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TPS54519: TPS54519 MODULATOR GAIN (COMPENSATION NETWORK DESIGN)

Part Number: TPS54519
Other Parts Discussed in Thread: TINA-TI, TPS62869

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 driver), I need output filter plus modulator gain to get the bode plot diagram and design the compensator network from this diagram. 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 datasheet example (Figure 28)? What is the Modulator Gain of this TPS54519 driver?

Regards,