What would be the better MOV for L-N for a 90-140VAC input smps.The supply includes a 25mH CM choke and 0.1uf X2 cap,600v bridge and 250V bulk cap.
I was thinking these 150VAC 20MM from littlefuse.
Description V20E150
- Metal Oxide Varistor (MOV) * Voltage Rating AC, Vrms:150Vrms * Voltage Rating DC, Vdc:200VDC * Peak Surge Current @ 8/20uS:10000A * Clamping Voltage 8/20us Max :395V * Capacitance, Cd:1600pF * Package/Case:20mm Disc * Capacitance:1600pF RoHS Compliant: Yes
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But I think I remember reading your not sopposed to select the standoff voltage too close to the working voltage?
Would this be a better choice?
Description V20E175P
- Metal Oxide Varistor (MOV) * Voltage Rating AC, Vrms:175Vrms * Voltage Rating DC, Vdc:225VDC * Peak Surge Current @ 8/20uS:10000A * Clamping Voltage 8/20us Max :455V * Capacitance, Cd:1400pF * Package/Case:20mm Disc RoHS Compliant: Yes
Thanks.