Timeline for RTC circuit supercapacitor charge/discharge doubts
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Oct 15, 2020 at 20:32 | comment | added | bunker89320 | That is correct. Thats a pretty high ESR though. | |
| Oct 15, 2020 at 20:09 | comment | added | abomin3v3l | thanks mate. My doubt is if the ESR of the supercap should be considered or not to calculate the charge current... for example, it has 150 ohms of ESR, so it would be not needed to add any extra resistor in series like my schematic shows, because that 150 ohms of ESR of the supercap it would limit the current in 22mA just by its ESR... Got? | |
| Oct 15, 2020 at 20:07 | vote | accept | abomin3v3l | ||
| Oct 15, 2020 at 19:06 | comment | added | bunker89320 | 150 ohms should be fine for just about any regulator. When the capacitor is at 0v, you will have an initial current of 22mA. That will continue to decrease the more the capacitor is charged. I would figure out how much current your regulator is able to handle. If its able to handle 1A, I'd use a 10ohm resistor which will give you a max current of 330mA and will charge the capacitor in about 10 seconds. With a 47ohm your max initial draw will be 70mA and charge time will be 46 seconds. | |
| Oct 15, 2020 at 16:02 | comment | added | abomin3v3l | Should I consider 150 ohms or 300 ohms? that's the main doubt... | |
| Oct 15, 2020 at 13:58 | history | answered | bunker89320 | CC BY-SA 4.0 |