LM317M_04 查看數據表（PDF） - ON Semiconductor
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LM317M_04 Datasheet PDF : 16 Pages
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LM317M
+25V
Vout R1
VO
IO
LM317M
Vin
1.25k
Adjust
* 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
IDSS
R1 =
Vref
IOmax + IDSS
VO < POV + 1.25 V + VSS
ILmin − IP < IO < 500 mA − IP
As shown O < IO < 495 mA
D1
R2
1N914
500
D2
1N914
1N5314
VSS*
Figure 21. Adjustable Current Limiter
D1
1N4002
Vin
Vout
Vin
LM317M
Vout
+
120
1.0mF
Adjust
720
MPS2222
1.0k
TTL
Control
Minimum Vout = 1.25 V
D1 protects the device during an input short circuit.
Figure 22. 5 V Electronic Shutdown Regulator
Vout
Vin
LM317M
Vout
240
1N4001
Adjust
R2
50k
MPS2907
+
10mF
Figure 23. Slow Turn−On Regulator
Iout
R1
R2
Vin
LM317M
Vout
Adjust
IAdj
Ioutmax =
Vref
R1 + R2
+
IAdj ^
1.25 V
R1 + R2
5.0 mA < Iout < 100 mA
Figure 24. Current Regulator
100
2.4 280
2.50
Free Air
PD(max) for TA = 50°C
Free Air
PD(max) for TA = 50°C
90
Mounted
2.0 240
Mounted
1.25
Vertically
80
Minimum
70
Size Pad
60
2.0 oz. Copper
L
1.6 200
ÎÎÎÎÎÎ L
1.2 160
ÎÎÎÎÎÎ 0.8 120
Vertically
Minimum
Size Pad
2.0 oz. Copper
L
0.83
ÎÎÎÎÎÎÎÎ L
0.63
ÎÎÎÎÎÎÎÎ0.50
50
RqJA
0.4 80
0.42
RqJA
40
0 40
0.35
0
5.0
10
15
20
25
30
0
5.0
10
15
20
25
30
L, LENGTH OF COPPER (mm)
L, LENGTH OF COPPER (mm)
Figure 25. DPAK Thermal Resistance and Maximum Figure 26. SOT−223 Thermal Resistance and Maximum
Power Dissipation versus PCB Copper Length
Power Dissipation versus PCB Copper Length
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