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TPS25751: PDO selection

Part Number: TPS25751


Tool/software:

Hi,

My customer is evaluating TPS25751D as Sink.  They set "Transmit Sink Capabilities (0x33)" as follows on TPS25751.

  •   Sink PDO1: Voltage=5.00 V, Current=1.50 A
  •   Sink PDO2: Voltage=5.00 V, Current=3.00 A
  •   Sink PDO3: Voltage=9.00 V, Current=2.00 A
  •   Sink PDO4: Voltage=9.00 V, Current=2.22 A
  •   Sink PDO5: Voltage=9.00 V, Current=2.77 A
  •   Sink PDO6: Voltage=15.00 V, Current=1.80 A
  •   Sink PDO7: Voltage=15.00 V, Current=2.00 A

 Then, they connect TPS25751D with 45W AC Adaptor which has the following setting.

  •   Source PDO0: Index=0, Type=0, Voltage=5.00 V, Current=3.00 A
  •   Source PDO1: Index=1, Type=0, Voltage=9.00 V, Current=3.00 A
  •   Source PDO2: Index=2, Type=0, Voltage=15.00 V, Current=3.00 A
  •   Source PDO3: Index=3, Type=0, Voltage=20.00 V, Current=2.25 A

As the result, TPS25751D selects "Source PDO1 Voltage=9V"/"Sink PDO5 Voltage=9V" on red line

Could you please let us know the algorithm to select PDO?  They want TPS25751D to select Source PDO2/Sink PDO6 (Voltage=15V).  Please let us know.

Thanks and best regards,
M.Hattori