[Gta04-owner] GTA04 capacitor selection
glenn.mh.dk at gmail.com
Mon Jan 24 05:50:31 CET 2011
Another suggestion regarding capacitor selection.
As far as I know, aluminium capacitor have relatively short
lifetimes, are more error prone - they dry out over time, and in the
same proces get bigger ESR. I have encountered capacitors in linear
power supplies, that failed after 1,5 years use.
Therefore it is suggested that ceramic capacitors are selected
instead - bonus - they are bipolar and they are smaller!
There might be one problem with low-ESR - I assume - possible HF
ringing, but that can be minimized by distributing the big central
capacitors into many smaller at the ICs, and bypassing with a
1/10...1/100 capacitance of the big capacitor.
Cheapest - most are even low-ESR:
CAP CER 100UF 6.3V Y5V 1210
CAP CER 100UF 6.3V X5R 20% 1206
CAP CER 10UF 10V Y5V 0805
CAP CER 10UF 16V Y5V 1206
CAP 22UF 10V CERAMIC F 1206
More expensive - but good in high power SMPS:
Aug 1, 2007, Stacked-Ceramic Caps Brave High Temperatures:
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