SLUSD37E October 2017 – November 2019 UCC28056
The UCC28056 controller includes two overcurrent protection mechanisms to deliver safe robust protection without danger of false tripping during operating transients. During the ON period of the switch, a current sense resistor (RCS) connected in the source lead of the power switch senses the inductor current. The ZCD/CS pin detects the voltage across the current sense resistor. Equation 12 dscribes the current sense voltage signal applied to the ZCD/CS pin. Typically the second term in the bracket is much smaller than current sense resitance value (RCS ) and can be neglected.