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Multiple LM3402 Switch Mode LED drivers will cause EMC problem?

treez
Intellectual 970 points
Other Parts Discussed in Thread: LM3402

Hello,

We wish to use multiple LM3402 LED drivers to light 30 red LEDs from the 12V car battery rail.

So we wish to use 10 LM3402 based buck led drivers, each LM3402 driving 3 red LEDs.

They will all be next to each other on the PCB....will this create an EMC problem? The LED current is 120mA, so the power of each LM3402 based Buck will be 1W...so all together , its 10W.

If there is an EMC problem, then why is  ten 1W converters worse than having one 10W converter?