TPS62085 Switching Frequency

DCS-Control does not directly set the switching frequency, so some variation is expected.  It is ok for the IC to run at 1.4 MHz.

Comparing to our EVM, this seems a bit lower than you measure.  Are you testing on the EVM or your own PCB?  Differences in the layout can affect the frequency.

I checked on our PCB. I don't have EVM.

Couid you estimate switching frequency on the following conditions?

Vin=3.3V, Vout=1.8V (Rtop=200k, Rbtom=160k),L=1uH, Cout=10uF

Hi, Chris.

Thank you for measurement data.

I'd like to make sure that the inductor at the time of measurement is 1uH.

I checked switching frequency of TPS62085 on TI’s EVM.

When I changed only inductor from 0.47uH to 1uH, Cout was still 22uF,  the frequency was similar to your result.

But the capacitor was also changed from 22uF to 10uF, inductor was 1uH, switching frequency became late was 1.4MHz.

Although the coil has already obtained the reply with 1uH, what is the capacity of a capacitor when you measure?