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LM1949: electric motor brake

Juan Aparicio Jimenez
Intellectual 2200 points
Part Number: LM1949

My customer is evaluating using LM1949 (-55ºC)

The data from the control of the brake of an electric motor are:


Winding resistance: 3.2 Ohm 10%
Inductance: 1.6 Henry +/- 30%
Release current: I> 3.2 A kept during at least 150 msec
Holding current: 1.1 A <I <1.3 A


Are there any additional application notes or tools for calculations of this application?


They are also considering swapping the Darlington for a mosFET. Can you confirm if it is viable, and we you have an application sheet made with mosfet, or simulation already done?

Thanks and best regards, 

Juan.

  • +1
    TI__Guru 56650 points

    Juan,

    There is no any additional application notes or tools for calculations of this application except the datasheet.

    I don't think a mosFET can replace the darlington transistor to have a good current regulation because the mosFET is turned on by a voltage source. But, Darlington transistor is controlled by a current source.

    Regards,

    Wang Li