ZHCU578 October 2018
Due to the relatively high peak switch currents in this design, the equation based on current limit results in a much lower value. A VIIS(LIMIT) value of 70 mV is used both for high current demand during load switching from low beam to high beam and for power dissipation purpose. The value can be found using Equation 7:
For this design, a value of 0.008 Ω is selected for R9.