Welcome to the Non-Isolated DC/DC Section of the TI E2E Support Community. Ask questions, share knowledge, explore ideas, and help solve problems with fellow engineers. To post a question, click on the forum tab then "New Post".
Q: TPS63030 FB pin resistor values by 1038028
Customer sees note in d/s page 14 - "it is recommended to keep the value of this resistor (R2) in the range of 200k"
Customer has used lower values for R1 and R2. E.g. he has used 1k for R2 and 4k for R1. Vout=2V5 in this case. He asks are these low resistor values ok?
(He and I think it is, because normally the problem is if you have too high a resistor value, but due to the precise wording of the d/s we need to check)
A: Re: TPS63030 FB pin resistor values by 1090425
This is ok. His light load efficiency will be much worse as he is burning 200 times as much power in the FB divider.
If he is using a Cff (feedforward cap), he should increase is proportionally to the decrease in R1. So, if R1 were 200k and Cff were 10pF, now Cff should be 500pF with R1 = 4k.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.