Webinar showing engineers how the capacitance of different capacitors change. Your applications voltage, temperature, and frequency can cause shifts in the critical specification. Here's how to calculate your applications effect on polymer type capacitors.
5. EIA-198-D
• Testsetup and conditions for :
• Ceramic dielectric capacitors classes I, II, III
• Polymer and Alu measured the same way
C_min C_max Test
Frequency
V_rms V_DC
0,1pF 1nF 1kHz 1V 0V
1nF 10µF 1kHz 1V 0V
10µF 1800µF 120Hz 0,5V 0V
7. VCC
• VCC = voltage change capacitance
• Proportional with electric field in the dielectric
• thinner dielectric same voltage increase E-field
8. Net capacitance 47µF/6.3V
compare case sizes 0805/ 1206/ 1210
0V 5V dC %
0805 42,3µF 11,3µF 26 %
1206 42,8µF 22,9µF 52 %
1210 48,3µF 29,4µF 69 %
9. dielectric physics
• VCC = voltage change capacitance
• Force applied on charged particles caused by an
electrical field
• thinner dielectric same voltage increase E-field
( Downsizing!)
20. Thank You!
Axel Schmidt
Field application Engineer
Cell +49 172 89 25 284
email: AxelSchmidt@kemet.com
Hermann-Köhl-Str. 2
86899 Landsberg am Lech
Germany
www.kemet.com
21. VCC explanation
• Nominal capacitance is measured 1kHz/0VDC/1VAC
• Capacitance drop thru locked dipoles
• Ripple current decrease
• E-Field is voltage between electrode plates (distance)
• Downsizing requires thinner dielectric
• Thinner dielectric increase electrical field
• capacitane loss is higher