I have found that such high dielectric constant capacitors have other
problems in some circuits. While the capacitance value is dropping,
as much as 50% when you apply voltage, their physical volume is
changing. They behave as piezoelectric transducers.
I have used them inappropriately, and found them singing loudly. If
that were to happen in a switching regulator, I would think the ultrasonic
vibrations could do damage to the capacitor, the PCB, or the solder joints.
-Chuck Harris
Poul-Henning Kamp wrote:
In message<4d336a19.40...@freenet.de>, "Dr. Frank Stellmach" writes:
High cap value Ceramics are available since years, [...]
Can you clarify one thing for me: When I studied datasheets for these
it looked like they drop 50% of their capacitance at a DC voltage
of 10-20V.
Doesn't that make them a so-so bargain for power supply bulk capacitance ?
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