hussain_kiet
Full Member level 5
- Joined
- Mar 15, 2007
- Messages
- 260
- Helped
- 45
- Reputation
- 90
- Reaction score
- 28
- Trophy points
- 1,308
- Location
- Karachi, Pakistan
- Activity points
- 2,802
The LM317 is indeed an excellent current source. You can search the NS website for LM317 and look for 1A current regulator at page 17. What the internal circuit of the LM317 does is trying to keep the voltage at the adjust pin 1.2V below the voltage on the output pin. So, the voltage across the resistor in series with the load is also 1.2. Since I= U/R a current of 1A will flow in the load regardless of the voltage across the load. For an LM317 to maintain a constant current the input voltage has to Vout + 2.5V.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?