AMS2954 Просмотр технического описания (PDF) - Advanced Monolithic Systems Inc
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AMS2954 Datasheet PDF : 15 Pages
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TYPICAL APPLICATIONS (Continued)
CURRENT
LIMIT
SECTION
680
2 Ampere Low Dropout Regulator
+VIN = VOUT +.5V
0.05
470
2N3906
4.7MΩ
8
+VIN
ERROR 5
20kΩ
AMS2954
3
7
SD
FB
220
GND
VOUT
4
1
.033
MJE2955
10kΩ
+VOUT @ 2A
ERROR
FLAG
+
+
R1 4.7
TANT.
1%
100µF
R2
VOUT = 1.23V(1+R1/R2)
For 5V VOUT, use internal resistors. Wire pin 6 to 7 and pin 2 to +VOUTBuss.
AMS2954
Regulator with Early Warning and Auxiliary Output
+VIN
D1
8
2
+VIN
SENSE
6
VTAP
1
VOUT
AMS2954
7 FB
#1
5
ERROR
GND
4
D2
5V MEMORY
SUPPLY
+
1µF
20
3.6V
NICAD
2.7MΩ
27 kΩ
D3
D4
EARLY WARNING
Q1
8
2
+VIN
6
VTAP
SENSE
VOUT
7 FB AMS2954
#2
3 SD
ERROR 5
GND
4
330 kΩ
MAIN 5V OUTPUT
RESET
µP
VDD
+
1µF
• Early warning flag on low input voltage
• Main output latches off at lower input voltages
• Battery backup on auxiliary output
Operation: Reg.#1’s VOUT is programmed one diode drop above 5V. It’s error flag
becomes active when VIN≤ 5.7V. When VIN drops below 5.3V, the error flag of
Reg.#2 becomes active and via Q1 latches the main output off. When VIN again
exceeds 5.7V Reg.#1 is back in regulation and the early warning signal rises,
unlatching Reg.#2 via D3.
1A Regulator with 1.2V Dropout
UNREGULATE
D INPUT
1Μ Ω
1µF
10kΩ
0.01µ F
6
VTAP
8
IN
2
SENSE
AMS2954
7
FB
GND
4
OUT 1
0.002µ F
SUPERTEX
VP12C
OUTPUT
5V ± 1% @
+
0 TO 1A
220µ F
2kΩ
IQ ≅ 400µA
Latch Off When Error Flag Occurs
+VIN
470kΩ
8
5
+VIN
ERROR
VOUT
1
470kΩ
AMS2954
RESET
3 SD
GND
4
7
FB
VOUT
R1
+
1µF
R2
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723
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