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參數(shù)資料
| 型號： | SP4405 |
| 英文描述： | Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage |
| 中文描述： | 低電壓電致發(fā)光燈驅(qū)動器，輸出電壓 |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 158K |
| 代理商： | SP4405 |
SP4405DS/18
SP4405 Low Voltage Electroluminescent Lamp Driver
4
Copyright 2000 Sipex Corporation
DESCRIPTION
The
SP4405
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
SP4405
contains a DC-AC inverter
that can produce an AC output of 160V
(typical)
from a +2.2V to +4.5V input voltage. An
internal feedback loop regulates the lamp voltage
output to 160V
(typical) with varying supply
voltages to maintain constant EL lamp
brightness. An internal block diagram of the
SP4405
can be found in
Figure 1
.
The
SP4405
is built on
Sipex's
dielectrically
isolated BiCMOS process that provides the
isolation required to separate the high voltage
AC signal used to drive the EL lamp from the
low voltage logic and signal processing circuitry.
This ensures latch-up free operation in the
interface between the low voltage CMOS
circuitry and the high voltage bipolar circuitry.
A total of only six external components are
required for the standard operation of the
SP4405
: an inductor, a fast recovery diode,
three capacitors and a resistor. A diagram of the
SP4405
in a typical application can be found in
Figure 2
.
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
Figure 1. Internal Diagram of the SP4405
f
COIL
f
LAMP
f
LAMP
FF7
Q
Q
V
BATTERY
L2
470
μ
H, 3
EL Lamp
SCR1
SCR2
4
5
2
V
SS
C
INT
COIL
EL2
EL1
C
INT
**
0.1
μ
F
OSC
OSC
R
V
REF
=1.25V
ELEN
COERROR
SP4405
C
1
0.1
μ
F
*
1D1
V
DD
6
R
OSC
8
3
7
1
2
C
NOTES:
*
Optional Component
**
C
INT
may be decreased to change the square wave output to a sawtooth waveform.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP4405EN | Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage |
| SP4405EU | Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage |
| SP4405NEB | Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage |
| SP4412 | Electroluminescent Lamp Driver |
| SP4412A | Electroluminescent Lamp Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP4405EN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage |
| SP4405EU | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage |
| SP4405NEB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage |
| SP4405UEB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage |
| SP4412 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver |
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