Hello all!
We are students of Architecture in Columbia University and we have a project in which we are using arduino. We need to use to our breadboard an H-bridge with 16 legs but we found only with 8. Can we use 2 H-bridges of 8 then? we saw that the sceme of the 8 and of the 4 are different. We also have one H bridge with 14 legs but we dont know how to figure this out.
Can you please help us??
Thank you very much.
i have no idea what you mean...
H-bridges with MOSFETs probably can be paralleled. H-bridges with typcal NPN/PNP internals may not work well in parallel.
I imagine 14 and 16 "legs" are the #of pins on the chips they have.
Too bad the chips aren't marked with something like SN754410, because if
that were the case, then someone could simply do a google search and find
the datasheet.
zoomkat:
H-bridges with MOSFETs probably can be paralleled. H-bridges with typcal NPN/PNP internals may not work well in parallel.
I'm wondering it this is actually true - secondary breakdown and current balancing is obviously a concern in linear amplifiers using BJTs, but in a switching application secondary breakdown shouldn't be an issue should it? At saturation and high-currents its the distributed resistance that contributes most to Vsat... Remember the classic secondary breakdown failure between devices is because Vbe is common to all devices.
We need to use to our breadboard an H-bridge with 16 legs
Why?
Go back to the people who set you this problem and demand some education on at least the fundamentals of what you are trying to do. Then maybe if you actually use words that other people can understand, and then you can get help.
I'm wondering it this is actually true
Yes it is the negative temperature coefficient that screws you, the hotter one gets the lower the resistance is so the more current it passes and the hotter it gets. So they don't share current equally.
However this is nothing to do with the original posters request for a bridge with more legs.