Which is the right tool to use

08232016, 11:41 AM
Post: #1




Which is the right tool to use
Hello guys
I am confronted with a problem I can solve just by using the prime as an ordinary calculator but I could imagine that there is a builtin tool for doing the job. Maybe a user program would be an option, but I am so busy at work atm that messing around with the programming does not seem to be a good idea. The problem is that: I need to design several switching supplies with different feedback voltages and different bias currents on them. What I want to solve is: (R1+R2)/R2 == U0/Ufb. U0 is given Ufb is given R2 is given by myself and in the range of, say, 120k..270k. Predefining R2 values so that they match E24 would be sugar on top. Is there builtin feature that I can quickly use? thanks 

08232016, 12:44 PM
(This post was last modified: 08232016 12:54 PM by Didier Lachieze.)
Post: #2




RE: Which is the right tool to use
You can use the spreadsheet application. See the attached simple example where U0 and Ufb are named cells, column C contains the R2 predefined values (you can put what you want here) and column D has the columnwide formula: "=C:C*((U0/Ufb)1)"
Just enter the values of U0 and Ufb you want to design for and youâ€™ll get in columns C and D the pairs of R2/R1 values. You can customize this spreadsheet as you need. leprechaun.hpappdir.zip (Size: 945 bytes / Downloads: 7) 

08242016, 05:57 AM
Post: #3




RE: Which is the right tool to use
Thank you for the suggestion!


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