The UCC28070A device is an extended frequency range derivative of the UCC28070 device,
capable of operating at low switching frequencies desired for IGBT power-switch based PFC
converters in high-power applications.
The UCC28070A device is capable of operating at frequencies from 10 kHz to 300 kHz, thus
extending the range of operation compared to the UCC28070 device whose minimum operating frequency
was limited to 30 kHz. All the other features and benefits of the UCC28070 device are also
available in the UCC28070A device. The 180° out-of-phase interleaved operation generates
substantial reduction in input and output ripple currents and conducted EMI filtering becomes
easier and less expensive.
Like the UCC28070 device, the UCC28070A device also features multiple innovations
including current synthesis and quantized voltage feedforward to promote performance enhancements
in PF, efficiency, THD, and transient response. Features including frequency dithering, clock
synchronization, and slew rate enhancement further expand the potential performance enhancements.
All protection features in the UCC28070 device such as output overvoltage detection, programmable
peak-current limit, undervoltage lockout, and open-loop protection are available in the UCC28070A
device as well.