Electronics > Power & Renewable Energy

Y caps better directly across transformer in offline flyback SMPS?

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Faringdon:
Page 4 of the Mornsun LS15-13B12 power module (Offline flyback, 12vout, 15w out) shows a Y cap from primary ground to secondary ground. This is obviously for common mode filtration. But wouldnt it be better if it was actually fitted on the Mornsun PCB and placed right across the actual isolation barrier, immediately next to it?

Mornsun offline power module
https://www.mornsun-power.com/html/pdf/LS15-13B12SS-F.html

voltsandjolts:
Please stop. Please.

jonpaul:
No reason, the module supplier is showing various safety and EMI components external to the module.

Diffreent applications will demand different X, Y caps, fuses etc eg Japan/EU/USA or application areas, eg medical/broadcast/consumer/industrial.

Jon

Faringdon:
Thanks, though you would agree, that Y caps across the isolation barrier need to be as near the transformer as possible?

Gyro:
Y caps are far more accessible in through-hole. You should have noticed that the Mornsun module is completely smt.

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