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| View Poll Results: What is your favorite feature of the SD540? | |||
| Light Weight |
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25 | 20.33% |
| Low Cost |
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47 | 38.21% |
| Multi-Bank Option |
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31 | 25.20% |
| I do not like this product. |
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47 | 38.21% |
| Multiple Choice Poll. Voters: 123. You may not vote on this poll | |||
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#13
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Re: SD540 Motor Controller
17 mOhm Rds on is really high for this type of motor controller. At 30 amps, which FRC robots will draw for a few seconds, you're dissipating 15.3 watts in your FETs!
It seems weird to have this so high - you'd almost have to go out of your way to find FETs with 8 mOhm Rds. There are tons of FETs designed for motherboard switching power supplies that do much, much better. It seems more likely there's some other issue, like V_gs dropping on the high side FET, or insufficient gate current, or possibly even thermal issue. |
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