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TPS544C25: Consideration for control mode selection in SWIFT

Yi Dou
Intellectual 545 points
Part Number: TPS544C25
Other Parts Discussed in Thread: TPS56221, TPS546D24A

Hi E2E,

I'm just looking at PoL DC/DC with "SWIFT" band, would like to know what I'm supposed to consider when looking at different control mode for each device.

For example:

1. "VM" voltage mode only exists, combined with PMBus devices.

2. "CM" and "ACM" current mode only exist in non-PMBUS devices.

What are the special reasons here? Does PMBUS have special request for control mode?

  • 0
    Intellectual 545 points

    Hi TI,

    Any response for this question?

  • 0 in reply to Yi Dou
    TI__Genius 16720 points

    The table above is incomplete. TI has more than 1000 dc/dc converters. 

    www.ti.com/.../products.html

    The TPS56221 is voltage mode and not PMBus.

    The TPS546D24A is average current mode and PMBus. 

     The type of control mode and PMBus are not correlated.  

    Generally, the VM and CM are externally compensated and the ACM and DCAP3 are internally compensated.

    The VM and CM are fixed switching frequency and have sync pin.  The DCAP3 is a pseudo fixed frequency but has fast transient response. 

    Focus on the problem you are attempting to solve and many of the solutions will filter out.  

  • 0 in reply to David_Daniels
    Intellectual 545 points

    This is where I find the concept of "SWIFT", looks like SWIFT belongs to buck DC/DC definitely, targeting at high-performance conversion for high-current, space-constrained applications, as point-of-load buck converter powering ASIC/FPGA mainly. So it doesn't matter with control mode in this kind of application, right? Only remote sense is typically needed.

    Also, it is very confusing that the relationship of "SWFIT" and "TI-Buck Switching Reg-Medium Voltage". Can you let me know which belongs to another?

  • 0 in reply to Yi Dou
    TI__Genius 16720 points

           

    Here is some information on the different control modes to assess the pros and cons

        training.ti.com/.../slyt710.pdf                 

     

         training.ti.com/survey-control-modes-step-down-converters-and-controllers                       

                               

  • 0 in reply to David_Daniels
    Intellectual 545 points

    Nice things to see, appreciate it for your kind answer. However do you have any comments for below questions if possible?

    It is very confusing that the relationship of "SWFIT" and "Buck Switching Reg-Medium Voltage". Can you let me know which belongs to another?

    Does "SWIFT" mean all buck integrated-switch(converter in TI's definition) DC/DC in TI?

  • 0 in reply to Yi Dou
    TI__Genius 16720 points

    SWIFT is a brand.   Switchers With  Integrated Fet Technology.       

    Prior to using converters,  hardware developers often used dc/dc controlllers with  external fets. 

    SWIFT is a way for customers to identify a power solution that is quick and easier

    to develop with because the integration and support with design tools such as Webench.

    Nowadays, most of new products are converters and nearly all converters have webench and simulation tools support. 

     

    Buck Switching Reg-Medium Voltage is a product line internal to TI that specializes in medium voltage (ie 12V).