- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄372181 > SP4412A Electroluminescent Lamp Driver PDF資料下載
參數(shù)資料
| 型號： | SP4412A |
| 英文描述： | Electroluminescent Lamp Driver |
| 中文描述： | 電致發(fā)光燈驅(qū)動器 |
| 文件頁數(shù)： | 3/10頁 |
| 文件大?。?/td> | 119K |
| 代理商： | SP4412A |
SP4412ADS/12
SP4412ACN Electroluminescent Lamp Driver
3
Copyright 2000 Sipex Corporation
THEORY OF OPERATION
The
SP4412A
is made up of three basic circuit
elements, a divider chain, a coil, and a switched
H-bridge network. The countdown chain
provides the circuit with a clock source used to
control the charge and discharge phases for the
coil and lamp. An external oscillator is required
and is delivered to pin 3 of the SO-8 package or
to the "Osc in" pad of the bare die. The chart on
page 6 shows the effect of variations in coil
values used. If a clock frequency other than
32kHz is used, the output of the driver as well as
the amount of current used, will be effected.
The suggested oscillator frequency is 32,768Hz.
This clock frequency is internally divided to
create two internal control signals, f
and
f
. The output is internally divided down by
7 flip flops; therefore, a 32,768Hz signal will be
divided into the following frequencies; 32, 16,
8, 4, 2, 1, 0.5 and 0.25kHz. The second flip flop
output (8 kHz) is used to drive the coil (see
figure 2
on
page 7
) and the seventh flip flop
output (256 Hz) 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 – NC
Pin 3 – Oscillator clock input
Pin 4 – V
SS
- Power supply common, connect to
ground.
Pin 5 – Coil - Coil input, connect coil from V
DD
to Pin 3.
Pin 6 – Lamp- Lamp driver output1, connect to
EL lamp.
Pin 7 – Lamp- Lamp driver output2, connect to
EL lamp.
Pin 8 – V
DD
- Positive supply.
SP4412A Schematic
Q
Q
V
BATTERY
or V
DD
HON
V
DD
FF1
FF2
EL Lamp
6
V
DD
3
Coil
4
5
EL1
EL2
7
8
2
V
SS
30 mH at 125
1
Clock
Divider
Chain
External
Clock
NC
f
COIL
f
LAMP
f
LAMP
1
2
3
4
8
7
6
5
S
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP4412ACN | Electroluminescent Lamp Driver |
| SP4412ACU | Electroluminescent Lamp Driver |
| SP4412ACX | Electroluminescent Lamp Driver |
| SP4414 | Low Cost Electroluminescent Lamp Driver |
| SP4414EN | Low Cost Electroluminescent Lamp Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP4412ACN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver |
| SP4412ACU | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver |
| SP4412ACX | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Electroluminescent Lamp Driver |
| SP4412CN | 制造商:Exar Corporation 功能描述:4412CN |
| SP4414 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Cost Electroluminescent Lamp Driver |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。