3˚
0.116
±0.004
0.013
±0.005
0.118
±0.002
0.034
±0.002
0.040
±0.002
0.004
±0.002
0.116
±0.004
0.118
±0.004
95 SP4424CN per tube, no minimum quantity
50 SP4424CU per tube
P
W
Pkg.
CN
CU
NSOIC-8 13" reels: P=8mm, W=12mm
µSOIC-8 13" reels: P=8mm, W=12mm
Minimum qty per reel
Standard qty per reel
500 2500
500 2500
Maximum qty per reel
3000
3000
SP4424DS/16
SP4424 Electroluminescent Lamp Driver
11
© Copyright 2000 Sipex Corporation
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SP4424UEB.PDF ] | |
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