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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) = 2Ω |
| 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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