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PDF LM317M Data sheet ( Hoja de datos )
| Número de pieza | LM317M | |
| Descripción | 500mA, Positive Voltage 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 14 Páginas | ||
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LM317M, NCV317MA,
NCV317M
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
• NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q100
Qualified and PPAP Capable
• These are Pb−Free Devices
Vin
Vin
LM317M
Vout
Vout
*
Cin
0.1mF
IAdj Adjust
R1
240
**
+ CO
1.0mF
R2
* = 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
© Semiconductor Components Industries, LLC, 2014
August, 2014 − Rev. 24
1
http://onsemi.com
Heatsink surface
connected to Pin 2
TO−220AB
T SUFFIX
CASE 221AB
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
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 11 of this data sheet.
Publication Order Number:
LM317M/D
1 page  
Vin Vin
Cin 0.1mF
LM317M, NCV317MA, NCV317M
LM317M
Load Regulation (mV) = VO (min Load) -VO (max Load)
VO (min Load) - VO (max Load)
Load Regulation (% VO) =
VO (min Load)
X 100
Vout
IL
VO (min Load)
VO (max Load)
Adjust
IAdj
240
R1 1%
+
CO 1.0mF
RL
(max Load)
*
RL
(min Load)
* Pulse Testing Required:
1% Duty Cycle is suggested.
R2
1%
Figure 4. Load Regulation and DIAdj/Load Test Circuit
Vin
VI
Cin 0.1mF
*Pulse Testing Required:
1% Duty Cycle is suggested.
LM317M
Vout
IL
Adjust
IAdj
R1
240
1%
Vref
ISET
R2
1%
To Calculate R2:
Vout = ISET R2 + 1.250 V
Assume ISET = 5.25 mA
Figure 5. Standard Test Circuit
+
CO 1mF
RL
VO
24V
14V
f = 120 Hz
Vin Vout
LM317M
Vout = 10 V
Cin 0.1mF
Adjust
R1
240
1%
D1 *
1N4002
CO
+
1.0mF
RL
VO
R2
1.65K
1%
** +
CAdj 10mF
* D1 Discharges CAdj if Output is Shorted to Ground.
**CAdj provides an AC ground to the adjust pin.
Figure 6. Ripple Rejection Test Circuit
http://onsemi.com
5
5 Page 
LM317M, NCV317MA, NCV317M
MARKING DIAGRAMS
DPAK
DT SUFFIX
CASE 369C
317ABG
ALYWW
317MAG
ALYWW
317MBG
ALYWW
317MG
ALYWW
TO−220
T SUFFIX
CASE 221A
LM
317MABT
AWLYWWG
LM
317MBT
AWLYWWG
LM
317MT
AWLYWWG
AYW
317MA G
G
SOT−223
ST SUFFIX
CASE 318E
AYW
317MB G
G
AYW
317M G
G
A
L, WL
Y
WW, W
G or G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
http://onsemi.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LM317M.PDF ] | |
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