I have a problem with understanding why huge capacitor is frequently used in many examples and eval. boards when optocoupler LED is driving with TL103W. Here is an example:
Is it possible that is a sort of soft-start?
Thanks in advance.
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I have a problem with understanding why huge capacitor is frequently used in many examples and eval. boards when optocoupler LED is driving with TL103W. Here is an example:
Is it possible that is a sort of soft-start?
Thanks in advance.
Hi Denis,
I guess that it has to do with the power-on: Directly after the power-on C15 in uncharged and forces a current to flow through the LED of opto. A bit later R27 is fully charging up C15 and this current path for the opto's LED will dry up.
Kai