Other Parts Discussed in Thread: TPS25750
In our design we are using using TPS25750D USB Type C controller and Power ing through a 12V DC adapter with USB C type D Conn.
In datasheet of TPS25750D , it is mentioned that VBUS pin 32 and Pin 33 are output type Pin and are 5-V output from PP5V input to LDO. Bypass with capacitance CVBUS to GND.
But in reference design mentioned in EVM board of TPS25750, They are shorting the VBUS pins 32 and 33 with VBUS_IN Pin which is connected to a 12V input supply from USB C conn.
As per our understanding if we have 5V DC input at USB C connector we can connect it to PP5V pin and that case can short VBUS pin pin to VBUS_IN . But in case we have 12V upply input at USB C con we shouldn't connect 12V supply connected to VBUS_IN pin to 5V output VBUS Pin.
So want to confirm if it is ok to short VBUS pin with VBUS_IN pin , in case we have 12V input supply to USB C conn and there is no supply input at PP5V pin ( PP5V pin is connected to GND through 10uF cap) .
And what is purpose behind shorting the VBUS pin to VBUS_IN pin in EVM board ref design.
Please help here.