MLCC Dynamic DC Bias Model for Accurate Simulations

July 08, 2014 by Jeff Shepard

TDK Corporation has expanded its technical support tools for MLCCs: The new DC Bias Model enables designers to simulate DC bias characteristics of MLCCs, even when the DC bias applied to the MLCCs varies. As a result of TDK's advanced electronic component model, the capacitance in the simulation changes dynamically with a changing DC bias voltage, an industry first. Until now, the available simulation libraries only offered models for one specific DC bias voltage at a time. The new DC Bias Model is available in the HSPICE, LTspice and PSpice formats for the most commonly used circuit simulator software and can be downloaded free of charge from the TDK Product Center.

With its existing technical support tools for MLCCs, TDK already provides data that enable the simulation of frequency characteristics. Because the effective capacitance of high-permittivity MLCCs (Class 2) changes when a DC voltage is applied, the accurate simulation of these MLCCs in circuits must also reflect their behavior when DC bias voltage is applied. For this reason, TDK’s dynamic electronic component model is designed to simulate both the frequency and DC bias characteristics of MLCCs.

Used together with the DC Super-imposition Model, which enables the simulation of both frequency and DC superimposition characteristics of TDK inductors, the new MLCC tool enhances the accuracy of circuit simulation for power supply circuits. Designers thus benefit from a further increased efficiency of electronic circuit design.