Loop Characteristic Evaluation and Optimization of TPS2583x-Q1
Loop Characteristic Evaluation and Optimization of TPS2583x-Q1
TPS2583x-Q1 is a high integrated USB Type-C and BC1.2 charging port controller that includes a synchronous DC/DC converter. With cable droop compensation, the VBUS voltage remains constant regardless of load current, ensuring connected portable devices are charged at optimal current and voltage. Because the output of USB Type-C and BC1.2 is based on the 5 V, the voltage feedback resistors are integrated in the IC; also due to voltage compensation circuit, it is difficult to test and evaluate the loop characteristics of the system. This application report is mainly about TPS2583x-Q1 Loop Characteristic Evaluation and Design. The test hardware in this application report is based on http://www.ti.com/tool/TPS25831Q1EVM-062.
1 Introduction
1.1 Loop Introduction of TPS2583x-Q1
TPS2583x-Q1 integrated a wide Vin buck DCDC to generate 5 V output. It is no different from the normal DCDC when it is without the cable compensation function (no Rsns, Rimon=0), as shown in Figure 1.
Figure 1. TPS2583x-Q1 System Without Cable Compensation Function When it uses the cable compensation function, as shown in Figure 2, it adds another current feedback loop.
Figure 2. TPS2583x-Q1 System With Cable Compensation Function