Industrial HVAC systems are very similar to residential HVAC systems, with the main difference being size and power level of the system. Commercial buildings often have access to three-phase power, meaning the AC voltage is higher. Thus the DC voltage output from the PFC is higher as well, typically 800V. Though isolated gate drivers are often used to drive the high-side of the 800V bus voltage systems, a non-isolated gate driver can be implemented on the low-side to offer cost-savings. Further, a non-isolated gate driver can also be used to drive the high-side when paired with a digital isolator. Figure 3-2 shows the UCC57108C implemented in both low-side and high-side.

Higher power systems often use IGBTs and Silicon Carbide (SiC) FETs. To protect these higher switching power devices, TI offers the UCC57108 (8V UVLO) and UCC57102 (12V UVLO), which are low-side gate drivers with desaturation (DESAT) protection. DESAT protection uses internal circuitry to detect short-circuit events, shutting down the gate driver output to protect the switching power device. To understand more about DESAT protection, read Understanding the Short Circuit Protection for Silicon Carbide MOSFETs.