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Part Number: LM5085-Q1
I am designing a power supply with 12V input using LM5085-Q1 chip. Nominal output for the power supply should be 9V, but also I would like to place a variable resistor in a feedback loop so I can change the output voltage from 9V up to 12V (or as close to 12V as it can get). Are there any potentially unstable situations that I should consider, especially while using a configuration of duty cycle near 100% or 100%?
As long as your input voltage is stable, the switcher should be stable. If you plan to adjust Vout while operating, I would use a summing resistor into the FB node and control Vout with a DC voltage. Otherwise Changing the bottom FB resistor should be just fine. Make sure you pay close attention to the layout guidelines. I have added some of my own for your to follow in attached.
LM5085 Floor plan.tif
Hope this helps?
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