Supercomputing for Everyone
aolofsson wrote:-Modify the USB cable to the powered hub to remove the VBUS line
tnt wrote:- Did you confirm U13 is the only thing fried ? Fron the schematic I don't see what else would have an issue and U13 is SO8, so easy to replace.
tnt wrote:- I assume you mean schottky and not zener ? In any case, it's not ideal because for powered devices this will get a ~0.3v drop min at 500mA, which added to other tolerances (in the cable / in the input / ...) might get below the 4.5v spec at the device.
tnt wrote:- What about soldering a schottky from U13 output to it's input. Reverse current flow would go through that path, bypassing U13. Sure the powered device might have an issue with drawing 1A from it but the parallella would be OK and this is a workaround easy enough to do with a bit of soldering experience.
tnt wrote:- I'm still a bit surprised it would die ... datasheet for MIC2025 states "Reverse current flow blocking (no “body diode”)" and "Short-circuit protection with thermal shutdown". You'd think either the reverse blocking or thermal shutdown would have prevented it from dying.
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