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SP4426 Datasheet(PDF) 3 Page - Sipex Corporation

Part No. SP4426
Description  Electroluminescent Lamp Driver with High Output Drivers
Download  11 Pages
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Maker  SIPEX [Sipex Corporation]
Homepage  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP4426 Datasheet(HTML) 3 Page - Sipex Corporation

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SP4426DS/01
SP4426 Electroluminescent Lamp Driver
© Copyright 1997 Sipex Corporation
3
THEORY OF OPERATION
The SP4426 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.
The graphs on page 6 show the relationship between
C
osc and lamp output voltage. For a given choice of
coil inductance there will be an optimum C
OSC Cap
valve that gives the maximum light output.
The suggested oscillator frequency is 20kHz
(C
osc=180pF). The oscillator output is internally
divided to create two internal control signals, F
coil
and F
lamp. The oscillator output is internally divided
down by 8 flip flops, a 64kHz signal will be
divided into 8 frequency levels; 32kHz, 16kHz,
8kHz, 4kHz, 2kHz, 1kHz, .5kHz, .25 kHz. The
third flip flop output (8KHz) is used to drive the
coil (see figure 2 on page 8) and the eighth flip flop
output (256Hz) 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.
The on-chip oscillator of the SP4426 can be
overdriven with an external clock source by
removing the C
OSC capacitor and connecting a
clock source to pin 8. The clock should have a 50%
PIN DESCRIPTION
Pin 1— HON- Enable for driver operation,
high=active; low=inactive
Pin 2— N/C- No connect
Pin 3— Vss- Power supply common, connect to
ground.
Pin 4— N/C- No connect
Pin 5— Coil- Coil
Pin 6— D1- Diode cathode connection
Pin 7— EL1- Lamp driver output 1, connect to
EL lamp
Pin 8— EL2- Lamp driver output 2, connect to
EL lamp
Pin 9— N/C- No connect
Pin 10— N/C- No connect
Pin 11— Vdd- Power supply for driver, connect
to system Vdd.
Pin 12— C2- Capacitor input 2, connect to Cosc
Pin 13— N/C- No connect
Pin 14— C1- Capacitor input 1, connect to Cosc
5
6
7
10
9
8
1
2
3
4
14
13
12
11
SP4426 Schematic
Q
Q
Hon
SCR1
SCR2
OSC
FF1
FF6
coil
F
lamp
F
lamp
F
EL Lamp
1M
Vdd
Coil
7
8
EL1
EL2
Cap1
3
Vss
Vbattery
Vdd
11
5
9MH/35
1
180pF
IN4148
6
D1
.1
µF
C1
Optional
1,800pF
11
12
C2
Cap2


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