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TPS65987D: PP Switch close only if Synk PDO 2 is enabled

user4383332
Prodigy 60 points
Part Number: TPS65987D


Hi,
I'm considering to use the TPS65987D as part of my next design.

So far it looks like it have all the requirements. the only main question is the one specified above.

My design requires a voltage above 15V.
The first synk PDO is the 5V this is used in case of dead battery mode to turn on the PD controller.
It should negotiate the PDO#2 (Variable Synk 15V - 20V).

I also would like that the HV built in Mosfet closes only if this Second PDO is reached.

I have seen that I could use an external pair of mosfet with a proper gpio event configured  but i would prefer to use the one that are built in. (Space constraint)

Another question that I have is: does the device works without the EEPROM (Once programmed)?

  • 0
    TI__Mastermind 30000 points
    Hello,

    From your description, I do not see the need to close the internal switch only when a PDO of 15V or greater has been negotiated. If you implement an external SPI flash, the PD controller will first negotiate an implicit sink contract of 5V and then an explicit PD contract of 20V. You can use the internal power path for this.

    For your other question, yes the device can work without an EEPROM as their are default configurations built within the device you can utilize. If your system uses some type of EC, then you can push the patch bundle from the EC over the I2C lines.
  • 0 in reply to Adam Mc Gaffin
    Prodigy 60 points

    HI,
    thanks for your quick reply.

    "the PD controller will first negotiate an implicit sink contract of 5V and then an explicit PD contract of 20V. You can use the internal power path for this."


    As far I've understood it the PD also close the switch if the implicit sink contract of 5V is negotiated,  or not?
    Unfortunatly I don't have full control of what is after the PD controller (already designed board and project).

    I would understand the exact behaviour, to make the correct decision.

    I'll have to implement the SPI flash, for now I don't have an EC.

  • 0 in reply to user4383332
    TI__Mastermind 30000 points
    Yes, the PD controller would close the switch once an implicit contract of 5V has been negotiated.