T
treez
Guest
Hello,
We are using the ECW-FD2J185 (1.8uf, 630v) film capacitor in our offline flyback smps, 240vac input.
It is for 24v, 10w output.
We sent it off for extreme temperature testing and it eventually failed with the TNY287 flyback controller showing a short from BP/M pin to Ground.
The testing was done at 190VAC and 10W load.
We are a little surprised that it failed. We wonder if actually the 1.8Uf film capacitor may have failed at high temp and become of less capacitance, meaning that the primary current of the flyback would go up.
Do you think this film capacitor could fail under high temperature such that its capacitance became much lower?
ECW-FD2J185 Film capacitor
https://industrial.panasonic.com/cdbs/www-data/pdf/RDI0000/ABD0000C255.pdf
We are using the ECW-FD2J185 (1.8uf, 630v) film capacitor in our offline flyback smps, 240vac input.
It is for 24v, 10w output.
We sent it off for extreme temperature testing and it eventually failed with the TNY287 flyback controller showing a short from BP/M pin to Ground.
The testing was done at 190VAC and 10W load.
We are a little surprised that it failed. We wonder if actually the 1.8Uf film capacitor may have failed at high temp and become of less capacitance, meaning that the primary current of the flyback would go up.
Do you think this film capacitor could fail under high temperature such that its capacitance became much lower?
ECW-FD2J185 Film capacitor
https://industrial.panasonic.com/cdbs/www-data/pdf/RDI0000/ABD0000C255.pdf