TPS40422: how to test loop stability by frequency domain analysis when tps40422 working at two-phase Mode

HI Kevin,

At 2phase mode, the part is using channel 1 loop only. The channel 2 loop is disabled.

So the bode plot of 2phase deisgn can be measured on channel 1.

Please refer to the attached user guide page 14 on how to measure bode plot on channel 1.

Thanks

Qian

slvu638.pdf

Hi Qian Chen,

Thanks ！

I get another problem.

these is no additional serial resistor(50ohm) in the feedback loop as the attached schematic.

Is there any alternative solution?

TPS40422 schematic.pdf