Given,
Please take a look at UCC38C42 Family of High-Speed, BiCMOS Current Mode PWM Controllers, App Note by Bill Andreycak. UC2842 has longevity as a legacy PWM controller and this is favored in many industrial, mil, space applications where long term reliability, familiarity, robustness and product qualification are sometimes more important than converting to the newer BiCMOS version. On the other, there are notable performance advantages realized when converting from UC to UCC and some of these are captured in the table below:
The newer UCC28C53 is a BiCMOS PWM controller improved for compatibility with SiC MOSFETs. SiC MOSFETs operate at much higher VGS compared to Si MOSFETs. The PWM controller and gate driver need to be compatible with the higher VGS requirements necessary to fully enhance SiC MOSFETs to their lowest RDS levels. For UCC28C53 this means higher UVLO on/off thresholds and higher VDD max voltage rating compatible with SiC MOSFETs as summarized by the table below. Important to not that UC384y, UCC28C4y and UCC28C5y are all pin-to-pin compatible, drop in replacements for each other.
Regards,
Steve M
