LM317CM Vishay, LM317CM Datasheet

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LM317CM

Manufacturer Part Number
LM317CM
Description
3-terminal Adjustable Output Positive Voltage Regulators
Manufacturer
Vishay
Datasheet
Document Number 74809
29-Nov-01
(LM317CT)
Notes:
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.
V
Since I
term is negligible in most applications
Maximum Ratings
Parameter
Input-Output Voltage Differential
Power Dissipation, 25°C Free-Air Temperature
Power Dissipation, 25°C Case Temperature
Operating Junction Temperature Range
Storage Junction Temperature Range
TO-220
Input
out
0.1 F
3
= 1.25V (1 + R
C
in
Adj
Reference
is controlled to less than 100 A, the error associated with this
Voltage
V
in
3-Terminal Adjustable Output Positive Voltage Regulators
1
Functional Block Diagram
Vadj
2
/ R
Standard Application
1
) + I
1
Adj
I
2
ADJ
+
--
R2
3
LM317
Adjust
1. Adjust
2. V
3. V
Heatsink is connected to pin 2
R2
Protection
Ratings at 25°C ambient temperature unless otherwise specified.
Circuitry
out
in
Pin Arrangement
1
240
2
R1
3
(LM317CM)
TO-263
V
out
1 F
C
Output
o
Rlimit
New Product
2
Symbol
V
Description
The LM317 is an adjustable 3-terminal positive voltage
regulator capable of supplying in excess of 1.5A over an
output voltage range of 1.2V to 37V. 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 compen-
sation, making it essentially blow-out proof.
Features
• Output current in excess of 1.5 ampere
• Output adjustable between 1.2V and 37V
• 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
Mechanical Data
Case: TO-220 and TO-263 packages
Weight: approx. 1.35g
Case outlines are on the back page.
T
P
P
i
T
constant with temperature
-V
stg
D
D
J
o
LM317CM & LM317CT
–65 to +150
0 to +125
Value
Vishay Semiconductor
40
15
2
www.vishay.com
Unit
Vdc
W
W
C
C
1

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LM317CM Summary of contents

Page 1

... Eliminates stocking many fixed voltages Mechanical Data Case: TO-220 and TO-263 packages Weight: approx. 1.35g Case outlines are on the back page. Rlimit 2 Output Symbol stg LM317CM & LM317CT Vishay Semiconductor Value Unit 40 Vdc +125 C –65 to +150 C www.vishay.com 1 ...

Page 2

... Part Number Vishay Semiconductor Electrical Characteristics – LM317 5V 0.5A low to high Parameter (3) Line Regulation (Fig. 1) 3.0V V – V 40V I o (3) Load Regulation (Fig 25°C, 10mA I 1. (3) Load Regulation (Fig. 2) 10mA I 1.5A o Thermal Regulation Adjustment Pin Current (Fig ...

Page 3

... 0 Calculate R2 1.250V D1 Discharges C * SET Assume I = 5.25mA Output is Shorted to Ground SET Part Number Vishay Semiconductor Fig. 2 – Load Regulation and I /Load Test Circuit adj Vo(min. Load) -- Vo(max. Load) x100 Vo(min. Load) V out I LM317 L 240 Adjust ...

Page 4

... Part Number Vishay Semiconductor Ratings and Characteristic Curves (T Fig. 5 – Load Regulation 0.6 0.6 0.4 0.4 0.2 0 --0.2 --0 1.5A L --0.4 --0 15V I --0.6 --0 10V o --0.8 --0.8 --1.0 --1.0 --75 --50 --25 --75 --50 -- Fig. 7 – Adjustment Pin Current --75 --50 -- Fig. 9 – Temperature Stability 1 ...

Page 5

... --1 --2 --3 1.5 Adj 1.0 0 Part Number Vishay Semiconductor Fig. 12 – Ripple Rejection vs. Output Current Adj Without C Adj V = 15V 10V f = 120H 0 Output Current (A) o Fig. 14 – Output Impedance V = 15V ...

Page 6

... Part Number Vishay Semiconductor 10.25 13.9 0.41 2.53 0.185 1.65 20 2.54 www.vishay.com 6 TO-220 Case Outline 0.25 3.84 0.6 Dia. 2.69 0.25 6.26 0.25 14.8 0.51 8.54 0.26 3.94 0.375 Dimensions in millimeters 1.3 0.185 0.387 0.09 0.8 0.12 TO-263 Case Outline 10.29 9.14 15.24 8 Max. 1.27 0.38 Dimensions in millimeters 4.85 0.375 1.27 0.12 28.7 0.92 2.55 0.375 4.47 1.27 Seating Plane .10 2.54 Document Number 74809 29-Nov-01 ...

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