IMP803 Просмотр технического описания (PDF) - IMP, Inc

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IMP803

High-Voltage EL Lamp Driver

IMP, Inc 

IMP803

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.

ON = VDD

OFF = 0V

Regulated Voltage

(2.0V to 6.5V)

REL

RSW

L

Battery +

Voltage – VIN

1N4148

0.1µF*

CS

0.1µF

100V

1 VDD

REL-OSC 8

RCL

2 RSW-OSC

VA 7

3 CS

VB 6

4 LX

GND 5

IMP803

EL lamp

* Larger values may be required

depending upon supply impedance

Figure 5. Dual Supply Operation

803_13.eps

Switch Resistance

The IMP803 inductor switch resistance is typically below 3.5Ω, as

shown in Figure 6.

30

25

20

15

10

5

0

1

2

3

4

5

6

7

VDD (V)

525_14.eps

Figure 6. Boost Switch On Resistance

© 2000 IMP, Inc.

Electroluminescent Lamp Driver

7

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