jamesdeen
Newbie level 4
Hi everyone, long time lurker here and first time poster.
I'm working on an audio project where I need a split power supply (+/- 15V) and I need to use a SMPS in this case.
I'm not comfortable designing my own split SMPS, and I've noticed that there are several encapsulated board mount DC-DC converters with split output... which is perfect!
Most that I'm looking at spec ripple at 50mVp-p and noise at 150mVp-p like this example: https://www.cui.com/Product/Power/Dc-Dc_Converters/Isolated_Board_Mount/10_W/VYB10W_Series
I'd really like to get the ripple and noise lower since this is an audio project. Someone suggested adding an RC then an LC then an RC filter to make a 3-stage filter, I believe he saw something similar (or even more stages) in an SMPS powered audio mixer. Is this an ideal solution, if so, can someone please walk me through the calculations for the components of that filter. Or are there other options?
In case some extra info helps: Current draw will be around 250mA per rail. Space isn't an issue in the design. Unfortunately, yes, it has to be a SMPS, with an input voltage appropriate for a wallwart (smps or linear I suppose), or 110/220VAC mains.
I hope I have all the info there, cheers and greetings,
Mike
I'm working on an audio project where I need a split power supply (+/- 15V) and I need to use a SMPS in this case.
I'm not comfortable designing my own split SMPS, and I've noticed that there are several encapsulated board mount DC-DC converters with split output... which is perfect!
Most that I'm looking at spec ripple at 50mVp-p and noise at 150mVp-p like this example: https://www.cui.com/Product/Power/Dc-Dc_Converters/Isolated_Board_Mount/10_W/VYB10W_Series
I'd really like to get the ripple and noise lower since this is an audio project. Someone suggested adding an RC then an LC then an RC filter to make a 3-stage filter, I believe he saw something similar (or even more stages) in an SMPS powered audio mixer. Is this an ideal solution, if so, can someone please walk me through the calculations for the components of that filter. Or are there other options?
In case some extra info helps: Current draw will be around 250mA per rail. Space isn't an issue in the design. Unfortunately, yes, it has to be a SMPS, with an input voltage appropriate for a wallwart (smps or linear I suppose), or 110/220VAC mains.
I hope I have all the info there, cheers and greetings,
Mike