For above 1A I get concerned with using SO-8 packages as the heat will be hard to get out of the chip and it will be hard to uphold the rated amp of that chip. Much like the hi/low is only able to do 1/8 amps when it's technically rated for 2A. The thermal properties become important when you go higher in current.
My favorite is VND5E025AK-E, as it has 3 potential drop in replacements so it should be good for long term and it has an off the shelf eval board so faster development cycle. Then my next runner up is VND7020AJ-E because it's cheapest per channel.
PowerSSO-24 board has arrived. Need pin#1 marker and the larger heatsink vias would be easier to work with, but the main thing is that everything aligns right.
I do not have the diodes yet, how essensial are they to try the board?
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Looks like the hardware side of Dodge Neon high-side field control wire is taken care of now, next step the software.
Check the video - notice how voltage changes bit by bit while I am increasing PWM duty cycle, and then it suddenly runs away. Looks like PID would be needed?
Very nice, very nice. In terms of software you probably want to filter the analog signals some, to smooth out that needle. The PID will not like the noise either.
Great and thanks for that offset thing. One request, can you put a note on it some where that notes output % duty = Pterm + Iterm + Dterm + offset%
Hmmmm, it might also be good to also post the general algo some where on that screen. Such that those of us who want to know the details of what kind of PID we are dealing with (mostly how the I term is handled) it would help show that with out requiring jumping into the code.
As a note to others who might come across this thread. The offset is for a kind of manual tuning. For example, if the P, I and D set to 0, the output will equal the offset% which means manual control. You can then manually adjust the output duty until you reach 14V. At this point you know what the PID loop should be adjusting too, which can be handy when tuning. AKA if you know where you should be you'll have some insight to see if you are getting there correctly.
just placed an order