We are using the LMR51440SDRRR for the purpose of converting 24V to 3.9V.
As per our understanding if we use a 0 Ohm resistor between RT pin and ground, the output the frequency of the regulator should be 1MHz, but under our observation it near 500KHz for current above 500mA(approximately). Why does the frequency is not matching the set frequency.
Another observation is that when the load increased beyond 500mA the voltage waveform seems to have a lower frequency component (near 10KHz) along with the ripple frequency, why does this lower frequency component occur in the output?