We purchased balenafin kits and want to integrated them on our large stratospheric balloons. We have batteries that can deliver up to 33.6V. You specify that the balenafin should not be powered at more than 30V. However, a review of your schematics showed us that your DCDC converter can accommodate up to 42V, and the TVS diode at input 40V. So, we assume that the 30V max mentioned is for derating. Our question: Do you see a problem if we power the balenafin at 33.6V? This value on our side is protected, it won’t go higher. Also, 33.6V is just the initial max power, the nominal power is 28V, so the Balenafin will not be at 33.6V for a long time.
Indeed the lower voltage is for derating purposes. The balenaFin should work @33.6V depending on the ambient temperature and target load. We haven’t tested the fin for anything higher than 30V though, so I can’t say for sure.
If you can shed a bit more light into these two parameters I might be able to give you more accurate data.
Hi Nico, sorry about my late reply, lots of stuff going on and there were changes in our design. We are now powering the balenaFin at a more reasonable 12V. I got close to 1A at bootup (About 11W), much less after that (about 4W). About the environment, the ambient temperature outside the box is about -60C, within the box it should remain above 0C, maybe -5C, but when the Sun is shining on us we could go to 50C. Quite a lot of swings. Also, pressure will be extremely low, less than 1% of sea level atmospheric pressure. So I guess since we are now at 12V the original question is irrelevant now, but still wanted to give you the info. Thanks!
JFC
