komax
Junior Member level 3
I am designing an LDO that will be used to power a small digital circuit. I have access to said digital circuit and have been simulating my LDO with it.
My question: when designing my pass device to support maximum load current, which numbers should I use, average or RMS current? And why?
Follow up question: when measuring the load current I realise that the current goes both ways (+ and -), so if I were to measure RMS the negative current will be squared and counted as well while in reality this negative current simply represents kick back current towards the LDO due to switching (I think), wouldn't counting these current be over-design? Should I make some adjustment to the waveform to get rid of negative parts before taking RMS then?
Thank you in advance for your kind help.
My question: when designing my pass device to support maximum load current, which numbers should I use, average or RMS current? And why?
Follow up question: when measuring the load current I realise that the current goes both ways (+ and -), so if I were to measure RMS the negative current will be squared and counted as well while in reality this negative current simply represents kick back current towards the LDO due to switching (I think), wouldn't counting these current be over-design? Should I make some adjustment to the waveform to get rid of negative parts before taking RMS then?
Thank you in advance for your kind help.