Thanks, but supposing we are PWM dimming a 48V string of LEDs....then the current to the LEDs is going on and off, and the voltage across them has a ripple in it in phase with the PWM dimming, so in this case of PWM dimming, does the AC limit apply?, since there is an AC content to the LED current waveform.?
So what I am saying is, 60VDC is the limit of SELV circuits, but does this value of 60V come down when the LEDs are being PWM dimmed? And the SELV limit is lower than 60vdc for the case of PWM dimmed LEDs?
Also, why doesn't the LDH-45B-1050 LED driver, which has a maximum output voltage of 43V, boast of being "SELV" rated?
LDH-45B-1050 LED driver datasheet
http://www.meanwell.com/webapp/product/search.aspx?prod=ldh-45
..I mean surely, if something is SELV rated, then lots of people will buy it because it conforms with SELV regulations, so why are they not bragging of the SELV rating of the LDH-45B-1050 LED driver?
............................................................................................
And once again, the entire family of DLG series LED drivers below all have SELV outputs (<60VDC), so why does their datasheet not boast of this?..surely thay are going to miss out on sales due to not bragging of the SELV output rating? Customers want SELV outputs because it means they don't have to have such an expensive enclosure for their LED product, to protect against the voltage inside it.
DLG50-150 LED drivers
http://amtex.com.au/power_pdf/DLG50-150.pdf