m15981 Posted November 9, 2006 Report Share Posted November 9, 2006 HiI am working on a project to drive a stepper with the use of a SLA7051M unipolar stepper driver.The typical circuit diagram suggested on the data sheet has a common supply for both the Vbb pin and the steppers. My problem is that the Vbb must be supplied with 10-44V and i have a stepper rated 3.15V. How can i connect those two together?Thank you Quote Link to comment Share on other sites More sharing options...
audioguru Posted November 10, 2006 Report Share Posted November 10, 2006 Your motor need s voltage that is much lower than the 10V minimum of the IC's load supply.Get a stepper motor that operates on the higher voltage or get another IC. Quote Link to comment Share on other sites More sharing options...
m15981 Posted November 10, 2006 Author Report Share Posted November 10, 2006 Isn't there a workaround to use those ICs? Do you know of any ICs operating in this voltage range because i have been searching all day long and all seem to work with 10V or more.Thank you Quote Link to comment Share on other sites More sharing options...
audioguru Posted November 10, 2006 Report Share Posted November 10, 2006 A lot of guys have posted their own discrete H-bridge circuits that operate down to 5V.I have never seen a stepper motor that uses less than 12V. Quote Link to comment Share on other sites More sharing options...
m15981 Posted November 10, 2006 Author Report Share Posted November 10, 2006 And i have never seen a stepper operating at 12V . :) If you check the following pdf you won't find even one stepper with a 12V rating, they are all below 10V.http://www.astrosyn.co.uk/docs/l-series-stepper.pdfIf i use a different supply for to the Vbb pin and the stepper will it work? Quote Link to comment Share on other sites More sharing options...
audioguru Posted November 10, 2006 Report Share Posted November 10, 2006 The stepper motor driver has a minimum operating voltage of 10V. It probably has problems on lower voltages.People re-use the stepper motors from disc drives and CD players because they are very high quality. Most operate from 12V like this one: Quote Link to comment Share on other sites More sharing options...
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