Vega Customer Applications Manual
Section 1 - Connection
Rev. A3: October 2003
Page 6 of 48
When connecting Vega by means of a cable harness, run the remote sense and power output cables as separate pairs
twisted tightly together with at least 1 twist per centimetre. Keep cable runs as short as possible.
When connecting Vega to the load by means of a PCB backplane, run the power tracks "back to back" on the PCB to
minimise the projected area of the loop connecting the positive and negative outputs. Run the remote sense and
power connections as separate pairs, avoiding close parallel runs and only coming together at the load.
The load should be de-coupled with 10uF of capacitance per Amp of load current. The greater the amount of de-
coupling, the better the transient response of the system will be. (NB Max recommended de-coupling is 1000uF/Amp).
Remote Sense.
All single output Vega modules are provided with remote sense connector as standard. Twin output Vega modules are
available with remote sense but need to be ordered with a secondary option “R” specified. In both cases the Molex
connector viewed from the back of the power supply is :-
Remote sense can be used to compensate for the drop in voltage along the load cables or for the drop in
voltage across blocking diodes. The voltage at the output terminals will be higher than that at the load by an amount
equal to the voltage drop due to load lead resistance and/or blocking diodes if used. The maximum voltage at the
terminals cannot exceed the maximum voltage specified for that module.
Always observe the following general rules for remote sense operation :-
Ensure that the remote sense cables are twisted pairs.
PCB tracks for remote sense should be run back to back.
Ensure that the remote sense cables / tracks are as short as
possible.
Ensure that the sense cables are not twisted together with the
power cables.
PCB power tracks and remote sense tracks should be kept
away from each other as far as is possible.
Do not fit components (resistor, inductor or diode) into remote
sense lines. This could make the system unstable.
See the data sheets for each module to see the maximum
voltage drop that remote sense can compensate for, do not
exceed this value.
Load
Load
+V
+V
-V
-V
-S
-S
+S
+S
+Ve Sense
-Ve Sense
