Part Number: LM5116
I am developing a DC DC controller with input voltage ranges from 15V to 100V with output voltage of 14V. I have configured the board for about 15A load current. I developed around 5 boards for testing. My observations were as follows:
1. Board 1 and 2 worked fine and i was able to get an output voltage of 14V. I checked the gate terminal voltage of high side MOSFET and found it to be around 10V in all three boards.
2. Board 3,4,5 gave only 4.65V output, even though my components were one to one the same as Board1 and Board2. The gate terminal voltage of high side MOSFET was around 4.6V.
What might be the fault in these three boards? is there any other parameters that i should verify? i checked the UVLO pin voltage which is above 1.215V in all three cases. I have almost implemented the same circuit as that of LM5116 evaluation board except for the Inductor and MOSFET along with changes in feedback loop.
I verified my circuit about 3 to 4 times but found everything almost the same.
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
In reply to Timothy Hegarty:
thanks for the reply.
I did verify the VCC voltage but seems to be the same as that of the gate voltage toggling at 4.6V approximately.
is it because of any other fault in the board? should i cross check any other parameter?
In reply to Anushree N:
I have attached the TINA file for your reference. Please let me know few solutions regarding the problem.
-AnushreeNew Design - Copy.tsc
Hi tim, I had attached the TINA file of my schematic for your review. Is the schematic OK? Please review and let me know if it is OK.
In the meanwhile i shall check using the quickstart tool as well. Regards Anushree
In reply to Anushree n:
Thank you for your reply.
I have filled the quickstart file and found some values to be different from the one used in our board. I have made the necessary changes as well, and will test accordingly.
Also, i will test without connecting VOUT to VCCX, and analyze the problem as well.
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.