SP4405EN View Datasheet(PDF) - Signal Processing Technologies

Part Name

Description

MFG CO.

SP4405EN

Low Voltage Electroluminescent Lamp Driver with Regulated Output Voltage

Signal Processing Technologies 

TEST CIRCUIT

VBATTERY

ELEN

1

ROSC

750kΩ

VDD 6

ROSC 8

SP4405

3

COIL

7

CINT

C1

C2

0.1µF

1nF

2

VSS

4

EL1

5

EL2

EL Lamp

L1

470µH

D1

1N4148

CINT

0.1µF

50Ω

50Ω

6.8nF

1MΩ

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 — VSS — Power Supply Common.

Connect to the lowest circuit potential,

typically ground.

Pin 3 — COIL — Coil. The inductor for the

EL lamp is connected from VBATTERY 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 — VDD — Positive Battery Power Supply.

Connect such that +2.2V < V < +4.5V.

DD

Pin 7 — CINT — 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 (0.1µF) 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 — ROSC — Oscillator Resistor. Connecting

a 450kΩ resistor to this input pin sets the

frequency of the internal clock.

PINOUT

ELEN 1

VSS 2

COIL 3

EL1 4

SP4405

8 ROSC

7 CINT

6 VDD

5 EL2

SP4405DS/18

SP4405 Low Voltage Electroluminescent Lamp Driver

3

© Copyright 2000 Sipex Corporation

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