SP4490 datasheet(3/12 Pages) SIPEX

3 / 12 page

Rev. 9/12/00

SP4490 Two Panel Electroluminescent Lamp Driver

PIN ASSIGNMENTS

Pin 1 — EL1/EL2 — Electroluminescent Lamp

Output Select. Selects either EL1 Output

when input is LOW or EL2 Output when

input is HIGH.

Pin 2 — V

DD — Positive Battery Power Supply.

This pin should be bypassed with a 0.1

µF

capacitor.

Pin 3 — R

OSC — Oscillator Resistor. Connecting

a resistor between this pin and V

DD sets the

frequency of the internal oscillator.

Pin 4 — ON/OFF — Enable. When driven

HIGH, this input pin enables the internal

oscillator and EL driver outputs.

Pin 5 — V

SS — Power Supply Ground. Connect

to the lowest circuit potential, typically

ground.

Pin 6 — COIL — Coil. The inductor for the

boost converter is connected from V

BATT to

this pin.

Pin 7 — CAP — Integrating Capacitor. An

integrating capacitor connected from this pin

to ground filters out any coil switching spikes

or ripple present in the output waveform to

the EL lamps. Connecting a fast recovery

diode from COIL to CAP increases the light

output of the EL lamp.

Pin 8 — EL COMMON — Electroluminescent

Lamp Common. This is a high voltage lamp

driver output pin common to both EL lamps.

Pin 9 — EL2 — Electroluminescent Lamp Out-

put 2. This is a high voltage lamp driver

output pin connect to the second EL lamp.

Pin 10 — EL1 — Electroluminescent Lamp

Output 1. This is a high voltage lamp driver

output pin to connect to the first EL lamp.

ROSC

VDD

ELcommon

EL1

VSS

EL2

COIL

CAP

SP4490

EL1/EL2

ON/OFF

PINOUT

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