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hameeds01
Joined: 23 Aug 2005
Posts: 308
Helped: 15
Location: NUST Islamabad
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 31 Oct 2009 6:31 USB port current ?? |
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how much maximum current that i can draw from the USB port of my labtop??
what gonna happen if in case i short the USB supply lines 5Volts ????
does it has any protection circuit in it to protect the laptop??
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Jack// ani
Joined: 02 Dec 2004
Posts: 488
Helped: 25
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31 Oct 2009 7:01 USB port current ?? |
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Maximum current you can drain vary from 100mA-500mA(max) and it is overcurrent protected.
My desktop machine use to reboot if I drain too much current, although I never actually measured it!
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nandhu015
Joined: 11 Feb 2006
Posts: 641
Helped: 46
Location: Tamilnadu, India
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31 Oct 2009 7:48 Re: USB port current ?? |
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hi
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| My desktop machine use to reboot if I drain too much current |
My laptop powersdown usb device and give me a warning that usb device is consuming high current
Nandhu
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xuan1982
Joined: 31 Oct 2009
Posts: 2
Location: Shenzhen,GuangDong,China
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31 Oct 2009 11:35 Re: USB port current ?? |
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| hameeds01 wrote: |
how much maximum current that i can draw from the USB port of my labtop??
what gonna happen if in case i short the USB supply lines 5Volts ????
does it has any protection circuit in it to protect the laptop?? |
laptop usually support 5V. mainborad usaually has protection circuit.
but i don't suggest you do it.
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pranam77
Joined: 22 Apr 2008
Posts: 1073
Helped: 94
Location: Mangalore(India)
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31 Oct 2009 14:28 USB port current ?? |
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| New versions of mother boards have a poly fuse in series to protect the USB port from over loading. In case a load is connected above the set limit, a popout window on the screen warns the user about the same. But do always do experiments at your own risks. Cheers
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elrayes
Joined: 03 Jun 2008
Posts: 164
Helped: 8
Location: Egypt
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31 Oct 2009 15:59 USB port current ?? |
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| usually for USB 2.0 initially supplies 100 mA without request, if you need more current the USB device must request this from the hub in terms of units, each unit 100 mA till you get the maximum which is 500 mA.
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31 Oct 2009 15:59 Ads |
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Jack// ani
Joined: 02 Dec 2004
Posts: 488
Helped: 25
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01 Nov 2009 9:46 Re: USB port current ?? |
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| pranam77 wrote: |
| New versions of mother boards have a poly fuse in series to protect the USB port from over loading. In case a load is connected above the set limit, a popout window on the screen warns the user about the same. But do always do experiments at your own risks. Cheers |
Nice to know that.
It very well explains are my old desktop use to reboot instead of giving over current drain warning as mentioned by nandhu015.
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