Comment on Will there be power issues if I plug an unpowered USB hub into a powered on or vice versa
NeoNachtwaechter@lemmy.world 10 months ago
Read all their electrical specs carefully!
Usually, powered hubs can provide only what is needed to fulfill the (old) USB standard of 5V, 1A, which is only a little snack for today’s hungry devices.
But if the powered hub is actually stronger than the standard of 5V, 1A, then the powerless hub may burn out.
That’s why today’s (much stronger) chargers are no hubs anymore.
jjagaimo@lemmy.ca 10 months ago
That is not how devices like this work; plugging a 5V 3A device into a 5V 1A port means you can only pull 1A. Going beyond that will either trip a fuse on the board or cause the port to shut off, or potentially keep working with diminished voltage.
If it is USB PD or QC then the devices may negotiate a higher voltage, but for standard hubs like these it’s most likely to just use a USB A port and 5V.
NeoNachtwaechter@lemmy.world 10 months ago
I have seen dead hubs, but I have never seen one with such fuses.
jjagaimo@lemmy.ca 10 months ago
Many have PTC or poly fuses that can self reset, so a port may briefly stop working. Some are built into the hub ICs or are in the form of a surface mount resistor