Other Parts Discussed in Thread: SN74LV125A
About safety certification process in China:
Hello TI Experts, I did safety certification process in Germany and last year I experienced the similar safety certification in China, which dived me totally crazy.
First, the person from certificate agent Rheinland in China, saw a danger or possibility that UC2844's Duty Cycle might be over 50%.
Then about the buff SN74LV125A he saw another possible danger, that in case of the supply voltage failure, the input signal could also be forwarded to the output. Again here we have to put a large R in serie of output, so that even if the input were forwarded to the output, then the driving strength was so low, that it can not drive the opto coupler further. -- I personally find it very bad, because the large R makes the driving strength in normal also lower than before.
During the whole story with the China Rheinland, I found there is a very big gap the theory and reality here. The circuit, which was good and worked fine for over 5 years, needs to be reworked only for a dangerous in one person's eye?
I am here asking for help from anyone, I would appreciate for your support：
1, I know, TI has a category of safety components, where the whole documents around safety are available. What about other components, like buff, out of the safety category? As in above, the person did not trust what in data sheet said, so he insisted on the "possibility" that duty cycle could more than 50%, because TI has no other docu to confirm "never over 50%".
2, anyone has good experience with other agent, like TueV or DEKRA in China?
3, any valuable workshop in China about safety function in industrial application?
Thanks in advance!
Best regards,
Long
