Customer tested the bode plot of TPS562209, and the phase margin is too low.
[Conditions] (injection resistor=50 ohm, injection voltage =400mv)
-Vin=12V Vout=5V
The initial schematic is as below, with the R60 removed, R61 changed to 10K ohm, R63 to 56K ohm, which is closed to the suggested value provided in Table 2 of the datasheet.
The bode plot results are as below. The 2 different results were obtained with the same bom, and just measured at different time. The phase margin is about 10 deg, which can not meet their requirement. I also checked the EVM guide, and found a feedforward capacitor (C9) is suggested for higher output voltage. So will this be the key reason? Did you test the plot result with this output voltage? Any suggestion for this issue? Thank you.
