SLVUCE3 april 2023 TPS54KB20
3.4 Load Transient and Loop Response
Figure 3-9 and Figure 3-10 show the response to load transients for both designs. The current step is from 5 A to 15 A and the current step slew rate is 1 A/µs. An electronic load is used to provide a DC 5-A load and the load transient circuit on the EVM is used to provide a 10-A step. The VOUT voltage is measured using TP11 for U1 and TP29 for U2.
Figure 3-11 and Figure 3-12 show the loop characteristics for both designs. Gain and phase plots are shown for VIN voltage of 12 V and a 10-A load.
Figure 3-9 U1 Transient
Response
Figure 3-11 U1 Bode Plot –
10-A Load
Figure 3-10 U2 Transient Response
Figure 3-12 U2 Bode Plot – 10-A Load