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PDF 317B Data sheet ( Hoja de datos )
| Número de pieza | 317B | |
| Descripción | THREE.TERMINAL ADJUSTABLE POSITIVE VOLTAGE REGULATOR | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Order this document by LM317/D
Three-Terminal Adjustable
Output Positive Voltage
Regulator
The LM317 is an adjustable 3–terminal positive voltage regulator capable
of supplying in excess of 1.5 A 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 LM317 serves a wide variety of applications including local, on card
regulation. This device can also be used to make a programmable output
regulator, or by connecting a fixed resistor between the adjustment and
output, the LM317 can be used as a precision current regulator.
• Output Current in Excess of 1.5 A
• Output Adjustable between 1.2 V and 37 V
• Internal Thermal Overload Protection
• Internal Short Circuit Current Limiting Constant with Temperature
• Output Transistor Safe–Area Compensation
• Floating Operation for High Voltage Applications
• Available in Surface Mount D2PAK, and Standard 3–Lead Transistor
Package
• Eliminates Stocking many Fixed Voltages
LM317
THREE–TERMINAL
ADJUSTABLE POSITIVE
VOLTAGE REGULATOR
SEMICONDUCTOR
TECHNICAL DATA
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Heatsink surface
connected to Pin 2.
1
2
3
Vin
Cin*
0.1 µF
Standard Application
LM317
IAdj Adjust
Vout
R1
240
+ CO**
1.0 µF
R2
+ ǒ ) Ǔ )** 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.
Vout
1.25 V 1
R2
R1
IAdj R2
Since IAdj is controlled to less than 100 µA, the error associated with this term is
negligible in most applications.
MOTOROLA ANALOG IC DEVICE DATA
Pin 1. Adjust
2. Vout
3. Vin
D2T SUFFIX
PLASTIC PACKAGE
CASE 936
(D2PAK)
12
3
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
LM317BD2T
Surface Mount
TJ = – 40° to +125°C
LM317BT
Insertion Mount
LM317D2T
LM317T
Surface Mount
TJ = 0° to +125°C Insertion Mount
© Motorola, Inc. 1996
Rev 1
1
1 page  
LM317
Figure 5. Load Regulation
0.4
0.2
0
–0.2
–0.4
–0.6
Vin = 15 V
Vout = 10 V
–0.8
IL = 0.5 A
IL = 1.5 A
–1.0
–50 –25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (°C)
Figure 6. Current Limit
4.0
3.0
TJ = 25°C
2.0
150°C
1.0
55°C
0
0 10 20 30 40
Vin–Vout, INPUT–OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
Figure 7. Adjustment Pin Current
70
65
60
55
50
45
40
35
–50 –25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (°C)
Figure 8. Dropout Voltage
3.0
∆Vout = 100 mV
2.5
IL = 1.5 A
1.0 A
2.0
500 mA
1.5
200 mA
20 mA
1.0
–50 –25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (°C)
Figure 9. Temperature Stability
1.26
1.25
1.24
1.23
1.22
–50 –25 0 25 50 75 100 125 150
TJ, JUNCTION TEMPERATURE (°C)
Figure 10. Minimum Operating Current
5.0
4.5
TJ = –55°C
4.0
3.5 +25°C
3.0 +150°C
2.5
2.0
1.5
1.0
0.5
0
0 10 20 30 40
Vin–Vout, INPUT–OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
MOTOROLA ANALOG IC DEVICE DATA
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet 317B.PDF ] | |
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