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MOSFET on/off switch

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Old 11-02-2017, 07:03 PM
  #1
rwh100
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Default MOSFET on/off switch

Here is a design for a very capable semiconductor on/off switch that can be built DYI and used with LiPos from 2s to 8s. Rated for 50 A continuous and 180 A peak.
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Old 11-03-2017, 03:48 PM
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jim billings
 
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I can't find a supplier with the DigiKey part number for the mosfet. Where did you purchase yours? I'll order from them if possible.

Jim B.
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Old 11-03-2017, 05:08 PM
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rwh100
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I ordered them from DigiKey. P/N IPB180N04S400ATMA1CT

I just checked and they have plenty of stock. Try cutting and pasting the text from the line above into the DigiKey search entry.

FYI: There are no Os in the part number, only zeros.

Let me know how that works...
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Old 11-03-2017, 07:27 PM
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jim billings
 
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Works fine! I had used a 1 (one) as the first character, not an I (eye?). Three on order and thanks a lot!

Jim
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Old 11-04-2017, 09:39 AM
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rwh100
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No problem. Let me know if you need any other information.

,,, and I'd like to see your results!
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Old 11-04-2017, 04:36 PM
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Jennifer Curtis
 
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Use a double pole switch for reliability, particularly
if you use the ESC to power the receiver.
Slide switches wipe themselves and may be
more reliable. Some toggle switches also wipe,
but some to not. You need to sacrifice one to
find out (take it apart to see how it works).

When the switch is on, this circuit will consume
1.5 mA from a 6s battery or 0.26 mA from a
3s battery. Its not a lot, but for a small battery
it could be important.

At 50 amps, the mosfet will dissipate 2.5 watts
of energy as heat, getting slightly warm. At 180
amps it will dissipate 31 watts, so it will get hot
very quickly. Peak current this high should be
VERY brief.

Jenny
.

Last edited by Jennifer Curtis; 11-04-2017 at 04:44 PM.
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Old 11-04-2017, 05:17 PM
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jim billings
 
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Thanks, Jenny (and RWH100.) My background is Electronics Engineer so I fully understand your advice. If I can help in any way (well - - - you know.)

jim
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Old 11-08-2017, 06:34 PM
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jim billings
 
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This is my version of your gadget (I use the XT60 connectors on all my planes.) This is the second one I built after building the first and testing it. Works fine and I don't need to build arming plugs/sockets to turn everything on, just a little bitty switch.

Thanks for publishing your design.

Jim B.
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Old 11-09-2017, 09:13 AM
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That's great, thanks for posting your results. Spread the word! Make e-planes spark free, safer, and more convenient for all.

My hope is that technically inclined club members would make more of these at cost to share with others.
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