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TPS-40170 20V/20A

Akshay Bathe1
Prodigy 85 points
Other Parts Discussed in Thread: TPS40170

Hello,

          I am trying to design a 20V 20A power supply. Can i use TPS40170? If yes how should i use it? 

 

  • 0
    TI__Mastermind 35185 points

    Hi Akshay,

    I recommend looking at PMP6703 then following the design/layout very closely with necessary adjustments in the ratings of the output capacitors and the compensation. The equations in the datasheet can be used to choose the values for the inductor and output capacitors. The compensation excel spreadsheet also located in the product folder can be used to tune the compensation. The circuit with U100 probably is not needed for your application and can be removed. This adds an external pulse skip mode which is enabled and disabled with the skip/enable jumper.

    Best Regards,
    Anthony

  • 0 in reply to Anthony F
    Prodigy 85 points

         Hi anthony,     

         After reading the datasheet i found few problems as mentioned below.Please try to solve

                   1. What is Voltage tracking?Can i use on FB pin without using Vtrk?

                   2. As my Vin < 2*Vout i need to use equation no.22 (page 32) but what is I-tran in that equation specified in the datasheet of TPS40170 datasheet. 

                   3. Also can i use two tps40170 in synchronous using sync pin? Please explain the difference between 0deg & 180deg mode of synchonization. 

      Thanks for your reply.

  • 0 in reply to Akshay Bathe1
    TI__Guru**** 191445 points

    1.  Normally, the fed back output voltage is compared to the fixed internal reference and provides a fixed dc output voltage.  In some applications you may wnat the output voltage to "track" some other voltage.  In this case you can apply that voltage to the TRK pin.  The internal error amp will use the lower of Vtrk or the internal reference.  TRK is not an alternative to FB.

    2. Itran is the transient current load step.  that is something you provide.  It is the maximum load step change you would expect to see in your application.

    3. if you need two different output voltages, you can synchronize two TPS40170 converters to operate at the same switching frequency.  TPS40170 is not intended for "parallel" operation to get 2 X output current by tying two supplies together.  They can either be in phase (0 degree) or out of phase (180 degree).  Out of phase operation may allow the input voltage ripple to be lessened.