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參數(shù)資料
| 型號： | ICL7673CPAZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Automatic Battery Back-Up Switch |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8 |
| 封裝： | PLASTIC, MS-001-BA, DIP-8 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 223K |
| 代理商： | ICL7673CPAZ |
5
FN3183.4
July 22, 2005
Applications for the ICL7673 include volatile semiconductor
memory storage systems, real-time clocks, timers, alarm
systems, and over/under the voltage detectors. Other
systems requiring DC power when the master AC line supply
fails can also use the ICL7673.
A typical application, as illustrated in Figure 12, would be a
microprocessor system requiring a 5V supply. In the event of
primary supply failure, the system is powered down, and a
3V battery is employed to maintain clock or volatile memory
data. The main and backup supplies are connected to V
P
and V
S
, with the circuit output V
O
supplying power to the
clock or volatile memory. The ICL7673 will sense the main
supply, when energized, to be of greater potential than V
S
and connect, via its internal MOS switches, V
P
to output V
O
.
The backup input, V
S
will be disconnected internally. In the
event of main supply failure, the circuit will sense that the
backup supply is now the greater potential, disconnect V
P
from V
O
, and connect V
S
.
Figure 11 illustrates the use of external PNP power
transistors to increase the power switching capability of the
circuit. In this application the output current is limited by the
beta and thermal characteristics of the power transistors.
If hysteresis is desired for a particular low power application,
positive feedback can be applied between the input V
P
and
open drain output S
BAR
through a resistor as illustrated in
Figure 12. For high power applications hysteresis can be
applied as shown in Figure 13.
The ICL7673 can also be used as a clipping circuit as
illustrated in Figure 14. With high impedance loads the
circuit output will be nearly equal to the greater of the two
input signals.
V
P
V
O
V
S
GND
Pbar
8
2
1
6
V
O
+5V OR +3V
R
I
STATUS
INDICATOR
LITHIUM
BATTERY
GND
+5V
PRIMARY
SUPPLY
4
+
-
FIGURE 7. ICL7673 BATTERY BACKUP CIRCUIT
V
P
V
O
V
S
GND
8
2
1
V
+5V OR +3V
RECHARGEABLE
BATTERY
GND
+5V
PRIMARY
SUPPLY
4
R
C
+
-
FIGURE 8. APPLICATION REQUIRING RECHARGEABLE
BATTERY BACKUP
FIGURE 9. POWER SUPPLY FOR LOW POWER PORTABLE AC TO DC SYSTEMS
FIGURE 10. TYPICAL MICROPROCESSOR MEMORY APPLICATION
FUSE
120/240
VAC
BRIDGE
RECTIFIER
BATTERY
STACK
GND
V
O
V
S
V
P
1
8
2
4
2
8
4
6
STEPDOWN
TRANSFORMER
R
3
R
2
R
1
C
1
D
1
+
-
ICL7673
BATTERY
BACK-UP
ICL7663
REGULATOR
POWER
FAIL
DETECTOR
MICROPROCESSOR
VOLATILE
RAM
INTERRUPT SIGNAL
ICL7673
BACKUP CIRCUIT
+5V
MAIN
POWER
V
O
V
P
V
S
+
-
ICL7673
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