Mosaic
Well-Known Member
I am designing a cct which has large power transients @ around 38VDC. A capacitive discharge system similar to ignition pulses @ 120Hz.
I want to protect the MCU from ground bounce or ignition noise on it supply rails.
Is it advisable to place ferrite beads in the MCu Vcc and Gnd before or after the 5V regulator?
Star topology for the grounds & decoupling caps are included.
Also I am looking at using an optocoupler between the MCu pin and the MOSFET driver (mcp1407) input.
https://www.newark.com/avago-technologies/4n35-000e/optocoupler-phototransistor-3550vrms/dp/36J9837
But with a 3uS latency, would this cause any pulses under 3 uS to be lost? What would happen for say a 5uSec pulse? Would it just be time shifted by 3uSec an remain 5uSec long?
I want to protect the MCU from ground bounce or ignition noise on it supply rails.
Is it advisable to place ferrite beads in the MCu Vcc and Gnd before or after the 5V regulator?
Star topology for the grounds & decoupling caps are included.
Also I am looking at using an optocoupler between the MCu pin and the MOSFET driver (mcp1407) input.
https://www.newark.com/avago-technologies/4n35-000e/optocoupler-phototransistor-3550vrms/dp/36J9837
But with a 3uS latency, would this cause any pulses under 3 uS to be lost? What would happen for say a 5uSec pulse? Would it just be time shifted by 3uSec an remain 5uSec long?