Other Parts Discussed in Thread: TIDA-050030, TIDA-050029, TIDA-050040, PMP15004
We are currently evaluating various possible solutions for lighting a high-power LED with 1 A flow current in automotive environment.
The LED will be mounted on a separate PCB, which is 20 cm to 30 cm away from the driver board.
Probably the LED PCB has to be so small that there would be no space for an output capacitor on the LED PCB.
That and the fact of the long wires with high current (+ ripple current) is why we are concerned about EMC
Is the current through the LED one of the critical paths regarding EMC? We are concerned that the ripple current through the long wire will generate a lot of noise end emissions.
Another solution would be to use a DC DC buck converter which generates a constant voltage in the range of the forward voltage of the LED. The constant current would then be generated by linear drivers, thus avoiding an AC component on the long supply line to the LED.
Would you prefer the second solution to the first with regard to EMC?
Thanks a lot!