Rev. 12/19/00

SP4490 Two Panel Electroluminescent Lamp Driver

© Copyright 2000 Sipex Corporation

4

Figure 1: Internal Block Diagram of SP4491

1

N

E

L

E2

N

E

L

Et

u

p

t

u

O

1

L

Et

u

p

t

u

O

2

L

E

00

F

F

OF

F

O

01

F

F

ON

O

10

N

OF

F

O

11

N

ON

O

Table 1: Control Line Logic Table

COIL

SP4491

EL Lamp

SCR1

SCR2

EL1

L1

2.2mH

EL Lamp

SCR3

EL2

ELcommon

1000pF

D1

1N4148

FF7

OSC

560k

Ω

CAP

C2*

1nF

C1

0.1

µF

* optional device

ELEN2

0

1

6

9

9

8

10

5

4

2

3

ELEN1

1