Hi,
I want to use LTC3878 and LTC3729 in my design.These component have RUN/SS pin. Before advance design, I tried to simulate macro model in LTspice. Of course, these models operated properly. When Css (soft-start capacitor) was changed SS time increased and decreased according capacitor value. But I am going to use enable signal for these component in design. I connected enable signal (logic signal) to RUN/SS pin , soft start time did not change for any capacitor value. When enable signal was applied output of component rapidly increased and overshoot occurred. How can I solve this problem? Is there any probability on spice model have a fault?
Best regards.
