Hello,
I made a DC / DC converter using the TPS54560.
Please find attached schematic. It is made with the help of TI Webench designer (webench_design_2411034_14_631442162.pdf).
The components used are exactly thats suggested.
The circuit is not working because the output voltage follows the input voltage.
In particular, under no load condition, I measured:
Vin = 8V – Vout = 7,9V
VFB = 1,7V, VRT/CLK = 0.497V, VCOMP = 2,016V
I don’t have Vout = 3,8V
The output signal (pin 8 of the TPS54560), displayed with oscilloscope, is shown in the two attached figures.
I tried to load the output with two different current values (140 mA and 1.2 A) and I just got a lowering of the Vout, but not the expected 3.8 V.
Do you have any suggestions to give me?
Thank you in advance for your help.
Best regards.
Mariano
