Part Number:TPS65265
Hi,
I am testing on a board that uses the TPS65265 to generate several voltages.
One of our supplies generated by the TPS65265, which has a nominal voltage of 1.2V, has a nominal current load of 50mA, but has transient loads of ~400mA.
We have found that there are dips on the 1V2 supply that last several hundred microseconds, and have been observed to be ~150mV from the nominal value. These deviations are causing issues for digital circuitry powered by the TPS65265
In the attached oscilloscope screenshot, green channel 2 is the voltage on the LX pin, DC coupled. Channel 3 in blue is the output voltage, AC coupled. We are using the TPS65265 in PSM mode and it is clear that the TPS65265 changes mode when this transient load takes place. It appears that the TPS65265 is not regulating the output voltage for some time after switching from PSM mode to CCM mode. Are there any known issues with this?
Thanks,
Tom Perman