Electronics > Beginners
Current limiter IC needed
Teun:
Hi all,
I'm working on a project which has 5 parallel outputs for charging handheld devices. I need to limit the current of every channel to +/-3.5A at 5V. Or 2A at 9V (roughly 18W). Can anyone recommend a good IC for this? Preferrably with little other components needed.
I tend to get a bit confused searching for these things. Do I need a "load switch" or "current limiter" or any other name these things might have?
ogden:
What is voltage of power supply? 18W is too much for simple linear current limiter because such would dissipate lot of heat. It means you need solution based on buck switching converter (voltage regulator) with current limiting function.
What you are looking for is something like http://www.ti.com/product/LM20343 which have both - adjustable output voltage and current
exe:
Do you need to limit current (CC mode), or to disconnect DUT from the power supply (e.g., e-fuse or something)?
Teun:
There is a big 90W power supply which will be divided in to 5 channels. So this is more of a distribution board.
Preferably I would like it to work in CC mode. But a disconnection with some sort of auto reset after a few seconds would be ok as well.
exe:
Not exactly what you asked, but may be still useful: https://www.st.com/en/power-management/e-fuses.html I didn't do much research if there are fuses with controllable re-arm time. In the worst case, you can add a 555 timer (monostable operation) to reset it after failure. I'd just use a power supply with CC mode, 90W on 5 channels doesn't sound much. Two three-output supplies should cover you.
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