ZHCS779C March 2012 – July 2025 UCC28070 , UCC28070A
PRODUCTION DATA
Interleaved-PFC techniques dramatically reduce input and output ripple current caused by the PFC boost inductor, which allows the circuit to use smaller and less expensive filters. To maximize the benefits of interleaving, the output filter capacitor must be located after the two phases allowing the current of each phase to be combined together before entering the boost capacitor. Similar to other power-management devices, when routing the PCB it is important to use star grounding techniques and to keep filter and high frequency bypass capacitors as close to device pins and ground as possible. To minimize the possibility of interference caused by magnetic coupling from the boost inductor, the device must be located at least 1 inch away from the boost inductor. TI recommends not to place the device underneath magnetic elements.