Other Parts Discussed in Thread: TPS2511, UCC28710, UCC28704
I have a power supply circuit (5V, 2.1A) and the power supply has a cable connected to it for the application. I am using the ucc28700 for the power supply circuit and I have a TPS2511 on the secondary circuit for "usb" power control. At the output of the TPS2511 I am getting a good constant regulation around 5V from 0A(no load) to 2.1A (full load); however, when I test the output at the cable end the voltage drops down to 4.75V @ 1A and 4.6V at 2.1A . I believe this has to do with the cable not being compensated on the TPS2511. The cable compensation pin on the UCC28700 is shorted to ground for the max cable compensation. Looking at the data sheet for the TPS2511 the ~CS pin is used for cable compensation for the TPS2511. The schematic shown uses a FB pin coming from the main power supply. How can I achieve cable compensation for the TPS2511 using the UCC28700 since there is no FB? Any advice would be appreciated.
Thanks.