A new discontinuous Current Source Driver for high frequency power MOSFETs
This paper proposes a new Current Source Driver (CSD) with discontinuous inductor current. Compared to other CSDs proposed in the previous work, the most important advantage of the proposed CSD is the small inductance (typically, 20nH at 1MHz switching frequency). This translates into the footprint reduction of as much as 90%. Other features of the proposed CSD includes: 1) fast switching speed and reduced switching loss; 2) discontinuous inductor current with low circulating loss; 3) gate energy recovery; 4) wide range of duty cycle and switching frequency. The experimental results verified the functionality of the proposed CSD. At 1.3V output, the new CSD improves the efficiency from 80.7% using a conventional driver to 85.7% at 25A output, and at 30A output, from 77.9% to 84.4%.