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eFuse reverse voltage protection scheme

Posted: 18 Jun 2009     Print Version  Bookmark and Share

Keywords:eFuses  polyfuse  TVS clamping diode 

ON Semiconductor claims that its eFuses offer low cost, low impedance solutions for bus protection and offer much faster protection than many fuse solutions. They are an effective replacement for a polyfuse and TVS clamping diode.

One area in which they differ in performance is reverse polarity protection. While a TVS device and polyfuse will protect against reverse voltages, the nature of an integrated semiconductor device does not inherently allow for this type of protection.

This simple circuit allows the device to protect against reverse voltage situations by simply blocking the reverse voltage. This is equivalent of the action of a poly fuse only with less leakage. In comparison to a mechanical fuse, this is a far superior solution since the mechanical fuse will not reset and this circuit will automatically reset when the correct voltage is applied.

View the PDF document for more information.

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