Other Parts Discussed in Thread: TINA-TI
Hello,
I am currently trying to design a step-down dc-dc converter with TPS54519.
The fact is that after reviewing the datasheet I am not able to design the compensation network.
I have seen a picture (Figure 28) in the datasheet that shows the open loop bode plot including both Filter output response and Modulator Gain.
The datasheet recommends using TINA-TI model TPS54519 to do so, but the model (SLVMBS8.TSC, TPS54519 TINA-TI Average Reference Design) shows the close loop response because a compensation network is required to be included in the circuit.
From my understanding and as far as I know and after confirming it in slva301.pdf document (see attached capture example for TPS40200D dirver), I need output filter plus modulator gain to get the bode plot diagram and design the compensator network from this diagram. The Output Filter (RLC) does not show the gain because is 1 (0dB) at low frequencies, obviously. (see attached RLC bode diagram example, slva301.pdf).
So, how can I get this (output filter plus modulator gain) bode plot diagram of the datashet example (Figure 28)? What is the Modulator Gain of this TPS54519 driver?
Regards,
