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SP4427 Folha de dados(PDF) 3 Page - Sipex Corporation

Nome de Peças SP4427
Descrição Electrónicos  Electroluminescent Lamp Driver Dual Oscillators with High Drive Capability
PDF  9 Pages
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Fabricante Electrônico  SIPEX [Sipex Corporation]
Página de início  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP4427 Folha de dados(HTML) 3 Page - Sipex Corporation

  SP4427 Datasheet HTML 1Page - Sipex Corporation SP4427 Datasheet HTML 2Page - Sipex Corporation SP4427 Datasheet HTML 3Page - Sipex Corporation SP4427 Datasheet HTML 4Page - Sipex Corporation SP4427 Datasheet HTML 5Page - Sipex Corporation SP4427 Datasheet HTML 6Page - Sipex Corporation SP4427 Datasheet HTML 7Page - Sipex Corporation SP4427 Datasheet HTML 8Page - Sipex Corporation SP4427 Datasheet HTML 9Page - Sipex Corporation  
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SP4427DS/01
SP4427 Electroluminescent Lamp Driver
© Copyright 1997 Sipex Corporation
3
THEORY OF OPERATION
The SP4427 is made up of three basic circuit
elements: an oscillator, coil, and switched H-bridge
network. The oscillator portion of the circuit is
divided into two precision oscillators. The
oscillators set the coil and lamp frequencies
independently. This allows for the arbitrary setting
of the coil/lamp frequency ratio. The coil frequency
can be selected for maximum energy transfer per
cycle for a given external coil value. The coil
oscillator is set at 75% duty cycle and the lamp
oscillator is set at 50% duty cycle for minimum DC
offset across the EL lamp.
An external capacitor connected between pin 8
and V
SS allows the user to vary the lamp oscillator
frequency from 75Hz to 350Hz. Likewise, an
external capacitor connected between pin 1 and
V
SS
allows the user to vary the coil oscillator
frequency from 3.5kHz to 50kHz. The graphs on
page 6 show the relationship between oscillators
(L
OSC and COSC) and their respective capacitor
values.
The coil is an external component connected from
V
battery to pin 3 of the SP4427. Energy is developed
in the coil according to the equation E
L=1/2LI
2
where the current I is defined as I = (V
battery-IR-
V
OL)/RT. In order to maximize the energy produced
by the coil V
battery should represent the largest
PIN DESCRIPTION
Pin 1 – Cosc- Connect Cap1 from Vss to pin 1 to
set oscillator frequency.
Pin 2 – Vss- Power supply common, connect to
ground.
Pin 3 – Coil- Coil input, connect coil from
Vbattery to pin 3.
Pin 4 – EL2- Lamp driver output1, connect to
EL lamp.
Pin 5 – EL1- Lamp driver output2, connect to
EL lamp.
Pin 6 – Vdd- Power supply for driver, connect to
system Vdd.
Pin 7 – HON- Enable for driver operation,
high = active; low = inactive.
Pin 8 – Losc- Connect Cap2 from Vss to pin 8 to
set lamp frequency.
1
2
3
4
8
7
6
5
OSC 1
Coil
EL Lamp
0.1
µF
1
200 pF
OSC 2
Lamp
8
1800 pF
7
6
Vbat
HON
EL
DRIVER
3
5
4
2
+
Vbat
+
L1
20 mH/70
Ω
SP4427
Place as close
as possible to
IC pin 6
Low
ESR CAP
SP4427 Schematic



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