Transcription of Snubber circuit design methods - Rohm
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Snubber circuit design methods - Rohm
1/6 2017 ROHM Co., Ltd. No. 60AP001E 2020 ROHM Co., Ltd. No. 62AN037E Application Note SiC MOSFET Snubber circuit design methods SiC MOSFET is getting more popular in applications where fast and efficient switching is required, such as power supply applications. On the other hand, the fast switching capability causes high dv/dt and di/dt, which couple with stray inductance of package and surrounding circuit , resulting in large surge voltage and/or current between drain and source terminals of the MOSFET. The surge voltage and current have to be controlled to not exceed the maximum rated voltage/current of the device.
can be increased, and therefore, the clamping effectiveness. C SNB and R SNB are determined by equation (2) and (3) respectively. Power consumption of R SNB is determined by following equation (6) which does not have the second term of equation (4) including C SNB and f sw. This leads efficient clamping capability and makes higher frequency of f sw
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