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| Measure capacitor for ESL and ESR and C over frequency |
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| Faringdon:
Hi, Whats the cheapest equipment to get this measurement done? (LTspice and PNG attached).....capacitor is electrolytic of 470uf, 50v, and also we need it for MLCC of 10uf, 50v, x7r. As you know, we find the frequency of the "valley"....then at that point, 1/wC = wL. -From this we can work out the ESL , since capacitance does not change with frequency. |
| tggzzz:
--- Quote from: Faringdon on May 03, 2024, 05:54:44 am ---Hi, Whats the cheapest equipment to get this measurement done? (LTspice and PNG attached).....capacitor is electrolytic of 470uf, 50v, and also we need it for MLCC of 10uf, 50v, x7r. As you know, we find the frequency of the "valley"....then at that point, 1/wC = wL. -From this we can work out the ESL , since capacitance does not change with frequency. --- End quote --- Signal generator and AC voltmeter, or oscilloscope. If your company doesn't have those, then "we" should find another company to work for. If your company also possesses a power supply, then you could - and should - also measure the parameters as a function of DC bias. BTW, your schematic doesn't match your description, and it is conventional to have the signals flowing from left to right. |
| Faringdon:
Thanks, the El Cap that we need ESL and ESR for, at 450khz, is... EDH477M050S9SAA https://www.mouser.co.uk/datasheet/2/447/KEM_A4049_EDH-3316662.pdf Also, need ESL and ESR for a 10uF, 50V, 1210, X7R MLCC |
| tggzzz:
--- Quote from: Faringdon on May 03, 2024, 10:48:48 am ---Thanks, the El Cap that we need ESL and ESR for, at 450khz, is... EDH477M050S9SAA https://www.mouser.co.uk/datasheet/2/447/KEM_A4049_EDH-3316662.pdf Also, need ESL and ESR for a 10uF, 50V, 1210, X7R MLCC --- End quote --- Bully for you. RTFM. If the FM doesn't tell you, choose another capacitor. |
| RolandK:
These electrolytics are not specified for 450 kHz (as all electrolytics i am aware of), so don't use it there professionally, just measure for your personal enlightment. What is your application? |
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