Summary:
As the computer industry moves toward DC-DC converters that can deliver up to 200A at 1V, PCB layout technology needs to meet the requirements of this challenging new converter. In order to compare the effects of various wiring defects, we focus on the effects of parasitic inductance in the circuit, especially those related to the source, drain, and gate of the switching MOSFET. We built a PCB for testing a DC-DC converter that can input 12V DC and convert it to 1.3V with an output current of up to 20A. We use a plug-in board to assemble and change the inductance at each MOSFET electrode separately or simultaneously (Figure 1). We chose to use the inductance value as a percentage of the total inductance of a specially designed 2-inch board, rather than the actual value, because the wiring personnel only know the length of a particular trace and do not necessarily know the value of its inductance.
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