Hello I found this article :
https://ieeexplore.ieee.org/document/1476205
About schottky low frequency noise. I have never seen it discussed on this forum. It is said to that schottky diodes produce more low frequency noise than PN junction.
Does it matter in ou PSUs ?
Any noise measurements ?
Thank you.
https://ieeexplore.ieee.org/document/1476205
About schottky low frequency noise. I have never seen it discussed on this forum. It is said to that schottky diodes produce more low frequency noise than PN junction.
Does it matter in ou PSUs ?
Any noise measurements ?
Thank you.
No, it doesn't. It could matter when you use a Schottky diode forward voltage as a voltage reference, which I've never seen anyone doing, but not when you use it as a rectifier.
Thank you very much.
@Mark Johnson
Thank you. I think we have a pretty good psrr below 300Hz. But anyway the low vf of schottky and no recovery is still worth it vs PN diodes.
@MarcelvdG
Thank you, I understand.
By the way is there anything better than the dreaded 1n5819 for a bridge rectifier ? Besides active bridges.
@Mark Johnson
Thank you. I think we have a pretty good psrr below 300Hz. But anyway the low vf of schottky and no recovery is still worth it vs PN diodes.
@MarcelvdG
Thank you, I understand.
By the way is there anything better than the dreaded 1n5819 for a bridge rectifier ? Besides active bridges.
Another thing about Schottky diodes is the reverse leakage current. I was using some of the diodes to protect a couple inputs on an Arduino from overvoltage when the Arduino was powered off (inputs clamped not to go above Vdd). With one type of Schottky when the Arduino was powered on, the clamped inputs were immediately destroyed. Apparently the reverse leakage current caused overvoltage at the inputs before the rest of chip fully powered up. A different type of Schottky worked fine. Also, found that a DVM in diode check mode showed evidence of reverse leakage current in the problematic Schottkys.