Electronics > Repair
bad caps on samsung lcd display
lpc32:
Will a much lower ESR than the original caps destabilize the power supply output?
David Hess:
--- Quote from: lpc32 on July 06, 2014, 09:15:53 pm ---Will a much lower ESR than the original caps destabilize the power supply output?
--- End quote ---
It is possible but also unlikely you will be able to lower the ESR enough to do this unless you change the capacitor type.
lpc32:
You mean solid polymer instead of wet?
David Hess:
--- Quote from: lpc32 on July 10, 2014, 02:22:00 pm ---You mean solid polymer instead of wet?
--- End quote ---
That could be enough to do it but it will depend on design of the switching regulator and how much phase margin remains with the very low ESR capacitor. Usually this problem shows up when an aluminum electrolytic or solid tantalum capacitor at the output of a low dropout regulator is replaced with a large value ceramic capacitor.
It is easy enough to test with an oscilloscope by watching the output during a sharp load change. In extreme cases the output will oscillate.
lpc32:
What are the expected side effects of higher ESR, and of lower ripple current rating?
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