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參數(shù)資料
| 型號： | SP4425QCU |
| 英文描述： | Electroluminescent Lamp Driver for Low Noise Applications |
| 中文描述： | 電致發(fā)光燈驅(qū)動器的低噪聲應(yīng)用 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 215K |
| 代理商： | SP4425QCU |
SP4425QDS/12
SP4425Q Electroluminescent Lamp Driver
3
Copyright 1998 Sipex Corporation
THEORY OF OPERATION
The
SP4425Q
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 1 and
Vss allows the user to vary the oscillator frequency.
For a given choice of coil inductance there will be
an optimum C
capacitor value that provides
maximum light output.
The suggested oscillator frequency is 28.8kHz
(C
=180pF). The oscillator output is internally
divided to create the control signal for f
. The
oscillator output is internally divided down by 6
flip flops. A 28.8kHz signal will be divided into 6
frequency levels: 14.4kHz, 7.2kHz, 3.6kHz,
1.8kHz, 900kHz, and 450Hz. The oscillator output
(28.8kHz) is used to drive the coil (see
figure 2
on
page 6
) and the sixth flip flop output (300Hz) 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 64.
The coil is an external component connected from
V
to pin 3 of the
SP4425Q
. V
= 3.0
VDC with a 2mH/44
coil are typical conditions.
Energy is stored in the coil according to the equation
PIN DESCRIPTION
Pin 1 – C
- Capacitor input 1, connect Capacitor
from V
SS
to Pin 1 to set C
OSC
frequency.
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 – D1- Diode Cathode connection.
– C
- Integrator capacitor, connect capacitor
from pin 4 to ground to minimize coil glitch energy.
Pin 5 – Lamp- Lamp driver output2, connect to
EL lamp.
Pin 6 – Lamp- Lamp driver output1, connect to
EL lamp.
Pin 7 – V
DD
- Power supply for driver, connect to
system V
DD
.
Pin 8 – HON- Enable for driver operation,
high = active; low = inactive.
1
2
3
4
8
7
6
5
S
SP4425Q Schematic
Q
Q
HON
SCR1
SCR2
OSC
FF1
FF6
EL Lamp
1M
V
DD
Coil
5
6
EL2
EL1
1
Cap1
2
V
SS
V
BATTERY
V
DD
7
3
2mH/44
8
180pF
IN4148
4
D1
.1
μ
F
C
OSC
Low ESR
C
INT
= 820pF typical
QR2
QR1
f
COIL
f
LAMP
f
LAMP
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP4425QCUEB | Electroluminescent Lamp Driver for Low Noise Applications |
| SP4425UEB | Electroluminescent Lamp Driver Low Voltage Applications |
| SP4425 | Electroluminescent Lamp Driver Low Voltage Applications |
| SP4425CN | Electroluminescent Lamp Driver Low Voltage Applications |
| SP4425CU | Electroluminescent Lamp Driver Low Voltage Applications |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP4425QCUEB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver for Low Noise Applications |
| SP4425UEB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver Low Voltage Applications |
| SP4426 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver with High Output Drivers |
| SP4427 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver Dual Oscillators with High Drive Capability |
| SP4427CN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver Dual Oscillators with High Drive Capability |
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