SP4491EU datasheet(3/13 Pages) SIPEX

Part #	SP4491EU

Description	Two Panel Electroluminscent Lamp Driver

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Manufacturer	SIPEX [Sipex Corporation]

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Rev. 12/19/00

SP4491 Two Panel Electroluminescent Lamp Driver

3

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.

An

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

1

2

3

4

7

8

9

10

VSS

5

EL2

COIL

6

CAP

SP4491

ELEN1

ELEN2

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