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TPS92200: Where is the equation X on page 18 of TPS92200 datasheet?

Kazuya Nakai59
Guru 21505 points
Part Number: TPS92200

 Hello guys,

 One of my customers is considering using TPS92200D1 for their new products.

 They have several questions about TPS92200 datasheet (SLVSER4) and EVM manual (SLUUBZ9) as the follows. Could you please give me your reply?

 Q1. Where is the equation X described in section 8.2.1.2.2. on page 18 of TPS92200 datasheet?

 Q2. What are delta V and delta I described in equation 6 of section 8.2.1.2.3 on page 19?

 Q3. What is purpose of R4 in Figure 11 on page 11 of EVM manual?

       Is it for a high frequency RC composed R4 and capacitor of FB termianl?

       Is R4 (1k ohm) mondatory part?

 Your reply would be much appreciated.

 Best regards,

 Kazuya.

  • 0
    TI__Mastermind 22745 points

    Hi kazuya,

       1.  yes, we have missed an equation in datasheet, we will updat eit later. Almost you cna just use the 10uF capacitor.

       2. delta V and delta I depend son the V-I characteries of the LED that you have chosen. here is an Aplllication not taht can help you understand this:

       3. R4 was keeped to another RC filter for FB pin when output capacitor was connected beteern LED string instaed of connectedting betwwen output and ground. For normal application, you don't need to consider the R4, you can also remove this part.

    BR

    Sean

  • 0
    TI__Mastermind 22745 points

    Hi Kazuya,

         here is the application note:

    BR

    Sean

  • 0 in reply to Sean Zhou
    Guru 21505 points

     Hi Sean,

     Thank you very much for your reply and I'm sorry to be late may response.

     Your reply and the application note are very helpful!

     Thank you again and best regards,

     Kazuya.