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PDF LM323 Data sheet ( Hoja de datos )
| Número de pieza | LM323 | |
| Descripción | 3A, Positive Voltage Regulator | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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 1. 5V, Voltage Regulator - Onsemi  Hay una vista previa y un enlace de descarga de LM323 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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ON Semiconductort
3.0 A Positive Voltage
Regulators
The LM323,A are monolithic integrated circuits which supply a
fixed positive 5.0 V output with a load driving capability in excess of
3.0 A. These three–terminal regulators employ internal current
limiting, thermal shutdown, and safe–area compensation. The
A–suffix is an improved device with superior electrical
characteristics and a 2% output voltage tolerance. These regulators
are offered with a 0° to +125°C temperature range in a low cost
plastic power package.
Although designed primarily as a fixed voltage regulator, these
devices can be used with external components to obtain adjustable
voltages and currents. These devices can be used with a series pass
transistor to supply up to 15 A at 5.0 V.
• Output Current in Excess of 3.0 A
• Available with 2% Output Voltage Tolerance
• No External Components Required
• Internal Thermal Overload Protection
• Internal Short Circuit Current Limiting
• Output Transistor Safe–Area Compensation
• Thermal Regulation and Ripple Rejection Have Specified Limits
LM323, LM323A
3–AMPERE, 5 VOLT
POSITIVE
VOLTAGE REGULATORS
SEMICONDUCTOR
TECHNICAL DATA
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Pin 1. Input
2. Ground
3. Output
1
2
3
Heatsink surface is connected to Pin 2.
Simplified Application
Input
Cin*
0.33µF
LM323, A
Output
CO**
ORDERING INFORMATION
Output
Voltage
Device Tolerance
Operating
Temperature
Range
Package
LM323T
LM323AT
4%
2%
TJ = 0° to +125°C
Plastic
Power
A common ground is required between the input and the output voltages. The
input voltage must remain typically 2.5 V above the output voltage even during
the low point on the input ripple voltage.
*Cin is required if regulator is located an appreciable
*distance from power supply filter. (See Applications
*Information for details.)
**CO is not needed for stability; however, it does
**improve transient response.
© Semiconductor Components Industries, LLC, 2002
January, 2002 – Rev. 2
1
Publication Order Number:
LM323/D
1 page  
LM323, LM323A
2.5 8.0
Iout = 3.0 A
2.0 6.0
1.5 Iout = 1.0 A
Iout = 0.5 A
1.0
∆Vout = 50 mV
0.5-90
-50 -10 30 70 110 150
TJ, JUNCTION TEMPERATURE (°C)
Figure 9. Dropout Voltage
190
4.0
2.0
0
5.0
TJ = 0°C
TJ = 25°C
TJ = 125°C
10 15 20
Vin, INPUT VOLTAGE (Vdc)
Figure 10. Short Circuit Current
25
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
1.0
0.5
00
Iout = 150 mA
CO = 0
TJ = 25°C
10 20
t, TIME (µs)
30
40
Figure 11. Line Transient Response
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
1.5
1.0
0.5
00
Vin = 10 V
CO = 0
TJ = 25°C
10 20 30
t, TIME (µs)
40
Figure 12. Load Transient Response
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.
http://onsemi.com
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LM323.PDF ] | |
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