LM323 데이터 시트보기 (PDF) - Motorola => Freescale
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LM323 Datasheet PDF : 8 Pages
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Figure 13. Current Regulator
LM323, A
Figure 14. Adjustable Output Regulator
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
^IB 3.5 mA
For example, a 2.0 A current source would require R to be a 2.5 Ω,
15 W resistor and the output voltage compliance would be the input
voltage less 7.5 V.
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 15. Current Boost 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 conjuction 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 16. Current Boost with
Short Circuit Protection
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.
6
MOTOROLA ANALOG IC DEVICE DATA
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