TIDUF28 November 2023
The six GaN-FETs LMG3422R030 devices are mounted on top of the PCB, as well as the three phase current shunts and the high-voltage supply input connector J3, the 24-V input supply connector J5, the three-phase motor connector J4, and the connectors J6 to J9 and J11 to an external MCU, as well as J1 and J2 to interface to a F28379D C2000 MCU controlCARD.
The PCB bottom side shows the three isolated modulators AMC1306M25, the resistor dividers with the AMC1035 delta-sigma modulator for the DC-link voltage sensing and the six digital isolators ISO7741 for PWM level shifting. The 6 holes shown on the left and right allow for mounting a heat sink on the bottom-side of the PCB to connect to the six copper planes on the bottom-cooled LMG3422R030 GaN-FETs.