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Protect current-sense amplifiers against overvoltage transients

Posted: 27 Apr 2009 ?? ?Print Version ?Bookmark and Share

Keywords:overvoltage? amplifiers current-sense? car battery?

Some current-sense amplifiers encounter overvoltages frequently. A current-sense amplifier that monitors battery-discharge currents in an automobile, for example, must withstand the high-voltage load-dump pulses produced when loads are disconnected from the battery, causing inductive spikes and overvoltages to appear at the output of the alternator. If these pulses exceed the amplifier's common-mode voltage, then one must provide external circuitry to protect the amplifier.

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