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UCC28070: Layout of circuit using current detection resistor

Kaji@PAN
Mastermind 7795 points
Part Number: UCC28070

Hi,

I previously obtained information on a circuit using a current-sense resistor in the thread below.
I am thinking about the layout of this circuit.
Is there any layout information that you can use as a reference?
I would like information on how to arrange the operational amplifier and the layout around the current detection resistor.

Best regards,

e2e.ti.com/.../899901

  • 0
    TI__Mastermind 34465 points

    Hello Kaji,

    The layout is important because you have a direct Ohmic connection between the high current signal and tjhe low level control network.
    The schematic I previously posted shows a differential amplifier sensor on the high current shunt resistor.
    There are two separate OPAMP packages and this allows placement directly close to the phase A and phase B legs.
    This will help with short and direct traces from the high current path to the measured amplifier output.
    There is a small capacitor filter on the OPAMP which filters out any switching noise pickup.
    Also there is an RC filter on the CSA,CSB input pins of the UCC28070.
    The capacitor for this filter should be located from CSA,CSB directly to GND pins.
    The traces from the OPAMP to CSA,CSB should be routed away from any high voltage switching nodes such as the drain node of the 
    boost FETs.

    Regards

    John