Datenblatt-pdf.com


LM323 Schematic ( PDF Datasheet ) - ON Semiconductor

Teilenummer LM323
Beschreibung 3A, Positive Voltage Regulator
Hersteller ON Semiconductor
Logo ON Semiconductor Logo 




Gesamt 8 Seiten
LM323 Datasheet, Funktion
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






LM323 Datasheet, Funktion
LM323, LM323A
Input
0.33µF
LM323, A
R
Constant
Current to
IO Grounded Load
The LM323,A regulator can also be used as a current source when
connected as above. Resistor R determines the current as follows:
IO =
5.0 V
R
+ IB
IB ^ 0.7 mA over line, load and temperature changes
ăIB ^ 3.5 mA
For example, a 2.0 A current source would require R to be a 2.5Ă,
15ăW resistor and the output voltage compliance would be the input
voltage less 7.5 V.
Figure 13. Current Regulator
LM323, A
Input
0.33µF
1.0k
7 -2
6
MC1741
+3
4
Output
0.1µF
10k
VO, 8.0 V to 20 V
Vin - VO 2.5 V
The addition of an operational amplifier allows adjustment to higher or
intermediate values while retaining regulation characteristics. The
minimum voltage obtainable with this arrangement is 3.0 V greater
than the regulator voltage.
Figure 14. Adjustable Output Regulator
2N4398 or Equiv
R
1.0µF
LM323, A
Output
0.1µF
The LM323, A series can be current boosted with a PNP transistor. The
2N4398 provides current to 15 A. Resistor R in conjunction with the VBE
of the PNP determines when the pass transistor begins conducting; this
circuit is not short circuit proof. Input-output differential voltage
minimum is increased by the VBE of the pass transistor.
Figure 15. Current Boost Regulator
2N4398
Input Rsc or Equiv.
MJ2955
or Equiv.
R
1.0µF
LM323, A
Output
The circuit of Figure 16 can be modified to provide supply protection
against short circuits by adding a short circuit sense resistor, RSC, and
an additional PNP transistor. The current sensing PNP must be able to
handle the short circuit current of the three-terminal regulator.
Therefore, an 8.0 A power transistor is specified.
Figure 16. Current Boost with
Short Circuit Protection
http://onsemi.com
6

6 Page







SeitenGesamt 8 Seiten
PDF Download[ LM323 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
LM323-Terminal Negative RegulatorsNational Semiconductor
National Semiconductor
LM32Low Power Single Op AmpNational Semiconductor
National Semiconductor
LM32Dual Voltage RegulatorNational Semiconductor
National Semiconductor
LM32Series 3-Terminal Negative RegulatorsNational Semiconductor
National Semiconductor
LM32Precision TimersNational Semiconductor
National Semiconductor

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche