My PSU (LNK306) has quite low ripples in its two output regulators (5V & 3.3V) - 20mV ripples.
The problem is that when the relay pulls 200mA (short pulse of 30msec), the PSU outputs large ripples and spikes that reach 1V, and it causes problem in the other ICs, like MCU.
Is the problem pulling suddently a 200mA short pulse?
Or is it because the relay suddenly changes its COM state from conducting 0A to conducting 16A.
Will placing an inductor and "protecting againts voltage drop" capacitor between the Relay Driver and the PSU will help reducing the ripples? (since the inductor will slow the current change in the PSU, while the capacitor will charge the relay driver).
Addition:
It also happen when I dont use a relay but manually connect and disconnect loads to my PCB, meaning i do the job of the relay
Thank you.
The problem is that when the relay pulls 200mA (short pulse of 30msec), the PSU outputs large ripples and spikes that reach 1V, and it causes problem in the other ICs, like MCU.
Is the problem pulling suddently a 200mA short pulse?
Or is it because the relay suddenly changes its COM state from conducting 0A to conducting 16A.
Will placing an inductor and "protecting againts voltage drop" capacitor between the Relay Driver and the PSU will help reducing the ripples? (since the inductor will slow the current change in the PSU, while the capacitor will charge the relay driver).
Addition:
It also happen when I dont use a relay but manually connect and disconnect loads to my PCB, meaning i do the job of the relay
Thank you.
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