The interleaved boost PFC is an alternate PFC topology used in HVAC systems. The interleaved boost PFC features two boost converters operating 180 degrees out of phase and is typically used for higher power applications. This topology can also offer efficiency improvements at the cost of additional components. The gate driver requirements for this topology is similar to the traditional boost PFC; however, an additional low-side FET is needed for the second boost converter. To achieve this, a dual-channel low-side gate driver is commonly used. Figure 2-2 shows an example of an interleaved boost PFC.

Figure 2-2 Interleaved Boost PFC with UCC27624

The UCC27624 can be used to drive the FETs in an interleaved boost PFC. Each of the two channels has a high drive strength, capable of outputting 5A source and 5A sink peak currents. This driver is also rated up to 30V VDD, allowing for greater flexibility in design. Furthermore, the driver has a rise time of 6ns, fall time of 10ns, propagation delay of 17ns, and delay matching of 1ns to for fast and efficient switching in HVAC systems. Table 2-2 features a comparison between UCC27624 and the leading competitors