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參數(shù)資料
| 型號： | SP4490EU |
| 英文描述： | Two Panel Electroluminscent Lamp Driver |
| 中文描述： | 兩個小組Electroluminscent燈驅(qū)動器 |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 163K |
| 代理商： | SP4490EU |
Rev. 9/12/00
SP4490 Two Panel Electroluminescent Lamp Driver
5
Copyright 2000 Sipex Corporation
Figure 2: Typical Application Circuit of SP4490
R
OSC
V
SS
COIL
CAP
SP4490
V
BATT
C1
0.1
μ
F
R
464k
L1
470
μ
H
6
2
3
1
7
5
EL1/EL2
D1
1N4148
C
1800pF
V
DD
ELcommon
EL1
EL Lamp
9
10
C2*
10nF
4
ON/OFF
* optional device
EL2
8
EL Lamp
Electroluminescent backlighting is ideal when
used with LCD displays, keypads or other back-
lit readouts. EL lamps uniformly light an area
without creating any undesirable "hot spots" in
the display. Also, an EL lamp typically con-
sumes less power that LED's or incandescent
bulbs in similar lighting situations. These fea-
tures make EL ideal for attractive, battery pow-
ered products.
THEORY OF OPERATION
Coil Switch
The SP4490 has an inductor-based boost con-
verter to generate the high voltage used to drive
the EL lamp. Energy is stored in the inductor
according to the equation E
= 1/2 (LI
I
= (t
) (V
- V
) /L. An internal oscilla-
tor controls the coil switch. During the time the
coil switch is on, the coil is connected between
V
DD
and the saturation voltage of the
2
) where
coil switch is on, the coil is connected between
V
and coil switch and a magnetic field devel-
ops in the coil. When the coil switch turns off,
the switch opens, the magnetic field collapses
and the voltage across the coil rises. The internal
diode forward biases when the coil voltage rises
above the H-Bridge voltage and the energy en-
ters the EL lamp. Each pulse increases the
As the voltage approaches its maximum, the
steps become smaller. (see figure 4).
The brightness of the EL lamp output is directly
related to energy recovery in the boost converter.
There are many variations among coils such as
magnetic core differences, winding differences
and parasitic capacitances. For suggested coil
suppliers refer to page 10.
Oscillator
The internal oscillator generates a high frequency
clock used by the boost converter and H-
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PDF描述 |
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| SP4491 | Two Panel Electroluminscent Lamp Driver |
| SP4491EU | Two Panel Electroluminscent Lamp Driver |
| SP4491UEB | Two Panel Electroluminscent Lamp Driver |
| SP4501EY | EL Plus Piezo Driver |
| SP4501NEB | EL Plus Piezo Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP4490UEB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Two Panel Electroluminscent Lamp Driver |
| SP4491 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Two Panel Electroluminscent Lamp Driver |
| SP4491EU | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Two Panel Electroluminscent Lamp Driver |
| SP4491UEB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Two Panel Electroluminscent Lamp Driver |
| SP-45/4 | 制造商:Distributed By MCM 功能描述:3'' Full Range Speaker - 4 ohm |
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