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LM317M 데이터시트(PDF) 11 Page - ON Semiconductor

부품명 LM317M
상세설명  Three-Terminal Adjustable Output Positive Voltage Regulator
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제조업체  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LM317M 데이터시트(HTML) 11 Page - ON Semiconductor

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LM317M
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Figure 21. Adjustable Current Limiter
Figure 22. 5 V Electronic Shutdown Regulator
Figure 23. Slow Turn−On Regulator
Figure 24. Current Regulator
Vref
+25V
Vin
LM317M
Vout
R1
VO
1.25k
Adjust
IO
D2
1N914
1N5314
R2
500
* To provide current limiting of IO
to the system ground, the source of
the current limiting diode must be tied to
a negative voltage below −7.25 V.
R2
Vref
R1 =
VSS*
D1
1N914
VO < POV + 1.25 V + VSS
ILmin − IP < IO < 500 mA − IP
As shown O < IO < 495 mA
+
10
mF
Vin
Vout
240
1N4001
LM317M
Adjust
MPS2907
R2
50k
Vin
D1
1N4002
Vout
120
Adjust
720
+
1.0
mF
MPS2222
1.0k
TTL
Control
LM317M
Minimum Vout = 1.25 V
D1 protects the device during an input short circuit.
LM317M
Vin
R1
R2
Adjust
IAdj
Iout
5.0 mA < Iout < 100 mA
Vout
Ioutmax =
Vref
+ IAdj ^
1.25 V
R1 + R2
Vout
Vout
Vin
IDSS
IOmax + IDSS
R1 + R2
40
50
60
70
80
90
100
0
0.4
0.8
1.2
1.6
2.0
2.4
010
20
30
25
15
5.0
L, LENGTH OF COPPER (mm)
PD(max) for TA = 50°C
Minimum
Size Pad
L
L
Free Air
Mounted
Vertically
RqJA
2.0 oz. Copper
Figure 25. DPAK Thermal Resistance and Maximum
Power Dissipation versus PCB Copper Length
Figure 26. SOT−223 Thermal Resistance and Maximum
Power Dissipation versus PCB Copper Length
40
80
120
160
200
240
280
0.35
0.42
0.50
0.63
0.83
1.25
2.50
010
20
30
25
15
5.0
L, LENGTH OF COPPER (mm)
PD(max) for TA = 50°C
Minimum
Size Pad
L
L
Free Air
Mounted
Vertically
RqJA
2.0 oz. Copper


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