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參數資料
| 型號： | SP4427NEB |
| 英文描述： | Electroluminescent Lamp Driver Dual Oscillators with High Drive Capability |
| 中文描述： | 電致發(fā)光燈驅動器，帶有雙高驅動能力振蕩器 |
| 文件頁數： | 3/9頁 |
| 文件大?。?/td> | 119K |
| 代理商： | SP4427NEB |
SP4427DS/01
SP4427 Electroluminescent Lamp Driver
3
Copyright 1997 Sipex Corporation
THEORY OF OPERATION
The
SP4427
is made up of three basic circuit
elements: an oscillator, coil, and switched H-bridge
network. The oscillator portion of the circuit is
divided into two precision oscillators. The
oscillators set the coil and lamp frequencies
independently. This allows for the arbitrary setting
of the coil/lamp frequency ratio. The coil frequency
can be selected for maximum energy transfer per
cycle for a given external coil value. The coil
oscillator is set at 75% duty cycle and the lamp
oscillator is set at 50% duty cycle for minimum DC
offset across the EL lamp.
An external capacitor connected between pin 8
and V
allows the user to vary the lamp oscillator
frequency from 75Hz to 350Hz. Likewise, an
external capacitor connected between pin 1 and
V
allows the user to vary the coil oscillator
frequency from 3.5kHz to 50kHz. The graphs on
page 6 show the relationship between oscillators
(L
and C
OSC
) and their respective capacitor
values.
The coil is an external component connected from
V
to pin 3 of the
SP4427
. Energy is developed
in the coil according to the equation E
L
=1/2LI
2
where the current I is defined as I = (V
-IR-
V
)/R
. In order to maximize the energy produced
by the coil V
battery
should represent the largest
PIN DESCRIPTION
Pin 1 – Cosc- Connect Cap1 from Vss to pin 1 to
set oscillator frequency.
Pin 2 – Vss- Power supply common, connect to
ground.
Pin 3 – Coil- Coil input, connect coil from
Vbattery to pin 3.
Pin 4 – EL2- Lamp driver output1, connect to
EL lamp.
Pin 5 – EL1- Lamp driver output2, connect to
EL lamp.
Pin 6 – Vdd- Power supply for driver, connect to
system Vdd.
Pin 7 – HON- Enable for driver operation,
high = active; low = inactive.
Pin 8 – Losc- Connect Cap2 from Vss to pin 8 to
set lamp frequency.
1
2
3
4
8
7
6
5
S
OSC 1
Coil
EL Lamp
0.1
μ
F
Low
ESR CAP
1
200 pF
OSC 2
Lamp
8
1800 pF
7
6
Vbat
HON
EL
DRIVER
3
5
4
2
+
Vbat
+
L1
20 mH/70
SP4427
Place as close
as possible to
IC pin 6
SP4427 Schematic
相關PDF資料 |
PDF描述 |
|---|---|
| SP4427TR | Electroluminescent Lamp Driver Dual Oscillators with High Drive Capability |
| SP4427UEB | Electroluminescent Lamp Driver Dual Oscillators with High Drive Capability |
| SP4428 | Electroluminescent Lamp Driver High Drive Capability for Low Voltage Applications |
| SP4428CN | Electroluminescent Lamp Driver High Drive Capability for Low Voltage Applications |
| SP4428NEB | Electroluminescent Lamp Driver High Drive Capability for Low Voltage Applications |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SP4427TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver Dual Oscillators with High Drive Capability |
| SP4427UEB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver Dual Oscillators with High Drive Capability |
| SP4428 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver High Drive Capability for Low Voltage Applications |
| SP4428CN | 制造商:Exar Corporation 功能描述:BALLAST/BACKLIGHT CONTROLLER/DRIVER, 8 Pin, Plastic, SOP |
| SP4428NEB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver High Drive Capability for Low Voltage Applications |
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