LMG3422R030: about Design Guide: TIDA-010210

Hello Teruhito,

TIDA-010210 uses mainly GaN FETS for high frequency switching.

• Six power cards switching at 100 kHz containing GaN power switching devices and isolated bias power supplies.

• Three power cards switching at 100 Hz and 120 Hz containing Si power switching devices, gate drivers and isolated bias power supplies.

As shown in the architecture overview, the main switching device needs to support only half the full switching voltage. To support the 800-V DC link voltage of this design, use 600-V rated devices. The switches Q1, Q5, Q4, and Q6 are high-frequency switching and hence must be GaN devices. However, the switches Q2 and Q3 are only switching at 100 Hz and 120 Hz and can use Si MOSFETs.

Here the High Frequency switches are GaN FETS and Low Frequency switches are Si Mosfets.

Regards,

Adithya