I have SMPS from conex electronics (48V) for about 2 years that I use to power an amp (TPA3255). The combo was rock solid for all this time. I believe its a regulated PSU.
Recently got a new amp board that I'm testing, while hooking up and testing everything, the main power output is reading 69.4v without load! and now I think the amp is dead is this right or do I have a bad PSU? Aux power supply which 12v is reading 11.8v so close, but the main which is suppose to be 48v is puzzling!
Can anyone please explain this to me?
Recently got a new amp board that I'm testing, while hooking up and testing everything, the main power output is reading 69.4v without load! and now I think the amp is dead is this right or do I have a bad PSU? Aux power supply which 12v is reading 11.8v so close, but the main which is suppose to be 48v is puzzling!
Can anyone please explain this to me?
Nothing specific without knowing all the details but it may well be that the 12 volt supply is the one that is monitored and held to the correct value and the other supply may well rise if lightly loaded.
If your new amp draws little current or even no appreciable current in any kind of standby condition then that may be a factor.
You would have to try loading the rail in question and see just what kind of current is needed to bring it down... assuming there is not a fault of course.
If your new amp draws little current or even no appreciable current in any kind of standby condition then that may be a factor.
You would have to try loading the rail in question and see just what kind of current is needed to bring it down... assuming there is not a fault of course.
Maybe this is of any help?
https://www.diyaudio.com/forums/class-d/87913-class-amp-photo-gallery-162.html#post6305030
https://www.diyaudio.com/forums/class-d/87913-class-amp-photo-gallery-162.html#post6305030
Nothing specific in that post, I need someone to measure the same SMPS without load as I don't want to burn another amp. 69v is way above the rating stamped on it.
Sent conex an email hopefully they will respond.
Sent conex an email hopefully they will respond.
I had a look on the Connex site and the info there seems to confirm my own view (post #2 above)
http://connexelectronic.com/wp-content/uploads/2017/09/SMPS600RS.pdf
http://connexelectronic.com/wp-content/uploads/2017/09/SMPS600RS.pdf
