Monday, 21 August 2017

power - Should I add Capacitance on Switched High Side


Following from this question, which remains open... if I've got a microcontroller switching the high-side power to a sub-system, using a circuit like this:


enter image description here



... should I add bulk and/or decoupling capacitance on the SENSOR_5V net? I do have bulk and decoupling capacitance on the +5V net. In the broader context of this circuit, SENSOR_5V basically just goes to a connector pin, which supplies power to a separate board through a short cable.


So, now I'm wondering (in light of the referenced prior question) whether it would be a help or a hindrance to add say a 10uF ceramic and a 100nF ceramic to the SENSOR_5V net? Or maybe even a 100uF tantalum perhaps? What do you think?




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