We are looking at using this device in a new design and are trying to size the capacitor. The input voltage is 12V in our case and need an output voltage of 5V. The Supercapacitor needs to supply enough energy to provide the 5V output for about 2-3 seconds at 70mA when input power is lost.
Hello 2moto, apologies for the delayed response. To answer your questions in the order asked:
Do you have a target capacitance for the supercapacitor? For reference, the datasheet outlines the following example with a 10 Farad supercapacitor:
The Supercapacitor Output should be able to give you a 5V charged output. Given a 12V input, this should work out well.
I wouldn’t say there is relative minimum for the inductor to be used. However, most typical applications would warrant something in the uH range. Of course (other than inductor size), the ripple would primarily be the biggest variable here. See the following equations and use them in consideration with your design such that you can minimize your inductance while also having an acceptable ripple:
Hopefully this has been insightful.
Best,
Krishan
