bountyhunter
- Joined Sep 7, 2009
- 2,512
Power is as power does. The power in ANY linear circuit is:I tried this circuit & it works but I have a thermal issue with it. At any reasonable charge current 0.3 or 0.4A the LM317 overheats. It's probably because I'm running this from a 12V external DC supply
P = (Vin - Vout) X current
If you use a cheap buck switcher, you will have to modify it so that it does CC (constant current) when the batt voltage is below target value then goes into CV (con voltage) to hold it at the target value.