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參數(shù)資料
| 型號(hào)： | SP4423NEB |
| 英文描述： | Electroluminescent Lamp Driver Low Power Applications |
| 中文描述： | 電致發(fā)光燈驅(qū)動(dòng)器的低功耗應(yīng)用 |
| 文件頁(yè)數(shù)： | 3/13頁(yè) |
| 文件大?。?/td> | 180K |
| 代理商： | SP4423NEB |
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SP4423DS/14
SP4423Electroluminescent Lamp Driver
3
Copyright 2000 Sipex Corporation
THEORY OF OPERATION
The
SP4423
is made up of three basic circuit
elements, an oscillator, coil, and switched
H-bridge network. The oscillator provides the
device with an on-chip clock source used to
control the charge and discharge phases for the
coil and lamp. An external capacitor connected
between pins 7 and 8 allows the user to vary the
oscillator frequency from 32kHz to 400kHz.
The graphs on page 6 show the relationship
between C
and lamp output voltage.
In general, increasing the C
capacitor will
increase the lamp output voltage and decrease
the lamp frequency.
The suggested oscillator frequency is 64kHz
(C
=150pF). The oscillator output is internally
divided to create two internal control signals,
f
and f
. The oscillator output is internally
divided down by 8 flip flops; a 64kHz signal
will be divided into 8 frequencies; 32, 16, 8, 4,
2, 1, 0.5, and 0.25 Hz. The 3rd flip flop output
(8kHz) is used to drive the coil (see
Figure 2
on
page 9
) and the 8th flip flop output (250Hz) is
used to drive the lamp. Although the oscillator
frequency can be varied to optimize the lamp
output, the ratio of f
COIL
/f
LAMP
will always
equal 32.
PIN DESCRIPTION
Pin 1 – HON- Enable for driver operation,
high = active; low = inactive.
Pin 2 – V
SS
- Power supply common, connect to
ground.
Pin 3 – Coil- Coil input, connect coil from V
DD
to pin 3.
Pin 4 – Lamp- Lamp driver output2, connect to
EL lamp.
Pin 5 – Lamp- Lamp driver output1, connect to
EL lamp.
Pin 6 – V
DD
- Power supply for driver, connect to
system V
DD
.
Pin 7 – Cap1- Capacitor input 1, connect to C
OSC
.
Pin 8 – Cap2- Capacitor input 2, connect to C
OSC
.
Q
Q
HON
SCR1
SCR2
OSC
FF1
FF2
EL Lamp
V
DD
Coil
4
5
EL2
EL1
7
8
Cap1
Cap2
2
V
SS
V
BATTERY
V
DD
6
3
20mH/70
1
C
O
0.1
μ
F
f
COIL
f
LAMP
f
LAMP
SP4423 Schematic
1
2
3
4
8
7
6
5
S
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP4423 | Electroluminescent Lamp Driver Low Power Applications |
| SP4423CN | Electroluminescent Lamp Driver Low Power Applications |
| SP4423CU | Electroluminescent Lamp Driver Low Power Applications |
| SP4423CX | Electroluminescent Lamp Driver Low Power Applications |
| SP4424 | Electroluminescent Lamp Driver Dual Oscillators |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP4423UEB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver Low Power Applications |
| SP4424 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver Dual Oscillators |
| SP4424CN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver Dual Oscillators |
| SP4424CU | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver Dual Oscillators |
| SP4424CX | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver Dual Oscillators |
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