T
treez
Guest
Hello
We are using the LNK304 on our PCB to supply 12V at 80mA.
Mains is 240VAC.
We wish to keep the input capacitance to the LNK304 at two parallel pieces of 100nF, 1812, 630V, X7R. (ie 200nF) This is due to cost reasons. And this is especially because we need flexi-term caps and above the 100nf value, they get very expensive.
The problem is that if the mains falls to 210vac, then the input voltage of the LNK304 falls down to 29V every 10ms, as the rectified mains rises and falls. This is below the datasheet minimum vin of 50V. However, the 12v output of the lnk304 does not drop out.
Should we be worried that out input voltage drops below the 50V minimum level? Ie will it mean damage caused to the LNK304?
The LNK304 certainly doesn’t overheat in this situation.
LNK304 datasheet
https://www.mouser.com/ds/2/328/lnk302_304-306-179954.pdf
We are using the LNK304 on our PCB to supply 12V at 80mA.
Mains is 240VAC.
We wish to keep the input capacitance to the LNK304 at two parallel pieces of 100nF, 1812, 630V, X7R. (ie 200nF) This is due to cost reasons. And this is especially because we need flexi-term caps and above the 100nf value, they get very expensive.
The problem is that if the mains falls to 210vac, then the input voltage of the LNK304 falls down to 29V every 10ms, as the rectified mains rises and falls. This is below the datasheet minimum vin of 50V. However, the 12v output of the lnk304 does not drop out.
Should we be worried that out input voltage drops below the 50V minimum level? Ie will it mean damage caused to the LNK304?
The LNK304 certainly doesn’t overheat in this situation.
LNK304 datasheet
https://www.mouser.com/ds/2/328/lnk302_304-306-179954.pdf