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TPS25740: What is the input to the controller?

John Khan32
Prodigy 45 points
Part Number: TPS25740

Hi,

Its my first time designing something using USB and I'm working on making a USB C power adapter.

I'm trying to understand the PMP20533 reference design.

I'm not quite sure I understand how the circuit works. How much voltage is the power supply side of the circuit providing to the TPS25740 controller? In other words, what is the input to the VPWR pin on the TPS25740? Is it 15V/3A because the output of the entire circuit is "5V,9V,15V 3A".

Secondly, how does the TPS25740 set the output to the USB C port? How does it reduce the voltage from lets say 15V to whats required at the port of lets say 5V?

Lastly, is there a TINA TI simulation model for TPS25740? 

I would really appreciate if you could help me out with these misconceptions.

Thanks

  • 0
    TI__Intellectual 1890 points
    Hi John,

    The input voltage on the TPS25740 VPWR pin can be from 4.65 to 25 V. It is powered by whatever voltage is negotiated for Vbus so it could be 5V, 9V, or 15V. The TPS2570 will not draw much current (3 mA max with a current sink attached), reference page 8 in the datasheet to see the supply current drawn by VPWR.

    The TPS25740 sets the output of the USB C port by changing the feedback network of the Flyback controller using the CTL1 and CTL2 pins. Page 38-41 in the datasheet goes into detail on the CTL1 and CTL2 pin implementation with a power supply feedback network. Page 44 also shows a similar schematic for more reference. Basically, CTL1 and CTL2 change the feedback network by switching in different resistances and thus change the power supplies output voltage to the desired 5V, 9V, or 15V.

    I do not believe there is a TINA TI simulation model, but there is a PSpice transient model available.

    Please let us know if you have any other questions.

    Regards,
    Donovan