Tool/software: WEBENCH® Design Tools
Hi team,
I am using webench to design power from below specs,
Vin=10.8-28V, Vo=5V/1A, the feedback resistor is 56.2k//10k. For internal voltage reference is 0.8V, I think the resistor should be 52.5k//10k. Please help clarify it in our database. I also want to know if I choose47k/8.87k, will it have any problem? Thanks.
Hi Lin_Charles,
You are correct that 52.5K is the ideal value. I looked at BOM tab of the design and tried to change the value and it shows the target resistance value to be 52.5K. The 56.2K is the closest value to that target that is the Webench library. You can add a custom part number to meet your real life design. The two resistors values you mentioned should be fine for regulation. Since they are smaller, there will be more leakage current through the feedback resistors.
Regards,
Ethan
