ICL7673(1999) 查看數據表（PDF） - Intersil
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ICL7673 Datasheet PDF : 7 Pages
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ICL7673
VP
FUSE
8
2
8
1
VO
120/240
VAC
BRIDGE
RECTIFIER
C1
STEPDOWN
ICL7663
REGULATOR
R2
46
R1
R3
D1 +
-
ICL7673
BATTERY
VS BACK-UP
24
GND
BATTERY
STACK
TRANSFORMER
FIGURE 9. POWER SUPPLY FOR LOW POWER PORTABLE AC TO DC SYSTEMS
+5V
MAIN
POWER
POWER
FAIL
DETECTOR
MICROPROCESSOR
INTERRUPT SIGNAL
VO
VOLATILE
RAM
VP
VS
ICL7673
BACKUP CIRCUIT
+
-
FIGURE 10. TYPICAL MICROPROCESSOR MEMORY APPLICATION
MAIN
SUPPLY
3V
BACKUP
SUPPLY
R2
PNP
PNP
VP
8
R1
R4
1
VO
NC
P-
ICL7673 6
VS
S-
R3
(NOTE 4)
EXTERNAL
EQUIPMENT
2 GND 3
+
-
NOTE 4. > 1MW
FIGURE 11. HIGH CURRENT BATTERY BACKUP SYSTEM
RF
RS
MAIN
SUPPLY
GND
+
BATTERY
BACKUP
-
VP
8
ICL7673
VS
S-
2
3
GND
VO
GND
FIGURE 12. LOW CURRENT BATTERY BACKUP SYSTEM WITH HYSTERESIS
3-86
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