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mosfets [2018/04/09 03:15]
24.236.65.175
mosfets [2018/05/11 00:24] (current)
131.215.31.3 Fixed typo: parralel->parallel
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 Never use the big MOSFETS for more than 12.5A ( and monitor connector and MOSFET temperatures at that current use, too much heating can be a sign of a bad wire connection ), and the small MOSFETS should never be used for more than 3A.  Never use the big MOSFETS for more than 12.5A ( and monitor connector and MOSFET temperatures at that current use, too much heating can be a sign of a bad wire connection ), and the small MOSFETS should never be used for more than 3A. 
  
-Trying to power a 40W ( or more ) hotend cartridge heater at 12V with the small FETs will destroy them, locking them to the "​ON"​ state. ​Less powerful+Trying to power a 40W ( or more ) hotend cartridge heater at 12V with the small FETs will destroy them, locking them to the "​ON"​ state.
  
 If you need to control more than 12Amps, you can not do it with one of the MOSFETS on board, however you can use a Solid State Relay. For information see the [[http://​smoothieware.org/​general-appendixes#​solidstaterelay|Solid State Relay Appendix on this page]]. If you need to control more than 12Amps, you can not do it with one of the MOSFETS on board, however you can use a Solid State Relay. For information see the [[http://​smoothieware.org/​general-appendixes#​solidstaterelay|Solid State Relay Appendix on this page]].
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 In the case of both the Big MOSFETS pair, and the Small MOSFETS pair, you take power from the PSU to them via their respective power input connectors. ​ In the case of both the Big MOSFETS pair, and the Small MOSFETS pair, you take power from the PSU to them via their respective power input connectors. ​
  
-There is an alternative however. For each pair, you can use jumpers ( one jumper for the small MOSFETS pair ( **JP28** ), two parralel ​jumpers for the two big MOSFETS pair ( **JP11** and **JP27** ) ). If you solder the pins for those OR connect a [[http://​www.computerhope.com/​jargon/​j/​jumper.htm|jumper]] to those pins, closing the circuit to VBB ( the stepper motors power input ), allowing you to take the power from those MOSFETS from the same place as the stepper motors do. +There is an alternative however. For each pair, you can use jumpers ( one jumper for the small MOSFETS pair ( **JP28** ), two parallel ​jumpers for the two big MOSFETS pair ( **JP11** and **JP27** ) ). If you solder the pins for those OR connect a [[http://​www.computerhope.com/​jargon/​j/​jumper.htm|jumper]] to those pins, closing the circuit to VBB ( the stepper motors power input ), allowing you to take the power from those MOSFETS from the same place as the stepper motors do. 
  
 In the case of the big MOSFETS, you have to solder and put in place two jumpers, in parallel, in order to handle more current. ​ In the case of the big MOSFETS, you have to solder and put in place two jumpers, in parallel, in order to handle more current. ​