Capacitors.md
Ceramic

MLCC have can have poor DC bias performance, resulting capacity drop of around 80% at 80V (100V rated voltage).

<![CDATA[]]>https://docs.google.com/spreadsheets/d/1vxxJvD4m8UsKfiyYFJieKQtYqnGDK7ag...<![CDATA[]]>


X7S (and C0G ?) has lower DC-bias capacitance drop


good for snubbers, input caps






  

  

  

  

  

  
80V dc-bias
  





  
murata GRM32EC72A106KE05
  
10uF
  
100V
  
X7S
  
1210
  
1.4uF
  
<![CDATA[]]>link<![CDATA[]]>


  
tdk C5750X7S2A106K230KB
  
10uF
  
100V
  
X7S
  

  
2.22uF
  
<![CDATA[]]>link<![CDATA[]]>


  
tdk CKG57NX7R2A106M500JH
  
10uF
  
100V
  
X7R
  

  
3.6uF
  
5mm MEGACAP!  expensive




Electrolytic

$$ C_{in} >= \frac{D \cdot (1-D) \cdot I_O}{ \Delta V_{in} \cdot f_{sw} }$$

<![CDATA[]]>ref: TIDA-010042 400-W GaN-Based MPPT Charge Controller<![CDATA[]]>

How to select input capacitors for a buck converter <![CDATA[]]>https://www.ti.com/lit/pdf/slyt670<![CDATA[]]>

TDK has a
good <![CDATA[]]>parametric search<![CDATA[]]>

<![CDATA[]]>Digikey aluminium elec. caps D=16mm<![CDATA[]]>

See parts datasheet for rated ripple current. Manufacturers usually specify it at 100khz, 105°C.
You'll usually find impedance as well, which gives you an idea how much power lost in the capacitor.

Loss is proportional to HF impedance, usually specified in the data sheet at 100 kHz.

Rubycon


<![CDATA[]]>Rubycon Catalog<![CDATA[]]>
<![CDATA[]]>Rubycon PX Series<![CDATA[]]>
ZL low imp.


ZLH long life


ZLJ high ripple
ZLQ mini (up to 35V)




Selection




  
mfr, series
  
cap
  
v
  
D
  
L
  
ripple @100khz
  
imp@20°C/100khz
  
px100
  
MPN




  
rubycon PX
  
470µ
  
100
  
16
  
26
  
1.06
  
<60mΩ  ?
  

  



  
nichicon HE(M
  
470µ
  
100
  
16
  
36
  
1.9
  
45mΩ
  

  



  
rubycon ZLH
  
470µ
  
100
  
16
  
31.5
  
2.4@100khz
  
33mΩ
  

  



  
rubycon ZLJ
  
470µ
  
100
  
16
  
31.5
  
2.65
  
32mΩ
  
$1.5
  



  
rubycon ZLJ
  
470µ
  
100
  
18
  
25
  
2.5
  
36mΩ
  
$1.3
  



  
BERYL RC
  
470µ
  
100
  
16
  
26
  
1.98
  
60mΩ
  

  
LCSC C365811


  
samyoung NXA
  
470µ
  
100
  
16
  
31.5
  
1.85
  
32mΩ
  

  
<![CDATA[]]>pdf<![CDATA[]]>


  
Chengx KM
  

  
100
  
16
  
25
  
0.918
  

  

  



  
Chemi-Con KZN
  
560µ
  
100
  
18
  
26.5
  
2.75
  
27mΩ
  

  



  
Chemi-Con KZN
  
680µ
  
100
  
16
  
35.5
  
3.15
  
20mΩ
  
1.05 €
  
EKZN101ELL681MLP1S