Global Sources
EE Times-India
Stay in touch with EE Times India
EE Times-India > Embedded

Surge testing solid-state USB switches and other over-current protectors

Posted: 28 Jul 2009     Print Version  Bookmark and Share

Keywords:USB switches  solid state USB  over-current protector 

Solid-state over-current protection ICs, such as USB and card-slot power switches, offer a simple and robust means of protecting pins at risk of overloads or shorts during a product's testing or from customer abuse. The degree of protection is not without limits, and this article explores those limits.

With a 1.2A current limit, one would think that a circuit-protection IC could maintain complete control in the event of a fault or short. The reality is that the current limit usually demonstrates a delay time before the actual shut-off occurs. During a hard short, the current can rise very rapidly, first hitting the DC limit and starting to turn the switch off. (The DC limit is typically an accurate, but slow threshold. A slow threshold avoids nuisance trips from inrush and other spurious events.) A short time later the switch opens, but not before reaching a peak current that can be much higher than the DC limit. Low-inductance leads can cause the current to rise even faster.

View the PDF document for more information.

Comment on "Surge testing solid-state USB switch..."
*  You can enter [0] more charecters.
*Verify code:


Visit Asia Webinars to learn about the latest in technology and get practical design tips.


Go to top             Connect on Facebook      Follow us on Twitter      Follow us on Orkut

Back to Top