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參數(shù)資料
| 型號(hào)： | SP4480EY |
| 英文描述： | Dual Electroluminscent Lamp Driver |
| 中文描述： | 雙Electroluminscent燈驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 4/13頁(yè) |
| 文件大?。?/td> | 128K |
| 代理商： | SP4480EY |
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SP4480DS/06
SP4480 Dual Electroluminescent Lamp Driver
4
Copyright 2000 Sipex Corporation
DESCRIPTION
The SP4480 Dual Electroluminescent Lamp
Driver is a low-cost, low voltage device ideal for
the replacement of LED backlighting designs in
keypads, handsets, PDAs and other portable
designs. The EL lamp driver outputs operate in
opposite phase so the SP4480 device can be
easily implemented into applications driving
two EL lamps simultaneously or double-sided
EL lamps. Having a dual lamp driver solution
on a single IC makes available precious printed
circuit board real estate for designers additional
circuitry.
The SP4480 contains a DC-AC inverter that can
produce an AC output of 180V
(typical) from
a +2.2V to +6.0V input voltage. An internal
block diagram of SP4480 can be found in Figure
1.
Electroluminescent Technology
Figure 1: Internal Block Diagram of SP4480
COIL
SP4480
f
COIL
f
LAMP1
f
LAMP1
SCR1
SCR2
12
13
EL2
EL1
ELEN1
7
V
SS
14
V
DD
SCR3
SCR4
11
10
EL4
EL3
FF7
OSC
f
LAMP2
f
LAMP2
ELEN2
R
OSC
1.8k
3
1
2
8
9
CAP
An EL lamp consists of a thin layer of phospho-
rous material sandwiched between two strips of
plastic which emits light (flouresces) when a
high voltage AC signal is applied across it. It
high voltage AC signal is applied across it. It
behaves primarily as a capacitive load. Long
periods of DC voltage applied to the material
tend to reduce its lifetime. With these condi-
tions in mind, the ideal signal to drive an EL
lamp is a high voltage sine wave. Traditional
approaches to achieve this type of waveform
include discrete circuits incorporating a trans-
former, transistors and several resistors and
capacitors. This approach is large and bulky and
cannot be implemented in most handheld equip-
ment. Sipex offers low power single chip driver
circuits specifically designed to drive small to
medium sized electroluminescent panels. Sipex
EL drivers provide a differential AC voltage
without a DC offset to maximize EL lamp life-
time. The only additional components required
for the EL driver circuitry are an inductor, resis-
tor and capacitor.
Electroluminescent backlighting is ideal when
used with LCD's keypads or other backlit dis-
plays. EL lamps uniformly light an area without
creating any undesirable "hot spots" in the dis-
play. Also, an EL lamp consumes less power
that LED's or incandescent bulbs in similar
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP4480NEB | Dual Electroluminscent Lamp Driver |
| SP4490UEB | 320 x 240 pixel format, 5.7in. Display |
| SP4490 | Two Panel Electroluminscent Lamp Driver |
| SP4490EU | Two Panel Electroluminscent Lamp Driver |
| SP4491 | Two Panel Electroluminscent Lamp Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP4480NEB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Dual Electroluminscent Lamp Driver |
| SP448J | 制造商:Panasonic Electric Works 功能描述: |
| SP4490 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Two Panel Electroluminscent Lamp Driver |
| SP4490EU | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Two Panel Electroluminscent Lamp Driver |
| SP4490UEB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Two Panel Electroluminscent Lamp Driver |
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