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參數(shù)資料
| 型號： | SP4415CN |
| 英文描述： | Electroluminescent Lamp Driver with Selectable Level Outputs |
| 中文描述： | 電致發(fā)光燈驅(qū)動器，帶有可選電平輸出 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大小： | 158K |
| 代理商： | SP4415CN |
SP4415DS/06
SP4415 Electroluminescent Lamp Driver
5
Copyright 1996 Sipex Corporation
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
which is the oscillator frequency divided by 128.
For a 32,768 Hz oscillator, f
LAMP
=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
.
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 achieving this
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
which can be optimized for specific applications.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP4416UEB | Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature |
| SP4416 | Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature |
| SP4416EU | Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature |
| SP4422ANEB | Circular Connector; No. of Contacts:55; Series:MS27508; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:16; Circular Contact Gender:Pin; Circular Shell Style:Box Mount Receptacle; Insert Arrangement:16-55 RoHS Compliant: No |
| SP4422AUEB | ER 14C 12#16 2#4 SKT RECP BOX RoHS Compliant: No |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP4416 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature |
| SP4416EU | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature |
| SP4416UEB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver with 4-Level Light Intensity Selection Feature |
| SP4422 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver |
| SP4422A | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver |
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