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Electronic speed controller for Drones

Thanh
Associate

‎2024-05-13 09:40 PM - last edited on ‎2024-07-10 06:15 AM by

I'm designing an ESC for a drone. I found STM's UM2197 design document. I have a question why this DC link capacitor design uses 2 Capacitors in parallel (P/N 35ZLH330MEFC10X12.5) of Rubycon.
This capacitor has the following parameters:

Ripple Current @ High Frequency: 1.33 A @ 100 kHz

Ripple Current @ Low Frequency: 731.5 mA @ 120 Hz

Capacitance: 330 µF
I want to ask why STM chose this capacitor?

As I calculated, the ripple current through the DC link capacitor is much higher than the ripple current through the selected STM capacitor.

Thanh_0-1715661341872.png

 

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Peter BENSCH
ST Employee

‎2024-07-10 06:17 AM

Welcome @Thanh, to the community!

Unfortunately, you posted your question in the wrong forum, so it could only be found by chance.

I assume that the colleagues used two capacitors in parallel for reasons of space and perhaps also for current distribution.

Hope that still helps?

Regards
/Peter

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