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SP4405 Datasheet(PDF) 3 Page - Sipex Corporation

Part # SP4405
Description  Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage
PDF  20 Pages
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP4405 Datasheet(HTML) 3 Page - Sipex Corporation

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SP4405DS/18
SP4405 Low Voltage Electroluminescent Lamp Driver
© Copyright 2000 Sipex Corporation
3
PINOUT
ELEN
VDD
ROSC
VSS
COIL
EL2
CINT
EL1
SP4405
8
7
4
3
2
1
5
6
PIN ASSIGNMENTS
Pin 1 — ELEN — Eluminescent Lamp Enable.
When driven HIGH, this input pin enables
the EL driver output EL1 and EL2 (pins 4 and
5, respectively) to the EL lamp.
Pin 2 — V
SS
— Power Supply Common.
Connect to the lowest circuit potential,
typically ground.
Pin 3 — COIL — Coil. The inductor for the
EL lamp is connected from V
BATTERY to this
input pin.
Pin 4 — EL1 — Eluminescent Lamp. This is
a lamp driver output pin to connect to the
EL lamp.
Pin 5 — EL2 — Eluminescent Lamp. This is
a lamp driver output pin to connect to the
EL lamp.
Pin 6 — V
DD — Positive Battery Power Supply.
Connect such that +2.2V < V
DD < +4.5V.
Pin 7 — C
INT
— Integrating Capacitor.
Connecting a fast recovery diode from
COIL (pin 3) to this input pin increases
the light output of the EL lamp. An
integrating capacitor (0.1
µF) connected
from this pin to ground filters out any coil
switching spikes or ripple present in the
output waveform to the EL lamp.
Pin 8 — R
OSC — Oscillator Resistor. Connecting
a 450k
Ω resistor to this input pin sets the
frequency of the internal clock.
TEST CIRCUIT
ROSC
VSS
COIL
CINT
SP4405
VBATTERY
C1
0.1
µF
ROSC
750k
Ω
L1
470
µH
3
6
8
1
7
2
ELEN
D1
1N4148
CINT
0.1
µF
VDD
EL2
EL1
EL Lamp
5
4
C2
1nF
6.8nF
50
Ω
50
Ω
1M
Ω



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