TIDT292 June 2022
2.5 Bode Plots
Figure 2-7 shows the bode plot of the converter, when supplied at 115 VAC, 400 Hz, while loaded at 5 A and 13 A. To measure the stability of the DC/DC stage, a 50-Ω resistor was inserted in series to the common connection of R17 and R48 to the net “30V”.
Figure 2-7 Bode Plot at 5 A and 13 A Load CurrentTable 2-8 Crossover Frequency, Phase
Margin and Gain Margin
| Parameter | IOUT = 5A | IOUT = 13 A |
|---|---|---|
| Crossover frequency | 3.186 kHz | 2.892 kHz |
| Phase margin | 57.56 degrees | 58.76 degrees |
| Gain margin | 11.67 dB | 11.99 dB |