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LM323_02 Datasheet(PDF) 5 Page - ON Semiconductor

Part No. LM323_02
Description  3.0 A Positive Voltage Regulators
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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LM323, LM323A
http://onsemi.com
5
Figure 9. Dropout Voltage
Figure 10. Short Circuit Current
010
20
30
40
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
1.0
0.5
0
t, TIME (µs)
Iout = 150 mA
CO = 0
TJ = 25°C
1.0
0
102030
40
t, TIME (µs)
Vin = 10 V
CO = 0
TJ = 25°C
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
1.5
0.5
0
Figure 11. Line Transient Response
Figure 12. Load Transient Response
2.5
2.0
1.5
1.0
0.5-90
-50
-10
30
70
110
150
190
TJ, JUNCTION TEMPERATURE (°C)
Iout = 3.0 A
Iout = 1.0 A
Iout = 0.5 A
∆Vout = 50 mV
8.0
6.0
4.0
2.0
0
5.0
10
15
20
25
Vin, INPUT VOLTAGE (Vdc)
TJ = 0°C
TJ = 25°C
TJ = 125°C
APPLICATIONS INFORMATION
Design Considerations
The LM323,A series of fixed voltage regulators are
designed with Thermal Overload Protection that shuts
down the circuit when subjected to an excessive power
overload condition, Internal Short Circuit Protection that
limits the maximum current the circuit will pass, and
Output Transistor Safe–Area Compensation that reduces
the output short circuit current as the voltage across the pass
transistor is increased.
In
many
low
current
applications,
compensation
capacitors are not required. However, it is recommended
that the regulator input be bypassed with a capacitor if the
regulator is connected to the power supply filter with long
wire lengths, or if the output load capacitance is large. An
input bypass capacitor should be selected to provide good
high–frequency characteristics to insure stable operation
under all load conditions. A 0.33
µF or larger tantalum,
mylar, or other capacitor having low internal impedance at
high frequencies should be chosen. The bypass capacitor
should be mounted with the shortest possible leads directly
across the regulator’s input terminals. Normally good
construction techniques should be used to minimize ground
loops and lead resistance drops since the regulator has no
external sense lead.




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