P
panfilero
- Jan 1, 1970
- 0
I'm needing an over-voltage protection circuit to put at the output of a switching regulator that takes in 100V input and drops it to 24V... I'd like to protect the output from going over 28V.
Here's the 3 options I was considering: For all the options the point is to blow my 5A fast acting fuse that's at the input, so I'm trying to decide on a way to short my output
1. A Zener - I'm thinking these get rather bulky for higher current handling, and they're not very accurate
2. A TVS - Probably better than the Zener option as far as current handling and bulkiness... I think TVS kills Zener for this application
3. An SCR - I could trigger an SCR off of a LM431 to get an accurate trip voltage and I think I could probably find a decently sized SCR that could handle the current required to make the fuse pop
Anybody have any thoughts or recommendations for OVP circuits like this... I'm likeing the SCR option right now
much thanks!
Here's the 3 options I was considering: For all the options the point is to blow my 5A fast acting fuse that's at the input, so I'm trying to decide on a way to short my output
1. A Zener - I'm thinking these get rather bulky for higher current handling, and they're not very accurate
2. A TVS - Probably better than the Zener option as far as current handling and bulkiness... I think TVS kills Zener for this application
3. An SCR - I could trigger an SCR off of a LM431 to get an accurate trip voltage and I think I could probably find a decently sized SCR that could handle the current required to make the fuse pop
Anybody have any thoughts or recommendations for OVP circuits like this... I'm likeing the SCR option right now
much thanks!