I have general question about changing feedback resister.
DCDC has external feedback resiter to set output voltage.
If we change resister value e.g. from AΩ to BΩ while DCDC is working, are there any problem?
What my customer wants to do is below
--> 6V/400mA out
--> 10V/800mA out
feedback resister is changed by external FET.
Please let me know if you have any concern?
generally speaking you can do that. For large output voltage changes you may see some overshoot or undershoot on the transition, depending on how fast the FET switches. Also, this works better using voltage mode control as the lower feedback resistor is not part of the small signal loop. If you use current mode control, make sure the compensation works for both 6 V and 10 V cases.
BSR-CCP LV/MV DC/DC Applications
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.