Hello,Teams
Now we are considering the schematic for TPS54425.
Would you please help us?
Our request is makeing circuit with bellow situation.
Vin 12V
Vout 5V
Iout 1.1A
L 2.2uH
As you know WEBENCH answered me with recommended circuit.
But WEBENCH does not support Board plot now.
And I found description about phase margine information in datasheet.
But I'm not sure what requested phase margine curve.
The descrition is bellow. bellow is TPS54425 datasheet information.
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The low frequency phase is 180 degrees. At the output filter pole frequency, the gain rolls off at a -40 dB per decade rate and the phase drops rapidly.
D-CAP2 introduces a high frequency zero that reduces the gain roll off to -20 dB per decade and increases the phase to 90 degrees one decade above the zero frequency.
The inductor and capacitor selected for the output filter must be selected so that the double pole of Equation 4 is
located below the high frequency zero but close enough that the phase boost provided be the high frequency zero provides adequate phase margin for a stable circuit.
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So I'm not sure whether sutisfy phase margin of webench TPS54425's design in AC transfer characteristics result of TINA TI.
Would you please check attached file design?
Best regards,
akashi
