IMP803/D1 IMP [IMP, Inc], IMP803/D1 Datasheet - Page 7

• Manufacturer Part Number: IMP803/D1
• Description: HIGH-VOLTAGE EL LAMP DRIVER
• Manufacturer: IMP [IMP, Inc]

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.
Switch Resistance
The IMP803 inductor switch resistance is typically below 3.5Ω, as
shown in Figure 6.
© 2000 IMP, Inc.
Voltage
Battery
OFF = 0V
ON = V
* Larger values may be required
depending upon supply impedance
+
–
DD
V
IN
0.1µF
L
*
1N4148
C
Figure 5. Dual Supply Operation
S
0.1µF
100V
R
Regulated Voltage
SW
(2.0V to 6.5V)
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.
1
2
3
4
V
R
C
L
X
DD
SW-OSC
S
Electroluminescent Lamp Driver
IMP803
30
25
20
15
10
5
0
Figure 6. Boost Switch On Resistance
1
R
EL
R
EL-OSC
GND
2
V
V
A
B
8
7
6
5
3
V
DD
R
4
CL
(V)
5
I M P 8 0 3
I M P 8 0 3
EL lamp
6
803_13.eps
525_14.eps
7
7