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SP4423NEB Datasheet(PDF) 3 Page - Sipex Corporation

Part # SP4423NEB
Description  Electroluminescent Lamp Driver Low Power Applications
Download  13 Pages
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP4423NEB Datasheet(HTML) 3 Page - Sipex Corporation

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SP4423DS/14
SP4423Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
3
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
OSC
and lamp output voltage.
In general, increasing the C
OSC capacitor will
increase the lamp output voltage and decrease
the lamp frequency.
The suggested oscillator frequency is 64kHz
(C
OSC=150pF). The oscillator output is internally
divided to create two internal control signals,
f
COIL and fLAMP. 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/fLAMP 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
VDD
Coil
4
5
EL2
EL1
7
8
Cap1
Cap2
2
V
SS
VBATTERY
VDD
6
3
20mH/70
1
0.1
µF
fCOIL
fLAMP
fLAMP
SP4423 Schematic
1
2
3
4
8
7
6
5


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