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PDF SP4415 Data sheet ( Hoja de datos )
| Número de pieza | SP4415 | |
| Descripción | Electroluminescent Lamp Driver with Selectable Level Outputs | |
| Fabricantes | Sipex Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP4415 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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SIGNAL PROCESSING EXCELLENCE
SP4415
Electroluminescent Lamp Driver
with Selectable Level Outputs
s 2.2 V- 3.6 V Battery Operation
s 50 nA Maximum Standby Current
s Four Level Selectable Output
s High Voltage Output 140VPP Typical
s High Impedance Clock Signal
Conditioner
APPLICATIONS
s Watches
s Pagers
s Backlit LCD Displays
DataShee
DESCRIPTION
The SP4415 is a single chip DC-AC converter ideally suited for driving electroluminescent
panels to four intensity levels. The SP4415 is capable of converting DC input voltages as low
as 2.2V into any of four AC voltagDe aletavSelhseweth4iUch.cocamn be set via external switch. A high
impedance clock input and signal conditioner allows users to connect crystal oscillators
directly to the CLK input without interfering with existing system timing, no buffering of the
crystal oscillator is necessary. The SP4415 requires only one external inductor and is offered
in an 8-pin NSOIC package. For delivery in die form, please consult the factory.
No Connect 1
VSS 2
COIL 3
EL2 4
SP4415
8 CLK
7 Level Select
6 VDD
5 EL1
DataSheet4U.com
SP4415 Block Diagram
SP4415DS/06
DataSheet4 U .com
SP4415 Electroluminescent Lamp Driver
1
© Copyright 1996 Sipex Corporation
1 page  
www.DataSheet4U.com
The H-bridge consists of two SCR structures that
act as high voltage switches. These two switches
control the polarity of how the lamp is charged. The
SCR switches are controlled by the f signal
LAMP
which is the oscillator frequency divided by 128.
For a 32,768 Hz oscillator, fLAMP=256 Hz.
When the energy from the coil is released, a high
voltage spike is created triggering the SCR switches.
The direction of current flow is determined by
which SCR is enabled. One full cycle of the
H-bridge will create 16 voltage steps from ground
to 80V (typical) on pins 6 and 7 which are 180
degrees out of phase with each other (see figure 3
on page 7). A differential view of the outputs is
shown in figure 4 on page 7.
et4U.com
ELECTROLUMINESCENT TECHNOLOGY
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 or reversed.
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 achievDinagtathSisheet4U.com
type of waveform included discrete circuits
incorporating a transformer, transistors, and several
resistors and capacitors. This approach is large and
bulky, and cannot be 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.
Electroluminescent backlighting is ideal when used
with LCD displays, keypads, or other backlit
readouts. Its main use is to illuminate displays in
dim to dark conditions for momentary periods of
time. EL lamps typically consume less current than
LEDs or incandescent 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 applied to the lamp, the frequency at which
it is applied, the lamp material used and its size, and
lastly, the inductor used. There are many variables
DataSheet4Uw.hcicohmcan be optimized for specific applications.
SP4415DS/06
DataSheet4 U .com
SP4415 Electroluminescent Lamp Driver
5
DataShee
© Copyright 1996 Sipex Corporation
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SP4415.PDF ] | |
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