source:Industry News Popular:adapter release time:2021-04-08 14:56:45 Article author:sznbone
USB type-c devices are becoming more and more popular in the real world, and many popular mobile phones and tablets use USB type-c interfaces. I expect that the number of products using the USB Type-C interface will increase rapidly in the next few years.
Why is the power 15W (5V3A)?
In addition to having a plug that can be plugged in both front and back, the USB Type-C adapter can provide more power than any previous USB version. Although USB Type-C can support up to 100W of power for USB 3.1 and USB charging, system designers must carefully select features to maintain a reasonable overall cost.
The USB Type-C interface uses 15W power, which is six times the charging rate of the standard USB 2.0.
For most smartphones and tablets, 15W is sufficient and the cost is reasonable.
Diode rectification and PSR are widely used in adapters whose current is less than 2A
The normal power of the previous mobile phone power adapter is 5V/2A or lower. Because of its simplicity, opto-isolators and programmable references can be eliminated, primary side regulation (PSR) is often used for AC/DC conversion. Because the load current is not high, a diode rectifier is used at this power level.
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