Part Number: TPS715
Hello,
I'm using the TPS71501 for generating 3.9V out of 5V. The devider resistors are R1=2.2 Meg and R1=1 Meg.
The output voltage is quite ok, but on the FB pin I can measure a repeating voltage ripple, see scope plot.
The high frequency is approx. 27 kHz, the repeating frequency is 3.1 kHz.
Is this voltage ripple normal? What might be the reason for this?
Thank you for any suggestions!
Jonas