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TPSF12C3QEVM: TPSF12C3QEVM

Lucas Pucheta
Expert 5294 points

Part Number: TPSF12C3QEVM

Please advise how you derived the inductance value for the filter’s LCM1 and LCM2 of AEF. Thanks.

  • 0
    TI__Guru* 78987 points

    Hi Lucas,

    The values for Lcm1 and Lcm2 depend on the EMI noise source amplitude and the allowable Y-caps. If you have an existing passive filter design that passes, then the chokes are typically be 4-5 times lower in inductance (based on the amplification of the Y-rated inject cap by AEF).

    Regards,

    Tim

  • 0 in reply to Timothy Hegarty
    TI__Expert 5294 points

    Is there a possibility to get the relation between the EMI noise source amplitude and the allowable Y caps in an excel file or formulae?

    Do we have an orderable reference design part number for this board?

    Thanks.

    Project information (3):

    Project 3ph 460Vac input, 4.5kW, Iline = 7.7Arms max

    Project 3ph 230Vax input, 4.5kW,Iline = 15Arms max

    Project 1ph 230Vac input, 4.5kW,Iline = 25Arms max

  • 0 in reply to Lucas Pucheta
    TI__Guru 64291 points

    Hi Lucas. The responsible engineer is out of office now. The response will be delayed. 

  • 0
    TI__Expert 6245 points

    Hello Lucas, 

    The value of the Y caps is normally set by touch current limitation.  The formula is approximately Maximum Y capacitance = 10 nF * touch current spec.  60 Hz, 240 V input assumed.  Once you have a value for Y capacitance, this capacitance can be distributed between sense and injection capacitors.  With typical gain, about 30, 150 mV should be assumed for maximum allowed center node ripple with AEF on.  This sets the minimum Lcm2 value.  Use 30 x inject capacitance as the Y capacitance for this calculation. 

    The board shown is not yet orderable so we will have to send one to you manually.  Please email Sharadh Navale, and my self to request a board. 

    Regards, Robert