I just received my evaluation board. In my application I need 23A at 22V. Looking at the data sheet it looks like this device would do it. Unfortunately when you calculate the external current limiting resistor values it says the the minimum is 4m Ohms. That works out to be just over 12A. It looks like for my application I would need 2m Ohms. Am I missing something here? Would there be any Issue paralleling two of these to get the current that I need?
Thanks,
I am not sure if that would work for your use case. Our datasheet only shows efficiency measurements for up to 5A for 12V outputs. Maybe we can find a better alternative, what is your input voltage?
No way it will work. Set the external current limit to zero ohms ( for arguments sake) and you are still stuck with the internal current limit of 19A. In the most optimistic case the power you can get out of it is 19A * Vin and that doesn’t allow for efficiency lose or inductor ripple current. What is your Vin?
My battery is 20V at full charge and 15V when it shuts off. That is why I asked the second part of the question. Would there would be any foreseeable issues with setting up two of these in parallel.
My application at 22V uses 400W normal and 500W peek. So that would be ~23A.
So 500W off a 15V battery is 33A. Too much for one part. I suspect that two together might be a problem. there is no way to synchronize their clocks so they could possibly disturb each other with switching noise. You could tie their FB and Comp pins together which would force a decent current sharing between the tow. Get two demo boards and give it a try, 50/50
Second demo board is on the way!
Here is an update. paralleling two eval boards work for a short time. Do not tie FB and Comp pins together. After collapsing the regulators many times I find that they collapse at a much lower current now.
So these are definitely not going to work for my issue.