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LM317 Datasheet(PDF) 9 Page - ON Semiconductor

Part # LM317
Description  1.5 A Adjustable Output, Positive Voltage Regulator
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LM317 Datasheet(HTML) 9 Page - ON Semiconductor

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LM317
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9
Figure 21. Adjustable Current Limiter
Figure 22. 5.0 V Electronic Shutdown Regulator
Vref
+25 V
Vin
LM317
Vout
R1
1.25
Adjust
Iout
D2
1N4001
2N5640
R2
100
* To provide current limiting of IO to the system
* ground, the source of the FET must be tied to a
* negative voltage below - 1.25 V.
R2 ≤
Vref
R1 =
VSS*
D1
1N4001
VO < BVDSS + 1.25 V + VSS,
ILmin - IDSS < IO < 1.5 A.
As shown 0 < IO < 1.0 A.
Vin
D1*
1N4002
Vout
120
Adjust
720
+
1.0 µF
MPS2222
1.0 k
TTL
Control
LM317
Minimum Vout = 1.25 V
* D1 protects the device during an input short circuit.
IOmax + IDSS
IDDS
Figure 23. Slow Turn–On Regulator
Figure 24. Current Regulator
+ 1.25V
R1
+
10 µF
Vin
Vout
240
1N4001
LM317
Adjust
MPS2907
R2
50 k
LM317
Vin
Vout R1
Adjust
IAdj
Iout
10 mA ≤ Iout ≤ 1.5 A
Iout +
Vref
R1
) IAdj


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