<![CDATA[SoliForum - 3D Printing Community — RAMBo mosfets?]]> https://www.soliforum.com/topic/4567/rambo-mosfets/ Sun, 17 Nov 2013 15:33:40 +0000 PunBB <![CDATA[Re: RAMBo mosfets?]]> https://www.soliforum.com/post/41809/#p41809 The use PSMN7R0-60YS mosfets, which have an Rds of 4.96mohm. That's 1.11 watts @15A, not a big deal for a copper PCB to sink - especially with the boatload of vias they use around it.

]]> Sun, 17 Nov 2013 15:33:40 +0000 https://www.soliforum.com/post/41809/#p41809 <![CDATA[RAMBo mosfets?]]> https://www.soliforum.com/post/41805/#p41805 I was poking around on http://reprap.org/wiki/Rambo and looking at the pictures, I wondered "where are the mosfets with the big heatsinks you'd need to run the 15A bed heater the specs say is possible?"

Finally found them looking closer at the pictures and they are cute little surface mount parts with a lot of copper PCB and holes around them, but no external heat sink.

Have mosfets really gotten efficient enough to switch that much current with that little heatsink? Impressive if true.

]]> Sun, 17 Nov 2013 14:47:54 +0000 https://www.soliforum.com/post/41805/#p41805