Series Protection Against High Voltage Transients
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In many low-voltage applications, undesired voltage
overshoots may occur at the input during the circuit operation. To avoid the
harm of this overvoltage, we generally use parallel clamps such as fuses or other
current limiting devices. The disadvantage of the parallel protection may be resetting
or renewing the protector component. This circuit provides a series protection that turns off the power switch using a series
connected high voltage MOSFET (n-channel – Q1) power switch and a fast
overvoltage detector IC, MAX1614. The series connected rectifier diode D1 and the power switch is
together capable of protecting the load up to +/- 500V of either polarity.
Source: www.maxim-ic.com/appnotes.cfm/an_pk/347
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