DigiKey-eMag-Sustainability and Energy Harvesting-Vol 15

MOS + SIC DIODE

MASTERGAN4

0.66 cm² Diode DPAK or TO220

Power devices area

0.81 cm²

33 cm² Copper area to have 19°C/W

19.7 cm² Copper area to have 24°C/W

Copper area for thermal management

Power inductor footprint

11.2 cm²

Overall Area

45.5 cm²

31.71 cm²

Table 1: Size comparison for GaN and Silicon MOSFET

Table 1 compares the silicon solution with the MASTERGAN4 based solution. As can be seen, more than 30% overall PCB area reduction is shown with the GaN design implementation. The results show one path that can be taken with GaN in this inverse buck topology. Increasing the switching frequency above 70 kHz can decrease the output inductor and capacitor size at the expense of higher driving and switching losses. At a higher frequency and reduced filter size, electrolytic capacitors can be replaced with more reliable and larger ceramic capacitors. The tradeoff between filter capacitor and buck inductor size can be optimized based on the switching frequency required by the target application.

implemented with MASTERGAN4 creates a solution for increased power density and efficiency, but let the results discussed below speak for themselves. Experimental Results: The efficiency plots in Figure 4 show the advantages of the proposed solution vs. a traditional silicon solution as a function of the LED string voltage for output currents of 0.5 A and 1 A. The efficiency of MASTERGAN4 stays at or above 96.8% across the entire LED string voltage range. It is possible to observe that across all power levels the gain in efficiency is maximized thanks to the low conduction losses as well as the minimal driving and switching losses of the GaN solution.

Conclusions This article discussed the implementation of an inverse buck topology for LED lighting applications based on MASTERGAN4. The system in package configuration has 650 V, 225 mΩ GaN transistors in half-bridge configuration and dedicated gate drivers. The GaN solution vs. silicon shows higher efficiency and reduced PCB area. MasterGaN is the ideal solution for a compact, high efficiency and high-power inverse buck implementation for lighting applications.

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