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TPS25946: Circuit design problem

Rhea Gao
Expert 2310 points
Part Number: TPS25946

Hi,

I have a customer using TPS25946, there are some problems, please help to support!

Required functions: Type-C uses 24Pin model: CX90B2_24P, VBUS isolation protection circuit design is as follows (chip TPS25946) : (No charging requirement, power consumption is about 6.5W)

1.Please check the circuit design. Could you help to optimize the circuit due to the tight PCB layout?

2. The circuit design has the following problems, please help to confirm:

1) What is the appropriate dvdt pin voltage climb rate setting?

2) How much is appropriate to set the blanking time of the ITIMER pin, or how much is appropriate to select the tolerance value?

3) Can PG and PGTH pins be suspended directly?

4) What is the capacity value of Cout selection? What is the appropriate package (IINRUSH=Cout*dvdt, whether Cout can not be too large, for 5V*1.3A=6.5W machine power consumption, how to choose Cout)?

5) Is the D1 of Vout recommended in the manual not needed in scenarios such as industrial cameras?

Many thanks~
  • 0
    TI__Guru 62835 points

    Hi Rhea,

    Thanks for reaching out. Please see my response inline.

    1.Please check the circuit design. Could you help to optimize the circuit due to the tight PCB layout? They can keep ITIMER and SS pin open. 

    2. The circuit design has the following problems, please help to confirm:

    1) What is the appropriate dvdt pin voltage climb rate setting? It depends on customer requirement. They can use dvdt open also if output cap is not very high. 

    2) How much is appropriate to set the blanking time of the ITIMER pin, or how much is appropriate to select the tolerance value? It is upto customer. They can leave open to have zero blanking time theoretically. 

    3) Can PG and PGTH pins be suspended directly? You mean left open? Yes they can be left open. 

    4) What is the capacity value of Cout selection? What is the appropriate package (IINRUSH=Cout*dvdt, whether Cout can not be too large, for 5V*1.3A=6.5W machine power consumption, how to choose Cout)? COUT depends on application. You can use design calculator on web page and input your requirement and check if calculator passes the design. You can refer EVM design on product page. 

    5) Is the D1 of Vout recommended in the manual not needed in scenarios such as industrial cameras. You can skip D1.

    Regards

    Kunal Goel