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November 2012 Doc ID 1703 Rev 3 1/15
AN280
Application note
Controlling voltage transients in full-bridge driver applications
By Thomas Hopkins
Introduction
In applications that involve fast switching of inductive loads, designers must consider the
voltage transients that are generated in such applications.To insure a reliable design, the
voltage transients must be limited to a level that is within the safe operating conditions of the
switching device. This application note discusses the sources of voltage transients in full-
bridge applications and techniques that can be used to limit these overvoltage conditions to
safe levels. Special attention is given to applications using monolithic implementations of
full-bridge circuits like the STMicroelectronics L6201, L6202 and L6203. In this note the
example circuits generally show the L6203, but the same circuit can be used with the L6201
and the L6202.
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