Quote:
Originally Posted by himalaya
The 150A uses 36 MOSFETs, ON semi's NTMFS4833N(the MMM uses NTMFS4108N).
Here's my picture.
On the top side of PCB: 4x6 = 24 FETs，there are two more rows underneath the power PCB, 2x6 = 12 FETs. Note the way the heatsink touches. Looks like HobbyWing was trying to cool the PCB, not directly the FETs (to take care of the ones on back side maybe? ).
 |
Now that makes more sense. 36 of those FETs more than meets the 150A spec. Those metal bars attached to the PCB is a good idea IMO because the PCB carries the majority of the heat (heat doesn't travel as well through the plastic FET casing as it does through the leads).