Tool/software:
Dear TI support team
I have recently designed a small PCB to convert an input voltage ranging from 44 to 48V down to 41V at the output. For this purpose I have chosen the LMR38015-Q1 since it supports a high maximum duty cycle of 97% which is needed for my particular application. Below you can find the schematic of my design.
Unfortunately, I have mounted the fixed 5V version of this IC (LMR38015FS5QDRRRQ1) instead of the adjustable version (LMR38015SQDRRRQ1) to my board due to a mistake during the ordering process.
By removing R5 and replacing R4 with a 0R resistor I meanwhile managed to stabilize my design to provide stable 5V at the output terminals.
In order to avoid replacing the IC with the adjustable version and still achieving 41V at the output, I was wondering if it is possible to use the LMR38015FS5QDRRRQ1 for this purpose. In particular I am thinking about changing the resistor divider consisting of R4 and R5 in such a manner that I end up with 5V at the FB pin for an output voltage of 41V. To do so I would choose R4 to 76.8kR and R5 to 10.7kR to end up with the required division ratio of 8.2:1.
Do you have any concerns with respect to my approach? I am aware that I am planning to operate the IC under conditions which this particular part number is not intended for but maybe it is still possible for my purposes of evaluating the performance of the IC.
Thank you for your support and have a great day!
Best regards
Leonhard
