ExpressCard 转 USB3.0 板卡
I designed it to use the ExpressCard interface on my laptop. This interface has been idle and there are not enough USB ports, so I came up with the idea of adding a USB port to my laptop.
But because this interface is too old,
So I have been looking for information about the plug for a long time, and finally found the information about the ExpressCard plug. I would also like to thank all my friends for their help!
ExpressCard plug link: Imported original 1759181-1 EXPRESS interface express card slot 26P bayonet connector
https://item.taobao.com/item.htm?spm=a1z0d.6639537.1997196601.13.6d677484nKB8Gs&id=606952698777
Because the ExpressCard interface does not provide a 5V power supply, there is a 3.3V to 5V boost circuit using QX2303 with a maximum switching frequency of 300KHZ.
The output terminal has a PTC self-restoring fuse with a holding current of 750ma and a tripping current of 1.2A to protect the QX2303
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