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TPS548D21: Part suggestion for Higher Current Requirement

Shifali N
Expert 2085 points
Part Number: TPS548D21
Other Parts Discussed in Thread: TPS546D24A, TPS546D24S, TPS543C20

Hi Team,

I am using TI regulator TPS548D21RVFT stacked for 80A current requirement in one of my design. But there is a change in current requirement  and I am looking for 100A regulator. Can you please suggest me a similar part to TPS548D21RVFT which can support 100A of current in single or dual phase.

Vin=12V/5V

Vout=0.85V

Iout=100A

  • 0
    TI__Mastermind 29640 points

    Hello , 

    Peter is looking into this with with our Catfish Family by doing 3PH design. He will provide more details on that 

    thanks 

    Tahar 

  • 0
    TI__Guru 50765 points

     

    The TPS548D21 is not intended to be stacked as it does not provide for current sharing between two paralleled device.  Were you using an external current sharing circuit to balance the currents of the two TPS548D21 devices?

    TI does not offer a 50A / phase integrated FET converter at this time.  For a 100-A load current you could consider:

    As mentioned, the TPS546D24A and TPS546D24S both support 40A / phase and can be stacked into a single output, 3-phase configuration supporting 0.85V.  The TPS546D24A and TPS546D24S both provide the same power-stage interfaces and 5mm x 7mm package as the TPS548D21.

    While the TPS546D24A and TPS546D24S both support PMBus, both also include extensive pin-programming options so that they can operating in a system without digital programming.

    There is an excel design tool available to assist with designing a 100A, 3-phase TPS546D24A or TPS546D24S design

  • 0 in reply to Peter James Miller
    Expert 2085 points

    Hi Peter,

    Thank you for your valuable response.

    Whether TPS546D24A can support 3x stackable with hardware-strap setting or whether we need to do any programming using PMBus.

  • 0 in reply to Shifali N
    TI__Guru 50765 points

     

    The TPS546D24A can support Vout = 0.85V and 3-phase configuration without PMBus programming.

    One device (Stack Controller) will use VSEL to program VOUT and MSEL1 to program switching frequency and compensation

    VSEL to AGND = 17.8kΩ programs 0.85V output 

    All three devices will use their MSEL2 pin to program the Stack Configuration

    Stack Controller (GOSNS connected to Ground at output)  MSEL 2 = 6.81kΩ to AGND

    Stack Followers (GOSNS pulled to BP1V5) MSEL2 = 10kΩ to AGND (Device 1 @ 120 degrees) and 21.5kΩ to AGND (Device 2 @ 240 degrees)

  • 0 in reply to Peter James Miller
    Expert 2085 points

    Hi Peter,

    Would you recommend us to use TPS543C20 or TPS546D24A for Vout = 0.85V and 3-phase configuration.

    Do you see any disadvantage in using one of these in a three phase configuration.

  • 0 in reply to Shifali N
    TI__Guru 50765 points

     

    Since the TPS543C20 only supports 2x stacking, I would recommend using the TPS546D24A for 3-phase stacking.

  • 0 in reply to Peter James Miller
    Expert 2085 points

    Hi James,

    Thank you for your prompt response.

    1. Can you please share the link for reference documents( EVK schematics, excel design tool etc) which will help us in designing TPS546D24A in 3x stack.

    2. The WEBENCH® Designer  of TPS546D24A can only be designed for 80A. Can we design for 120A in WEBENCH.

    Regards,

    Shifali N

  • +1 in reply to Shifali N
    TI__Guru 50765 points
    Shifali N said:
    1. Can you please share the link for reference documents( EVK schematics, excel design tool etc) which will help us in designing TPS546D24A in 3x stack.

    There are 2 excel design tools available in the TPS546D24A product folder - http://www.ti.com/product/tps546d24a under simulation and design tools.  Both support 3-phase design.

    Shifali N said:
    2. The WEBENCHRegistered Designer  of TPS546D24A can only be designed for 80A. Can we design for 120A in WEBENCH.

    Webench designer does not support 3-phase designs at this time, though aside from the MSEL2 resistor termination values, the design of the TPS546D24A is the same for a 40A 1-phase design, 80A 2-phase design, and 120A 3-phase design.