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Buck regulator With VID Controller

KLN
Intellectual 320 points
Other Parts Discussed in Thread: LM21215, LM10011, TPS548D22, TPS543C20A, TPS546C23, TPS546D24A, TPS546C20A

Hi Team,

We are designing a NXP QorIQ T2080 Processor based board which needs a variable Core Supply (0.9V to 1.1V).
We are looking for a Switching Buck regulator with the below requirements
  1. Input Voltage: 12V
  2. Output voltage: 0.9V to 1.1V
  3. Output current: 30A to 40A
  4. VID Bits: 5 or 6 
Please suggest the part for the above requirements (Regulator with VID)
 
And in our previous DSP-TMS320 series design, we designed the smart reflex supply (Variable Core Voltage)
By using separate BUCK regulator and VID controller externally
Regulator part: LM21215 (5.5 VIN, 15A)
VID Controller: LM10011  (4bits)
Or suggest the part with a separate regulator part and VID separately with the above requirements.
Please note this is an immediate requirement
  • 0
    TI__Mastermind 32400 points

    Hello, 

    can you please if any of these will fit your requirements? These are our high current converters:   

    TPS546D24A 

    TPS543C20A

    TPS549D22 

    TPS548D21

    TPS548D22 -

    Thanks

    Tahar

  • 0 in reply to Tahar Allag
    Intellectual 320 points

    Hi

    We are looking with VID Controller with VID Pins, Not using PMBUS.

    We don't want to use PMBUS/I2C for 

    1. Output voltage: 0.9V to 1.1V
  • 0
    TI__Guru 56985 points

     

    For a 30-40A load current with parallel VID, I would recommend selecting the TPS548D22 or TPS543C20A with the LM10011.

    The TPS548D22 is a D-CAP3Tm Constant On-time Control converter with integrated 40A MOSFET power stage, remote sense and selectable reference voltage.

    The TPS543C20A is an Advanced Current Mode Control converter with integrated 20A MOSFET power stage, remote sense and selectable reference voltage.  The TPS543C20A is also stackable, allowing two devices to operate in parallel and out-of-phase if additional loading current is needed.

    If a digital interface is desirable, the TPS546C23 could also be considered. 

    If Digital VID via PMBus (two-wire serial bus) is desirable, the TPS546D24A would be another option, eliminating the need for the LM100011.

     By selecting a 3.32kΩ VOUT to RSP resistor, the full 6-bit VID scale of the LM10011 can be used over the 200mV range (3.1mV/LSB) for maximum resolution of the VID system.

    The TPS548D22, TPS543C20A, and TPS546D24A can all be pin-programmed to start with an internal reference voltage of 1.1V, eliminating the need for an external divider and maximizing the output voltage regulation accuracy.

  • 0 in reply to KLN
    TI__Guru 56985 points

     

    My apologies for referencing PMBus (Serial Interface) after you had responded to Tahar, I was typing my response and did not see your reply before I sent it.

    The TPS548D22 and TPS543C20A do not have a serial interface,

    The TPS546C23 has a PMBus serial interface, but can be used with the LM10011 VID controller for parallel VID control with or without the PMBus interface.

  • 0 in reply to Peter James Miller
    Intellectual 320 points

    Hi 

    Thanks for your quick response.

    Are there any reference design of TPS548D22 / TPS543C20A with LM10011 

    TPS546C23 PMBUS can be left open and used with LMM1001. Is my understanding correct?

     

    Peter James Miller said:
    By selecting a 3.32kΩ VOUT to RSP resistor, the full 6-bit VID scale of the LM10011 can be used over the 200mV range (3.1mV/LSB) for maximum resolution of the VID system.

    I didn't understand this..

    Peter James Miller said:
    The TPS548D22, TPS543C20A, and TPS546D24A can all be pin-programmed to start with an internal reference voltage of 1.1V, eliminating the need for an external divider and maximizing the output voltage regulation accuracy.

    Can you be more clearer on this? An explanation on how this?

    One more query, Aren't there any regulator with integrated VID controller?

  • 0 in reply to KLN
    TI__Guru 56985 points
    KLN said:
    Are there any reference design of TPS548D22 / TPS543C20A with LM10011 

    Not that I am aware of, but the combination would be straight forward.  You can use WeBench to design either for a 1.1V output, select the VSEL resistor programming for the 1.1V reference voltage and a VOUT to RSP resistor of 3.32kΩ, then connect the output of the LM10011 to the RSP pin.

    The EVMs for either the TPS548D22 or TPS543C20A could be easily modified to match the required circuit by changing a couple of resistors.

    KLN said:
    TPS546C23 PMBUS can be left open and used with LMM1001. Is my understanding correct?

    Yes, that is correct.  The TPS546C23 will power-up with a 0.6V reference voltage and operates without PMBus.  The PMBus CLK and DATA pins can be shorted to ground if not used.  If not using the PMBus, the TPS546C20A could also be selected.  The TPS546C20A allows reference voltage selection via pin programming, which would allow you to select a 1.1V reference voltage to eliminate the FB to GND resistor and improve total regulation accuracy.  It is otherwise identical to the TPS546C23.

  • 0 in reply to Peter James Miller
    Intellectual 320 points

    Thanks.

    One more query on LM10011, As you said it can be operated in 6-bit VID mode, but only 4-VID pins are available.

    That meaning with 6-bit VID mode(tied to GND), 4 VID pin will give accuracy of voltage of 6-bit, Is my understanding correct?

  • 0 in reply to KLN
    TI__Guru 56985 points

     

    Please review the description the VIDS pin.  In 6-bit mode, the VIDS pin selects whether VIDA, VIDB, and VIDC represent the lower 3-bits or upper 3-bits of the 6-bit VID code, allowing the 4 pins to input a 6-bit VID.  This may require an external 3-channel 2:1 Mux to transition between 6-bit parallel and 2x3 bit selection.

    https://www.ti.com/logic-voltage-translation/specialty-logic-ics/digital-multiplexers-encoders/products.html#p404=Digital%20Multiplexer&p480=3;4