The UCC28070 and the UCC28070A are power factor correction ICs each of which controls two CCM (Continuous Conduction Mode) Boost PFC power stages operating 180° out of phase with each other. This interleaving action reduces the input and output ripple currents so that less EMI filtering is needed and allows operation at higher power levels than a non-interleaved solution.

Except for their respective switching frequency ranges, the UCC28070 and the UCC28070A are interchangeable devices that can operate over a wide range of frequencies, making them suitable for use with both MOSFET and IGBT power switches. The UCC28070A is capable of operating down to 10kHz minimum switching frequency, while the UCC28070 is limited to 30kHz minimum switching frequency.

Except as noted, all references to UCC28070A apply equally to the UCC28070 throughout this document. This device is especially suited to high-performance, high-power, PFC applications where the use of Average Current Mode PWM control gives low THDi. Multiple controllers can be synchronized for use in higher-power applications where more than two interleaved power stages are needed.