SP4491 datasheet(3/13 Pages) SIPEX

3 / 13 page

Rev. 12/19/00

SP4491 Two Panel Electroluminescent Lamp Driver

PIN ASSIGNMENTS

Pin 1 — ELEN1 — Electroluminescent Lamp

Enable Control Line 1. This is a control line

to enable a single or dual EL lamp output.

Refer to Table 1 for the control logic.

Pin 2 — V

DD — Positive Battery Power Supply.

Connect such that +2.636V < V

DD < +3.15V.

Pin 3 — R

OSC — Oscillator Resistor. Connecting

a resistor between this input pin andV

DD sets

the frequency of the internal clock.

Pin 4 — ELEN2 — Electroluminescent Lamp

Enable Control Line 2. This a control line to

enable a single or dual EL lamp output. Refer

to Table 1 for the control logic.

Pin 5 — V

SS — Power Supply Common. Con-

nect to the lowest circuit potential, typically

ground.

Pin 6 — COIL — Coil. The inductor for the

boost converter is connected from V

BATT to

this input pin.

Pin 7 — CAP — Integrator Capacitor.

integrating capacitor

(1800pF typically)

connected from this pin to ground filters out

any coil switching spikes or ripple present in

the output waveform to the EL lamps. Con-

necting a fast recovery diode from COIL to

CAP increases the light output of the EL

lamp.

Pin 8 — EL COMMON — Electroluminescent

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.

PINOUT

ROSC

VDD

ELcommon

EL1

VSS

EL2

COIL

CAP

SP4491

ELEN1

ELEN2

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