SP4414 datasheet(3/14 Pages) SIPEX

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SP4414DS/17

SP4414 Electroluminescent Lamp Driver

PIN ASSIGNMENTS

Pin 1 — CLK — Clock. Connect this input pin

to an external 32KHz clock sets the

frequency of the internal flip flops.

Pin 2 — V

— Power Supply Common.

Connect to the lowest circuit potential,

typically ground.

Pin 3 — EL2 — Eluminescent Lamp. This is

a lamp driver output pin to connect to the

EL lamp.

Pin 4 — COIL — Coil. The inductor for the

EL lamp is connected from V

BATTERY to this

input pin.

Pin 5 — C

INT

— Integrating Capacitor.

Connecting a fast recovery diode from

COIL (pin 4) to this input pin increases the

light output of the EL lamp. An integrating

capacitor (100pF) connected from this pin to

ground filters out any coil switching spikes

or ripple present in the output waveform to

the EL lamp.

Pin 6 — EL1 — Eluminescent Lamp. This is

a lamp driver output pin to connect to the

EL lamp.

Pin 7— V

DD — Positive Battery Power Supply.

Connect such that +2.2V < V

DD < +4.5V.

Pin 8 — ELEN — Eluminescent Lamp Enable.

When driven HIGH, this input pin enables

the EL driver output EL1 and EL2 (pins 6 and

3, respectively) to the EL lamp.

PINOUT

VSS

CLK

EL2

COIL

CINT

EL1

VDD

ELEN

SP4414

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