IMP803

IMP803

© 2000 IMP, Inc.

Electroluminescent Lamp Driver

7

Dual Supply Operation with 1.5V Battery

The IMP803 can also be operate from a single battery cell when a

regulated voltage higher than 2.0V is also available. This dual

supply configuration, shown in Figure 5, uses the regulated

voltage to operate the IMP803 while the energy for the high-

voltage boost circuit comes from the battery.

The circuit of Figure 5 thus allows operation with batteries that are

below the 2V minimum specification or above the 6.0V maximum

operating voltage.

+

–

GND

8

7

6

5

1

2

3

4

IMP803

Regulated Voltage

(2.0V to 6.5V)

L

Battery

Voltage

0.1

1N4148

EL lamp

803_13.eps

* Larger values may be required

depending upon supply impedance

OFF = 0V

0.1

µF

100V

Figure 5. Dual Supply Operation

Switch Resistance

The IMP803 inductor switch resistance is typically below 3.5

Ω, as

shown in Figure 6.

525_14.eps

1234567

0

5

10

15

20

25

30

Figure 6. Boost Switch On Resistance