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tps40140 high transient and low phase margin

Other Parts Discussed in Thread: TPS40140

hi,

In the Bode plot is the phase and the gain poorly and even with load changes the output voltage break through  (see Annex).

L22, and the capacitances C11, C12, C13 and C10 are currently not implemented because only 8A is required, VDDC = 1V

As an alternative compensation network I have the values Cth = 180 pF selected, Rth = 47,5kOhm and Cthp = 12pF. Thus, the transient load are better, but the undershout/ overshoot peak are still too large.

I would here need help in the dimensioning of the compensation network.

could you please help?

thank you

kamaltps40140 sch.docxTPS40140_Messungen.pdf