JAJSKX1A january 2015 – december 2020 UCC28700-Q1
PRODUCTION DATA
The current-sense pin is connected through a series resistor (RLC) to the current-sense resistor (RCS). The current-sense threshold is 0.75 V for IPP(max) and 0.25 V for IPP(min). The series resistor RLC provides the function of feed-forward line compensation to eliminate change in IPP due to change in di/dt and the propagation delay of the internal comparator and MOSFET turn-off time. There is an internal leading-edge blanking time of 235 ns to eliminate sensitivity to the MOSFET turn-on current spike. It should not be necessary to place a bypass capacitor on the CS pin. The value of RCS is determined by the target output current in constant-current (CC) regulation. The values of RCS and RLC can be determined by the equations below. The term ηXFMR is intended to account for the energy stored in the transformer but not delivered to the secondary. This includes transformer resistance and core loss, bias power, and primary-to-secondary leakage ratio.
Example: With a transformer core and winding loss of 5%, primary-to-secondary leakage inductance of 3.5%, and bias power to output power ratio of 1.5%. The ηXFMR value is approximately: 1 - 0.05 - 0.035 - 0.015 = 0.9.
where
where