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Question on TPS54310 switching frequency (used in EVM6437)

Anonymous
Anonymous
Other Parts Discussed in Thread: TPS54310

Hello,

 

I would like to ask one question about TPS54310 switching frequency for EVM6437.

 

According to page 4 of SLVA109, Designing With the TPS54310 Synchronous Buck Regulator, when SYNC pin is left open and R1 pin is connected through a resistor to ground, then the switching frequency can be approximately obtained from Fig. 2

              

          

My question is why a switching frequency is needed? Is the DSP a DC or AC device? If it is a DC device, and from the Fig 2 we see that when resistor is 71.5K, the switching frequency is somewhere between 700 and 750 KHz. What is such a high switching frequency used for?

 

I also have questions on the name of TPS54310. What does

1.      Synchronous-buck

2.      PWM (what’s the relationship between a switcher and pulse-width modulator?)

3.      Integrated FETs

mean, respectively?

 

 

 

Thanks,

Zheng

  • 0
    TI__Guru 64470 points

    There is a bunch of information available on the web regarding SMPS (Switching Mode Power Supply) topologies and technology.

    Search Google for "SMPS" and you will obtain a bunch of articles explaining this technology.  The Wikipedia article is a good foundation.

    http://en.wikipedia.org/wiki/Switched-mode_power_supply

     

    Zheng Zhao said:

    My question is why a switching frequency is needed? Is the DSP a DC or AC device? If it is a DC device, and from the Fig 2 we see that when resistor is 71.5K, the switching frequency is somewhere between 700 and 750 KHz. What is such a high switching frequency used for?

    The switching frequency is associated with the buck converter switching power supply technology and is not directly related to the DSP.

    To you specific question, the DSP requires a DC voltage.

     

    I also have questions on the name of TPS54310. What does

    1.      Synchronous-buck

    2.      PWM (what’s the relationship between a switcher and pulse-width modulator?)

    3.      Integrated FETs

    mean, respectively?

    [/quote]

    Understanding the topology of a buck converter SMPS will help you understand what these terms are.  Again, the above Wikipedia article will help provide a framework for the above terms.

    [quote user="Zheng Zhao"]

  • Anonymous
    0 Anonymous in reply to BrandonAzbell

    Dear Brandon,

    Thanks very much, I will study this.

     

    Zheng