It is given in the datasheetHi,
2.5A RMS at 0.006 Ohms gives a dissipated power of 33mW... how can this give a 15°C temperature rise?
This means an R_th of about 450K/W.
Klaus
What brand and exact type? Are they suitable for your application? Datasheet?It is given in the datasheet
Hi,
What brand and exact type? Are they suitable for your application? Datasheet?
Klaus
That is interesting
The datasheet of #12 indeed shows a 15degc rise for 2.5a of ripple current....thats just 37mw of power.
A thermal resistance of over 400degc/watt.
We have discovered a different phenomina of heating in ceramic caps here.
I'd say this is due to eddy currents in the ceramic....or just the terribly poor thermal resistance of ceramic material.
Or maybe skin effect in the thin foil of the conductors in the cap.
And some proxmity effect in there too.
...or even all of the above.
It shows how MLCCs are pretty lousy with ripple current.
Then again, who cares about a 15degc rise....after all ceramic is very resilient to very high temperatures...unlike electro caps, ceramics can run at well over 125degc internal temp and still be fine for long life
As it is EV for Application in India, You can expect External Ambient Temp as high as 55 Degree Celcius. Internally it should be limited to 100 degree celcius at the worst case scenario.Yes i would have thought so...as attached shows max 13arms of input ripple ( i assumed 10uh inductor at 130khz).....but beware if your ambient is very high, the capacitance falls dramatically with temperature above 125degc, so the ripple will get much higher
Hii..Just to share some experience, I've never actually had the need to use electrolytic capacitors for any buck converter at such frequencies.
And also, an X7R cap in 0805 package can easily handle over 3 amps of current. With a 1210 size cap, I will be expecting over 6A capability to begin with.
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