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參數(shù)資料
| 型號： | SP4425 |
| 英文描述： | Electroluminescent Lamp Driver Low Voltage Applications |
| 中文描述： | 電致發(fā)光燈驅(qū)動器低電壓應(yīng)用 |
| 文件頁數(shù)： | 4/14頁 |
| 文件大小： | 176K |
| 代理商： | SP4425 |
SP4425DS/20
SP4425 Electroluminescent Lamp Driver
4
Copyright 2000 Sipex Corporation
THEORY OF OPERATION
The
SP4425
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
V
allows the user to vary the oscillator frequency.
For a given choice of coil inductance there will be
an optimum C
Capacitor value that gives the
maximum light output.
The suggested oscillator frequency is 25.6kHz
(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 25.6kHz signal will be divided into 6
frequency levels: 12.8kHz, 6.4kHz, 3.2kHz,
1.6kHz, 800Hz, and 400Hz. The oscillator output
(25.6kHz) is used to drive the coil (see
figure 2
on
page 11
) 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
SP4425
. V
= 1.5
VDC with a 470
μ
H/4
coil are typical conditions.
Energy is stored in the coil according to the equation
E
L
=1/2LI
2
, where I is the peak current flowing in
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
SP4425 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
470
μ
H/4
8
180pF
IN4148
4
D1
.1
μ
F
C
OSC
Low ESR
decoupling
C
INT
=1800pF typ
f
COIL
f
LAMP
f
LAMP
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP4425CN | Electroluminescent Lamp Driver Low Voltage Applications |
| SP4425CU | Electroluminescent Lamp Driver Low Voltage Applications |
| SP4425CX | Electroluminescent Lamp Driver Low Voltage Applications |
| SP4425NEB | Electroluminescent Lamp Driver Low Voltage Applications |
| SP4426 | Electroluminescent Lamp Driver with High Output Drivers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP4425CN | 制造商:Exar Corporation 功能描述:BALLAST/BACKLIGHT CONTROLLER/DRIVER, 8 Pin, Plastic, SOP |
| SP4425CU | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver Low Voltage Applications |
| SP4425CX | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver Low Voltage Applications |
| SP4425NEB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver Low Voltage Applications |
| SP4425Q | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver for Low Noise Applications |
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