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Offline Flyback: HV Electrolytic capacitor lifetime

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cupoftea

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Hi,
We are doing an offline 180-265VAC Flyback (15W) with Mornsun LS15-13B12 AC/DC power module. We must add a primary side HV DC bus capacitor….
Which of the following capacitance choices would dry out quicker?...


1…One 33uF , 450V EKXF451ELL330MM20S Electrolytic capacitor
OR
2..Two 68uF , 250V UCY2E680MHD3TN Electrolytic capacitors in series.


Please also answer with relation to…
A)…Flyback on 1W standby load all the time
B)…Flyback on Full power all the time…approx. (200mA of AC rms ripple current at 100Hz)


EKXF451ELL330MM20S Electrolytic capacitor datasheet (33uF, 450V)
https://www.chemi-con.co.jp/products/relatedfiles/capacitor/catalog/KXFLL-e.PDF

UCY2E680MHD3TN Electrolytic capacitor datasheet (68uF, 250V)
https://www.nichicon.co.jp/english/products/pdfs/e-ucy.pdf
 

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