Please forgive me for my ignorance but when it comes to Li-Po I am really not willing to take any risks.

I plan to implement a short circuit protection circuit on my PCB which is basically holding MCU, motor drivers, other ADC's and communication IC's. I am using a 6S lipo to power the full operation. My PCB is working fine. But given that during a short circuit there will be 100+ Amps of current flowing, I need some ideas on which circuits/IC's will help me design an efficient protection circuitry.


closed as too broad by PeterJ, Fizz, Daniel Grillo, hkBattousai, Dave Tweed Dec 1 '15 at 13:09

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    \$\begingroup\$ Maybe a simple fuse? \$\endgroup\$ – Icy Nov 19 '15 at 15:12
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    \$\begingroup\$ Does the 6S pack have any current limiting circuitry built-in to it? \$\endgroup\$ – mkeith Nov 19 '15 at 15:37
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    \$\begingroup\$ Probably this: ti.com/lit/ds/slusa08a/slusa08a.pdf \$\endgroup\$ – Fizz Nov 19 '15 at 15:59
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    \$\begingroup\$ If you have a LiPo pack with current capability of more than one or two amps, it needs to have the protection before there's any wires going elsewhere, or you are inviting explosions at some point in the future. There's a reason a car has a main fuse very close to the battery before anything else (with the possible exception of the starter relay in some cases, but you need to be aware of the level of testing and experience that goes into that bit). \$\endgroup\$ – Asmyldof Nov 19 '15 at 16:05
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    \$\begingroup\$ Two things: First, you need to protect the battery pack. That is outside the scope of this question (but check out the link from @RespawnedFluff). Second, a fuse should be fine to protect the PCB (it should only blow in the case that there is a fault). Fuses have a maximum interrupt rating. Make sure the maximum interrupt rating is higher than the battery pack short circuit current. Tiny PCB fuses may arc over after opening if the fault current is very high. Fuse closer to battery = good. You can also put a PCB fuse on the board in case it is powered from another source besides the battery. \$\endgroup\$ – mkeith Nov 19 '15 at 20:33

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