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LM323_02 Datasheet(PDF) 6 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
6
Figure 13. Current Regulator
Figure 14. Adjustable Output Regulator
Figure 15. Current Boost Regulator
Figure 16. Current Boost with
Short Circuit Protection
5.0 V
R
Input
0.33µF
LM323, A
R
IO
The LM323,A regulator can also be used as a current source when
connected as above. Resistor R determines the current as follows:
IO =
+ IB
∆IB ^ 0.7 mA over line, load and temperature changes
IB ^ 3.5 mA
For example, a 2.0 A current source would require R to be a 2.5 Ω,
15W resistor and the output voltage compliance would be the input
voltage less 7.5 V.
Constant
Current to
Grounded Load
Input
Output
1.0k
4
6
7
2
3
-
+
0.1µF
10k
MC1741
VO, 8.0 V to 20 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.
LM323, A
0.33µF
R
0.1µF
Output
1.0µF
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.
2N4398 or Equiv
LM323, A
LM323, A
Input
Rsc
2N4398
or Equiv.
Output
R
MJ2955
or Equiv.
1.0µF
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.
Vin - VO ≥ 2.5 V




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