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WEBENCH design has an incomplete component ( Ohmite LVK20R027FER )

Ch Moe
Prodigy 10 points

I am in the process of implementing the designed power circuit into a PCB designer and noticed that one of the components is not rendering in the WEBENCH tool.  In the center of the image below, the chip resistor labeled Rsense shows up with a '+' sign instead of a circuit symbol.  Additionally, in the corresponding PDF design report image the circuit show nothing, not even the 'Rsense' label.  The component that is supposed to be there is the Ohmite LVK20R027FER which has 4 pads, while the image below seems to indicate there are only 2 connections.

I am bringing this up because I have never implemented such a complex power delivery system and am unfamiliar with this particular component.  I am guessing there are actually supposed to be 2 connections on top with the other pads grounded out?  From what I have read the chip resistor wouldn't function as intended if implemented as what the image below seems to show.

I am also curious why it is showing a separate simple circuit in the bottom left of the image.

I'm a Mechanical Engineer, not an Electrical Engineer.  I do know a little about circuits but I am far from a professional in power delivery circuitry.  Thanks for any help.

This image was taken from the WEBENCH site

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  • 0
    TI__Mastermind 41310 points

    Ch Moe,

    I agree that the picture of the schematic is incorrect, however, I believe that the device is still a resistor that would only have two terminals. There are additional connections for convenience of use, but the two connections are shorted at the device per its datasheet. From a simulation standpoint, it is still a two terminal device.

    We will investigate the issue with the schematic.

    Also, there are two Vouts with this schematic as it came from the Power Architect and it has two rails assigned at this voltage with two different output currents. The simplified way it is represented in the schematic is to have another output (in this case, Vout_2) with a different load. This is fairly common where many different outputs are being driven by the same circuit. The circuit produces the 7V needed with enough current for both the required outputs.