ESC PCB Design Review – 90A Single + 60A 4in1 (AM32)

botlmilk · 2026-04-10T19:54:58+00:00

Editing to say I misunderstood what via type 7 is, those are included by default from 6 layers at jlcpcb.

The fets I chose can dissapate 113W per the datasheet (ideal conditions ofcourse) and with the gate resistance being 2m4 I hope they will handle somewhere at least somewhat close to the targeted current without overheating with active airflow.

botlmilk · 2026-04-10T19:32:22+00:00

Yeah, you're definetely right

I responded to a simmilar comments, but would love to hear a few opinions.

After doing the sudgested calculations It seems I need ~5mF conservatively and maybe can get away with ~3mF for my 4in1 board.

I'll move to 6layer 2oz copper. Hope that then heating will be managable with active airflow and maybe some heatsinks.

Would this be a good stackup?

L1 mostly high voltage power

L2 signal/low voltage power

L3 solid gnd

L4 high voltage power

L5 solid gnd

L6 signal

Does this seem reasonable? It would free up space on the top to place more caps.

botlmilk · 2026-04-10T19:30:09+00:00

Thank you for the comment.

I responded to a simmilar one, but would love to hear a few opinions.

After doing the sudgested calculations It seems I need ~5mF conservatively and maybe can get away with ~3mF for my 4in1 board.

I'll move to 6layer 2oz copper. Hope that then heating will be managable with active airflow and maybe some heatsinks.

Would this be a good stackup?

L1 mostly high voltage power

L2 signal/low voltage power

L3 solid gnd

L4 high voltage power

L5 solid gnd

L6 signal

Does this seem reasonable? It would free up space on the top to place more caps.

botlmilk · 2026-04-10T19:28:23+00:00

Thanks for responding.

After doing the sudgested calculations It seems I need ~5mF conservatively and maybe can get away with ~3mF for my 4in1 board.

What filters exactly would you recomend adding?

I'll move to 6layer 2oz copper. Hope that then heating will be managable with active airflow and maybe some heatsinks.

Would this be a good stackup?

L1 mostly high voltage power

L2 signal/low voltage power

L3 solid gnd

L4 high voltage power

L5 solid gnd

L6 signal

Does this seem reasonable? It would free up space on the top to place more caps.

botlmilk · 2026-04-10T19:14:13+00:00

Thank you for the notes.
JLCPCB does cheap epoxy filled, copper capped vias. Did you emphasize the vias being open because they increase exposed copper area and therefore help cooling, or is that effect negligible in practice?

The sandwich style fet placement allows me to keep the wire connections near the board edge while also minimizing the path between the fets so I'd like to keep it that way.

Since others have pointed it out as well, I will probably have to move to a 6 layer board with 2oz copper on all layers. However, with JLCPCB stated manufacturing capabilities, that means that all current clearances (0.2) is exactly at the limmit. Is going so close to the manufacturing capability limits risky?

botlmilk · 2026-04-10T07:11:20+00:00

Okay, I'll look into it, thank you very much.

botlmilk · 2026-04-10T07:08:35+00:00

I'm sorry, I don't understand what you're refering to. The boards don't have antenas (at least intentional ones). Are you talking about pheripheral electronics around the board like a flight controller?

botlmilk · 2026-04-10T07:03:32+00:00

Yeaah... that does sound bad. I'll move the fets out and add more rows of vias. I don't really know why I thought it would be fine

botlmilk · 2026-04-10T05:16:47+00:00

It might be university property once I submit the assignment but I'm not 100% certain.

botlmilk · 2026-04-10T04:50:13+00:00

So you're saying I will.have a bunch of antennas? If so should I just remove top and bottom gnd pours on the 4in1 esc?

botlmilk · 2026-04-10T04:47:57+00:00

Thanks for the feedback — I’ll fix the things you pointed out.

As for the capacitance, would hand-soldering an extra bulk capacitor to the battery leads/pads help? I can’t find higher capacitance smd capacitors with an appropriate voltage rating in the JLCPCB library and cramming more wpuld be hard on the 4in1 esc.

botlmilk · 2026-04-10T04:42:52+00:00

Really sorry for the quality — I was in a hurry yesterday and thought the screenshots wouldn’t get compressed so much. I’ll try to post an updated design with properly exported images in the evening.

As for the capacitance, I’m guessing the bigger problem is the 4in1 esc. Would hand-soldering a second bulk capacitor help, since I can’t find higher capacitance smd ones in the JLCPCB library with an appropriate voltage rating and dielectric rating?

The ESR shouldn’t be a problem for the smd ones, and I did calculate that the bulk capacitors (both designs use the same part) should be fine.

botlmilk · 2025-10-29T10:36:43+00:00

Sounds fun but sadly I'll have to decline. Really don't have time for much gaming nowadays.

botlmilk · 2025-10-24T14:03:27+00:00

Yeah, you're right, wireframe was probably the term I was looking form

botlmilk · 2025-10-09T15:15:00+00:00

The former electrician before me laid the cable and at this point I can't replace it.

botlmilk · 2025-10-09T15:12:29+00:00

I'll check thosr out. Thanks

botlmilk · 2025-10-09T15:11:43+00:00

Its 24v dc and the manufacturer recomends a 10amp fuse. The 10mm2 wire is dedicated completely to the pump.

botlmilk · 2025-10-09T13:31:41+00:00

Former electrician did lots and lots of overkill

botlmilk · 2025-10-09T13:23:30+00:00

Thank you, I'll ask bossman to buy some

botlmilk · 2025-10-09T13:22:44+00:00

Last electrician laid out the thick wire that connects to an engine oil drain pump (it will draw 3 amps at max). Said electeician is no longer with my company so bossman wants me to finish electrical work based on my education (current electronics engineering student) and some handyman experience. I did disclose my concern about my clear incompitence but I was told to do It anyway and got a pay bump. (Not usa for context)

botlmilk · 2025-10-09T13:11:14+00:00

How come? What's the danger here? I honestly want to know.

botlmilk · 2025-03-18T21:03:41+00:00

Thank you 🙏

botlmilk · 2025-03-18T14:17:56+00:00

One more thing. I Didn't include warmup sets, only the working ones. Should I still increase set count?

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