Spike_suppressor_for_unregulated_power_supplies

Published:2009/7/24 13:56:00 Author:Jessie | From:SeekIC

This circuit suppresses transients in unregulated supplies. Zener D1 clamps the input voltage to the regulator, and L1 limits the current through D1 during the transient. This circuit will clamp 70-V 4-ms transients. The value of L1=dVdt/I, where dV is the voltage by which the input transient exceeds the breakdown voltage of D1, dt is the duration of the transient, and I is the peak current of D1. National Semiconductor, Linear Applications Handbook, 1991, p. 47.



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