Other Parts Discussed in Thread: TEST
Tool/software: WEBENCH® Design Tools
Figure 1 is the circuit schematic diagram of 24V input and 5V output designed by weBench Power Designer using TPSM53603 chip. Figure 2 Is the schematic diagram designed by SNVU627B document. I bought components and welded them to the PCB board, and measured the output voltage 5V after adding 24V voltage to the input end.When I added a resistance of 2.2 ohms and 200 watts to the output, the voltage dropped from 5V to 4.66V.Figure 3 is the photo of another test power supply I fixed at 5V output and connected to this resistor. It can be seen from the photo that this resistor flows through 2.3A.FIG. 4 shows that I fixed the test power supply as constant current output 2.18A, because the output current was not enough, the power supply dropped from 5V to 4.5.This situation is the same as that of TPSM53603, indicating that TPSM53603 does not output 3A current at all, that is, it outputs about 2.2a current. It is said in the manual that TPSM53603 can output 3A current. I would like to ask why there is no output even of 2.5a.Using the above load resistance can output 2.3A, the output voltage will not drop.