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Nov 16, 2009. 11:09 PMwestfw
says:
The Eagle Schematics in the download doesn't seem to match the final design...
It seems like a very strong mosfet driver for a relatively modest set of MOSFETs. It seems like there ought to be something cheaper around. I found FAN7842MX at Mouser ($0.75), but it seems to be aimed at using N-channel MOSFETs for both high and low-side...
It seems like a very strong mosfet driver for a relatively modest set of MOSFETs. It seems like there ought to be something cheaper around. I found FAN7842MX at Mouser ($0.75), but it seems to be aimed at using N-channel MOSFETs for both high and low-side...
Nov 17, 2009. 8:12 AMjohndavid400 (author)
says:
thanks, that was an old schematic, I uploaded the new one.
The mosfet driver is definitely overkill for those mosfets, but I used it because it has a higher voltage limit of around 35vdc. You can use the cheaper TC4427, but the voltage limit then becomes 18v, which is fine for most cases.
This was my 1st attempt at an Arduino shield, so the design could and probably will be improved, but this design works well for up to 6 amps. An all N-channel design would be more effiicient and could handle more current, but requires a bit more circuitry than this. I submitted this design because it is relatively easy to build and use, even for a beginner.
The mosfet driver is definitely overkill for those mosfets, but I used it because it has a higher voltage limit of around 35vdc. You can use the cheaper TC4427, but the voltage limit then becomes 18v, which is fine for most cases.
This was my 1st attempt at an Arduino shield, so the design could and probably will be improved, but this design works well for up to 6 amps. An all N-channel design would be more effiicient and could handle more current, but requires a bit more circuitry than this. I submitted this design because it is relatively easy to build and use, even for a beginner.
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