Re: Did USB3 fry my low power device?
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Subject: Re: Did USB3 fry my low power device?
Date: 9/29/2010 5:47:29 PM (GMT-7)
IP Address: 188.8.131.52
In Reply to: Re: Did USB3 fry my low power device? posted by
Sorry, the post above wasn't complete.
"There should have been a current limiter in the HD TV stick "
The memory sticks controller chip still works . Just no memory. I can see the stick but if I try to access it I get " Please insert disk". No apparent current limiting/regulation in it.
It seems the chip in the HD TV that blew was exactly that; a current/voltage regulator/limiter:plus on/off function.
The concept of headroom for the power supply hasn't escaped me, none the less I gather you can over do it [over engineer]. I studied the USB 2 specs some time back when an aquaintance asked about the possibility of hanging various lights off a USB2 connection. It's basically 500 Ma max.
USB 3 is over three times that. I couldn't find a max current limit in the specs for the regulator/limiter chip in the HD TV stick but I doubt it's anything much above 1 > 1.2 amp.
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