LM317 voltage regulators

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  Posted by momename - July 31, 2013 at 12:51 am

In the event of we need to build a variable DC power supply that output of 1A and can adjust up to about 30V.
Most people will use LM317 because high-efficiency, easy to apply and cheaper

Description
It have an adjustable 3-terminal positive voltage regulator designed to supply more than 1.5 A of load current with an output voltage adjustable over a 1.2V to 37V range.
It has a internal current limiting, temperature detect shutdown, and safe area compensation.

pin to use lm317-to-220
Figure 1 pin to use LM317

Features
-Output current in excess of 1.5A
-Output-Adjustable between 1.2V and 37V
-Internal Short-Circuit Current Limiting or Output is short-circuit protected
-Internal Thermal Overload Protection or Current limit constant with temperature
-Output-Transistor Safe Operating Area Compensation
-TO-220 Package like 2SC1061 transistors.
-There are 1% output voltage Durability
-There are max. 0.01%/V line regulation(LM317), and 0.3% load regulation (LM117)
-There are 80 dB ripple rejection
typical-application-of-lm317
Figure 2 the basic circuit diagram

Basic circuit diagram
If power supply filter has distance from IC-regulator too much, should insert Ci to lower noise before IC-input. Next in figure circuit, Co is not needs if you do not high-efficiency, but we put it better, it is use for lower a output ripple.

As Iadj is controlled to less than 100uA, the little error Unimportant in most applications.

The input voltage to the LM317 must be at least 1.5v greater than the output voltage.

For example circuits :

  1. Variable DC Power Supply 1.2V to 30V 1A First projects
  2. LM317 Linear power supply Regulator selector 1.5V,3V,4.5V,5V,6V,9V 1.5A It’s easy to selects voltage output.
  3. 0-60 volt DC variable power supply using LM317&LM337 It’s high volt and start voltage at zero! good job.
  4. Best DC power supply 3Amp to adjust 1.2V-20V & 3V-6V-9V-12V High current for all circuit easy to use.
  5. Dual power supply 3V,5V,6V,9V,12,15V with LM317,LM337There positve and negative voltage output for all circuit easy to use.
  6. LM338 / LM350 / LM317 VOLTAGE REGULATOR CALCULATOR
  7. USB Battery Replacement by LM317
  8. Low dropout 5v regulator using LM317
  9. The most lead-acid battery charger circuits
  10. Nicad Battery Charger by IC LM317T
  11. Note:
    You can buy LM317 at amozon with list below:


    10PCS L317 LM317 LM317T 317 TO-220 Voltage Regulator 1.2V To 37V 1.5A


    Thermal Overload Protection LM317 Voltage Regulator 25 Pcs


    LM317 Voltage Regulator IC 1.2V to 37V 1.5A