DC-DC Ground connections
DC-DC Ground connections
(OP)
Hi all,
I'm using a DC-DC to drive a logic circuit from 12V, trouble is I need to make the ground of both the logic and power circuit common as they interface and power the same unit, this unit runs off of the 12V that I use to feed the DC-DC but the logic circuit also drives parts of this unit hence the ground connections needing to be common between logic and power.
Any help or ideas appreciated.
DC-DC is traco power 9-36VDC I/P; +/- 5VDC O/P.
Regards
Andrew
I'm using a DC-DC to drive a logic circuit from 12V, trouble is I need to make the ground of both the logic and power circuit common as they interface and power the same unit, this unit runs off of the 12V that I use to feed the DC-DC but the logic circuit also drives parts of this unit hence the ground connections needing to be common between logic and power.
Any help or ideas appreciated.
DC-DC is traco power 9-36VDC I/P; +/- 5VDC O/P.
Regards
Andrew





RE: DC-DC Ground connections
So...
Your question is not clear... Please try again.
RE: DC-DC Ground connections
input and output lows common (noise reduction).
As long as the common (ground) is negative on both,
there should be no problems. I do it routinely
when driving steppers. There are methods to add/
subtract the input voltage to the output, but I
doubt that that would be desirable in your case.
Onr thing you do need to do: make the common
ground connections at one point only, preferably
as close to the logic ground as possible.
Otherwise, noise in the driver section could
affect the function of the logic board.
Bypass everything liberally.
<als>
RE: DC-DC Ground connections
Regards
Andrew
RE: DC-DC Ground connections
RE: DC-DC Ground connections
input and output lows common (noise reduction).
As long as the common (ground) is negative on both,
there should be no problems. I do it routinely
when driving steppers. There are methods to add/
subtract the input voltage to the output, but I
doubt that that would be desirable in your case.
Onr thing you do need to do: make the common
ground connections at one point only, preferably
as close to the logic ground as possible.
Otherwise, noise in the driver section could
affect the function of the logic board.
Bypass everything liberally.
<als>
The I/P is 12VDC (2 pin) and O/P is +/- 5VDC with a common connection (3 pin).
RE: DC-DC Ground connections
RE: DC-DC Ground connections
Usually it is done, as intended here, with a common ground potential.
However, at times controlling through opto-couplers can make things easier.
It could depend on things like number of controls, wanted max. delays of the controls, noise sensitivity in the analog circuitry, cost budget for the project, final production costs etc.