| Electronics > Projects, Designs, and Technical Stuff |
| Really low value current sense resistor (50mV peak) will it have noise issues ? |
| << < (2/2) |
| Miyuki:
I have two phases Blanking is supported But datasheet is silent about noise transfered from CPU to comparators, or even detailed specs of comparators :-// Layout can be tricky to avoid inductive coupled on sense line or ground issue as it will be single ended measure |
| fourtytwo42:
I use PIC's in similar situations but preceded the internal comparitor with an external differential op-amp r-r io kelvin connected directly across the sense resistor. Even so I use LEB as the noise in an hard switched SMPS of any power (mine are 1-3Kw) is substantial never mind how much care you take IMOP. |
| Miyuki:
I also considering use of high side sense like HV7802 it is reasonably cheap and can be placed before chokes to give much cleaner signal and have configurable gain |
| Miyuki:
I agree with amplifier right next to sense can voltage go much lower |
| Vovk_Z:
--- Quote from: Miyuki on May 04, 2020, 01:51:09 pm --- will noise just mess this low signal and Ill need to get some amplifier ? --- End quote --- The problem will be wires to that shunt (their lengths) but not the shunt DC resistance because they can be longer than the shunt itself. |
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