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SMPS rating calculation help

Discussion in 'Datasheets, Manuals and Component Identification' started by anroop, Feb 27, 2014.

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  1. anroop


    Dec 11, 2013
    I have formulated a circuit. it uses 6 stepper motors (12v, 1.1A each) and IC with 5v input. but only two motors run simultaneously. what rating of SMPS should I go?

    1) 12v with 2A
    2) 12v with 3A
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Obviously 2 motors will require 2*1.1A=2.2A which is more than the 12V/2A supply can deliver.
    So 12V/3A is the power supply of your choice plus it leaves some headroom for current spikes.
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