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參數(shù)資料
| 型號： | IMP803ISXT |
| 英文描述： | Interface IC |
| 中文描述： | 接口IC |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 184K |
| 代理商： | IMP803ISXT |
IMP803
1999 IMP, Inc.
408-432-9100/www.impweb.com
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.
+
–
V
DD
R
SW-OSC
C
S
L
X
R
EL-OSC
V
A
V
B
GND
8
7
6
5
1
2
3
4
IMP803
R
CL
R
EL
Regulated Voltage
(2.0V to 6.5V)
R
SW
V
IN
L
Battery
Voltage
0.1
μ
F
*
1N4148
EL lamp
803_13.eps
* Larger values may be required
depending upon supply impedance
ON = V
DD
OFF = 0V
0.1
μ
F
100V
C
S
Figure 5. Dual Supply Operation
Switch Resistance
The IMP803 inductor switch resistance is typically below 3.5
, as
shown in
Figure 6
.
O
)
V
DD
(V)
525_14.eps
1
2
3
4
5
6
7
0
5
10
15
20
25
30
Figure 6. Boost Switch On Resistance
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