LM317M_99 Ver la hoja de datos (PDF) - ON Semiconductor
Número de pieza
componentes Descripción
Fabricante
LM317M_99 Datasheet PDF : 12 Pages
| |||
LM317M
Figure 19. Adjustable Current Limiter
+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
D1
R2
1N914
500
D2
1N914
1N5314
VSS*
VO < POV + 1.25 V + VSS
ILmin – IP < IO < 500 mA – IP
As shown O < IO < 495 mA
Figure 21. Slow Turn–On Regulator
Vout
Vin
LM317M
Vout
240
1N4001
Adjust
R2
50k
MPS2907
+
10µF
Figure 20. 5 V Electronic Shutdown Regulator
D1
1N4002
Vin
Vout
Vin
LM317M
Vout
+
120
1.0µF
Adjust
720
MPS2222
1.0k
TTL
Control
Minimum Vout = 1.25 V
D1 protects the device during an input short circuit.
Figure 22. Current 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 23. DPAK Thermal Resistance and Maximum Figure 24. SOT–223 Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
Power Dissipation versus P.C.B. Copper Length
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
0.4 80
0.42
RθJA
RθJA
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)
http://onsemi.com
9
Share Link: 