Hello,I’m designing a DC-DC boost converter from 5V to ±15V. A capacitor needs to be directly added to the output capacitor and the rectifier diode for decoupling. When this capacitor is added to MPSmart for simulation, an error id:5020 will be output, indicating that it is checking the circuit and the initial conditions. If this capacitor is removed, my circuit can be simulated correctly. To verify the stability of the circuit, I want to know how I can add this capacitor to my simulation, or whether I need to add this capacitor.
Hi Jiang,
Thank you for posting to the MPS Technical Forum! What value is the capacitor you are trying to add? Also, could you share your simulation schematic?
Thank you,
Isabella
hello，
I designed a DC-DC boost converter. Its input is 12V and the output is 48V. The data table of MP3425 is recommended to use a 33u inductor, with an output of 22u, Rcomp60k, and Ccomp10nf. Due to the consideration of the subsequent load, I need to replace the output capacitor with 470uf or 100uf. How to calculate the appropriate compensation network through formulas and conduct simulations? The attached picture is my simulation diagram. Thank you!
Thank you for providing your simulation. Did you test your 100uF output capacitance with the simulation’s original compensation network, and were there still simulation errors then? Also, what values are you using for your load current?
Hello,
Yes, I used 60K and 10nf as the compensation network to test Cout100uf, but it still reported an error. The load current I use is 0.4A.