AMS2954 Просмотр технического описания (PDF) - Advanced Monolithic Systems Inc
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AMS2954 Datasheet PDF : 15 Pages
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AMS2954
Note 8: The junction-to-ambient thermal resistance are as follows:60°C/W for the TO-220 (T), 73°C/W for the TO-263 (M), 80°C/W for the TO-252 (D),
90°C/W for the SOT-223 (with package soldering to copper area over backside ground plane or internal power plane ϕ JA can vary from 46°C/W to >90°C/W
depending on mounting technique and the size of the copper area), 105°C/W for the molded plastic DIP (P) and 160°C/W for the molded plastic SO-8 (S).
Note 9: May exceed input supply voltage.
Note 10: When used in dual-supply systems where the output terminal sees loads returned to a negative supply, the output voltage should be diode-clamped to
ground.
Note 11: Vshutdown ≥ 2V, Vin ≤ 30V, Vout =0, Feedback pin tied to 5VTAP.
Note 12: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.
Note 13: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or line
regulation effects. Specifications are for a 50mA load pulse at VIN =30V (1.25W pulse) for T =10 ms.
Note 14: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects
are covered under the specification for thermal regulation.
Note 15: Line regulation for the AMS2954 is tested at 150°C for IL = 1 mA. For IL = 100 µA and TJ = 125°C, line regulation is guaranteed by design to 0.2%.
See typical performance characteristics for line regulation versus temperature and load current.
BLOCK DIAGRAM AND TYPICAL APPLICATIONS
AMS2954-XX
3 Lead Packages
AMS2954-XX
8 Lead Packages
UNREGULATED DC
+
INPUT
+
- ERROR
AMPLIFIER
+ 1.23V
REFERENCE
OUTPUT
VOUT
IL≤ 150mA
+ SEE APPLICATION
HINTS
GROUND
UNREGULATED DC
VOUT
IL≤ 150mA
7
8
1
+
FEED-
BACK
INPUT
OUTPUT
FROM
CMOS
OR TTL
3
SHUT-
DOWN
50mV
+
+
-
ERROR
AMPLIFIER
++
-
1.23V
REFERENCE
2
SENSE
6
VTAP
5
ERROR
4
GROUND
+ SEE APPLICATION
HINTS
330k Ω
TO CMOS
OR TTL
ERROR DETECTION COMPARATOR
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
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