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UCC25661EVM-128: Issue with the UCC25661x_Calc-3.3 Excel tool

Part Number: UCC25661EVM-128


Tool/software:

When I looking Gain curve (The Integrated Leakage mode is selected) there is one thing that I don't quite understand, the graphs don't intersect the (1,1) coordinate (arrow in figure below)?

Typically the gain is 1 in normalized resonant frequency and this is true when I select the Discrete Inductance mode, the graphs intersect the (1,1) coordinate. In a next figure the same is shown in Discrete Inductance mode.

Is it preferred to use Discrete Inductance mode in an Excel tool?

Figure 1. LLC resonant circuit design with integrated Leakage mode.

Figure 2. LLC resonant circuit design with Discrete Inductance mode.