Hey all, this is my first post here.
I'm building an LED lighting circuit around the LM3409 controller using Cree XM-L LEDs. I am using the WEBENCH tool which is very helpful to help me select components. I hope to use the 3409 in multiple designs of varying LED strings and currents, including: 3S, 3S2P, and 3S3P at 3A/string (total 3, 6, and 9A respectively), as well as other configurations.
My question is - the datasheet specifies the maximum I_out for the 3409 is 5A. However, my understanding is that this controller (or any asynchronous buck with external FET) simply controls the gate for a power FET, which should be rated for the proper current. So, what does the 5A rating refer to?
Thanks in advance