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TPS65987D: Source ternimal DC/DC adjust method by using CRC and PWM

Vincent Li00
Intellectual 2035 points
Part Number: TPS65987D
Other Parts Discussed in Thread: TPS65987S,

Hi Guys

Our customer want us our TPS65987S as Type-C PD source terminal. We have reviewed our TI EVM solution. But we found the DC/DC circuit in the note of TPS65987-90EVM. You can see below, there are three mosfets at this design. It is so expensive. As you know, we can use PWM and RC circuit application at DC/DC FB pin to realize the output adjust. 

Do you have any design file or reference design by using below solution. This solution will be low cost. But how to configure our TPS65987S device and how to calculate the R3, R4 and C?

Your feedback will be appreciated.

Thanks

-Pengfei

  • 0
    TI__Mastermind 36756 points

    Hi Pengfei,

    We do not support the architecture you highlighted below. The recommended approach is to use the feedback network from the reference design. You could use an I2C controlled Buck Converter if that helps to reduce the cost.

    If this answers your question, PLEASE select This resolved my issue

    Thank you,
    Eric

  • 0 in reply to Eric Beljaars
    TI__Intellectual 2035 points
    Hi Eric
    We can't use GPIO14/GPIO15(PWM) to realize the method I mentioned, Right? But I also search our Buck IC with I2C adjust output. All devices can not support 40V input range. I still want to know, if we just use our TPS65987D recommended approach feedback network. That mean we have to add additional three mos. The cost will have no any advantage. So do we have any other solution to realize output adjust without ICs, just with some resistor or capacitors. Some local competitors have the solution I mentioned. So I assume that we can also use our GPIO14 to do that. Only without so many mosfet, we can have opportunity to design in our device. Why not do that by GPIO14?

    Thanks
    -Pengfei
  • 0 in reply to Vincent Li00
    TI__Mastermind 36756 points
    Hi Pengfei,

    You can refer to the TPS65988EVM power architechture or TIDA-01627 power architechture. These are both supported by TPS65987D.

    Thank you,
    Eric