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Multiple LL N-Channel MOSFET's in Series

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Ice-Tea:
LTSpice

TheDood:
Thanks @Ice-Tea I'll check it out

Can you or someone help me find the ESR for the 2.2μF capacitor on this data sheet?

mzzj:

--- Quote from: TheDood on August 26, 2019, 05:44:08 am ---Thanks @Ice-Tea I'll check it out

Can you or someone help me find the ESR for the 2.2μF capacitor on this data sheet?


--- End quote ---
15-20 milliohms guessed from impedance graphs.

TheDood:

--- Quote from: mzzj on August 26, 2019, 03:41:03 pm ---
--- Quote from: TheDood on August 26, 2019, 05:44:08 am ---Thanks @Ice-Tea I'll check it out

Can you or someone help me find the ESR for the 2.2μF capacitor on this data sheet?


--- End quote ---
15-20 milliohms guessed from impedance graphs.

--- End quote ---
Thanks, could you help me understand how you are calculating/guesstimating?

I've been finding the Xc per Hz but when I plug into a 305V cct I get pretty much the exact figures that are plotted on the Irms charts.

I was trying to note the perceived minor differences in the calculated ideal current and the plotted current, then solving for R in each scenario, and chalking up any differences in R to ESR, but I'm nowhere near precise enough. It seems I'm getting whole R values not 10s of mΩ values and not really sure this is what you were meaning?

Example:
2.2μF, @ 800Hz

Xc = 1 / ( 2×3.14×800×0.0000022)
Xc = 90.42Ω

I = 305 / Xc
I = 3.37A

Chart looks maybe closer to only 3.3A???

(305V / 3.3A) - (305V / 3.37A)
=

mzzj:

--- Quote from: TheDood on August 26, 2019, 07:22:06 pm ---
--- Quote from: mzzj on August 26, 2019, 03:41:03 pm ---
--- Quote from: TheDood on August 26, 2019, 05:44:08 am ---Thanks @Ice-Tea I'll check it out

Can you or someone help me find the ESR for the 2.2μF capacitor on this data sheet?


--- End quote ---
15-20 milliohms guessed from impedance graphs.

--- End quote ---
Thanks, could you help me understand how you are calculating/guesstimating?


--- End quote ---
Lowest dip in the impedance graph is indication of the ESR, ignore frequency and ignore the Irms charts. (page 12 Impedance Z versus frequency f)
Not by any means 100% accurate method but better than nothing. 

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