SP4403 datasheet(3/14 Pages) SIPEX

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SP4403DS/05

SP4403 Electroluminescent Lamp Driver

PIN ASSIGNMENTS

Pin 1 — ELEN — Electroluminescent 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

— 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

BATT to this

input pin.

Pin 4 — EL1 — Electroluminescent Lamp. This

is a lamp driver output pin to connect to the

EL lamp.

Pin 5 — EL2 — Electroluminescent 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

— Integrator Capacitor.

An Integrator Capacitor (470pF typical)

connected from this pin to ground filters out

any coil switching spikes or ripple present

in the outer waveform to the EL lamp.

Connecting a fast recovery diode from

COIL (pin 3) to this input pin increases the

light output of 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.

PINOUT

ELEN

VDD

ROSC

VSS

COIL

EL2

CINT

EL1

SP4403

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