应用与设计

USB 2.0

详情介绍

Circuit Protection of USB 2.0

解决方案:
解决方案:
解决方案:
解决方案:
解决方案:
解决方案:
解决方案:
解决方案:
解决方案:


设计说明:

保护应用:
The data signals used in a USB 2.0 port vary between 0V to +0.5V, with a maximum data rate of 480Mbps.

到达该数据传输率时,应最小化抑制器的电容量。

需避免受到ESD影响的信号线包括D+和D-。 同时也需要防止5VDC电源总线受到ESD和过电流的危害。
解决方案说明:
As shown at the left, the data lines can be protected from voltage transients through a range of Littelfuse devices.

For lowest possible clamping voltage (lowest dynamic resistance), Littelfuse TVS Diode Array (SPA) devices should be used; for lowest possible capacitance Littlfuse PulseGuard (PGB) devices should be used:

Solution A) Two-channel Silicon (SPA) TVS Diode Array solution (SP3003 series shown)

Solution B) By a two-channel Polymeric PulseGuard suppressor (PGB102ST23 device)

Solution C) By discrete Polymeric PulseGuard suppressors in pair (PGB1010402 or 0603 devices)
配套解决方案:
Other protective solutions are recommended. For the power bus a resettable 1206L Series PTC is advised for overcurrent protection, and an MLA Series Multiplayer Varistor for ESD voltage transient suppression.
监管问题:
IEC 61000-4-2是最适合此接口的标准规范。 通过该测试可证明终端产品不易受到ESD危害。
特性:
不适用。
应用警告:
不适用。