Madmike8's Funbot build #2 March 30, 2015 07:51PM |
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Re: Madmike8's Funbot build #2 May 08, 2015 10:46AM |
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Quote
Cefiar
The FET on most RAMPS boards is a STP55NF06L, though I would personally replace it with something different like an FDP8870 or (and the one I like most at the moment) the IRLB8743.
The advantages of both of these FETs is that they have a MUCH lower Rds(on) than the original (this means they dissipate less heat when switched "on"), are pin compatible, and are about the same cost. The IRLB8743 has the lowest Rds(on) value, but both it and the FDP8870's work well for driving the heated bed.
Note: The IRLB8743 only supports up to 30V, however this should not be an issue if you're only running 12V or 24V. I've not seen anyone use >24V for the heated bed through the FET, so I generally consider this to be a non-issue, but I know some people are looking at 36V for their motors, so I thought it best to mention it in passing.
PS: If you're going to remove the FET, I recommend cutting the existing FET off (just under the plastic body) then desoldering the pins individually with a decent temp controllable iron that can put out a decent power and a pair of needle-nose pliers. Once you've removed that, you can use solder wick and a solder sucker to clean up the pads/holes. One of the pins on the FET (the source) is connected to ground. As the ground plane on the PCB is quite large, it requires a bit of heat and power to properly remove the FET pin and then clean the pad/hole. Trying to heat all 3 pads on the PCB at once (so you can remove the FET without cutting it's leads) is not easy, especially when one of them requires more power/heat to remove.