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PDF LM317M Data sheet ( Hoja de datos )
| Número de pieza | LM317M | |
| Descripción | 3-Terminal Adjustable Regulator | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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 1. Adjustable Voltage Regulator - TI  Hay una vista previa y un enlace de descarga de LM317M (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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LM317M
500 mA Adjustable Output,
Positive Voltage Regulator
The LM317M is an adjustable three−terminal positive voltage
regulator capable of supplying in excess of 500 mA over an output
voltage range of 1.2 V to 37 V. This voltage regulator is exceptionally
easy to use and requires only two external resistors to set the output
voltage. Further, it employs internal current limiting, thermal
shutdown and safe area compensation, making it essentially blow−out
proof.
The LM317M serves a wide variety of applications including local,
on−card regulation. This device also makes an especially simple
adjustable switching regulator, a programmable output regulator, or by
connecting a fixed resistor between the adjustment and output, the
LM317M can be used as a precision current regulator.
Features
• Output Current in Excess of 500 mA
• Output Adjustable between 1.2 V and 37 V
• Internal Thermal Overload Protection
• Internal Short Circuit Current Limiting
• Output Transistor Safe−Area Compensation
• Floating Operation for High Voltage Applications
• Eliminates Stocking Many Fixed Voltages
• Pb−Free Packages are Available
Vin
Vin
LM317M
Vout
Vout
*
Cin
0.1mF
IAdj Adjust
R1
240
**
+ CO
1.0mF
R2
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Heatsink surface
connected to Pin 2
TO−220AB
T SUFFIX
CASE 221A
SOT−223
ST SUFFIX
CASE 318E
1
2
3
1
23
DPAK
DT SUFFIX
CASE 369C
4
12
3
Heatsink Surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
PIN ASSIGNMENT
1 Adjust
2 Vout
3 Vin
* = Cin is required if regulator is located an appreciable distance from power supply filter.
** = CO is not needed for stability, however, it does improve transient response.
ǒ ǓVout + 1.25 V
1
)
R2
R1
) IAdj R2
Since IAdj is controlled to less than 100 mA, the error associated with this
term is negligible in most applications.
Figure 1. Simplified Application
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 13 of this data sheet.
© Semiconductor Components Industries, LLC, 2004
August, 2004 − Rev. 12
1
Publication Order Number:
LM317M/D
1 page  
LM317M
Vin
300 300
300
3.0k 300
70
350
6.8V
6.8V
18k
8.67k
130
200k
5.1k
500
400
180 180
6.3V
2.0k 6.0k
10
pF 10
pF
60
2.4k
12.8k
50
Figure 2. Representative Schematic Diagram
1.25
Vout
Adjust
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5
5 Page 
LM317M
+25V
Vin
LM317M
Vout R1
1.25k
VO
IO
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
R1 R2
Vin LM317M
Vout
Adjust
IAdj
Iout
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
ÎÎÎÎÎÎL 1.2 160
ÎÎÎÎÎÎ 0.8 120
Vertically
Minimum
Size Pad
2.0 oz. Copper
L 0.83
ÎÎÎÎÎÎÎÎL 0.63
ÎÎÎÎÎÎÎÎ0.50
50
RqJA
0.4 80
RqJA
0.42
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
http://onsemi.com
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LM317M.PDF ] | |
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