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1751 Views 0 Replies Latest reply: Apr 23, 2014 3:04 PM by JohnDavis RSS
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Apr 23, 2014 3:04 PM

Switching Regulator for Motor

Offshoot from a question I had previously - What are your thoughts on providing power to a DC brushed motor via a switching regulator like the ones made by Linear Technology?  They can be selected to work with a wide input voltage (3.4V to 42V) and regulate down to 5V for a motor in a very small package (3mm x 4mm).  This would allow me to use a 5V motor. The servo that the motor is driving would be able to operate over my entire potential operating voltages (5-30V) instead of having versions specific of 5V, 12V, and 24V.  I think that one potential compromise of this solution would be that the amp draw would be higher than if it was nominally a higher voltage motor.  The power provided by the switching supply would run directly to MOSFETs that are controlled by a PWM signal from a MCU to vary the speed of the motor.

 

The whole point of doing this, if it would work, would be to be able to feed the servo a very wide input voltage, but the motor would always see 4.5V and perform the same regardless.  So far, I haven't been able to find anything specific online regarding driving motors with switching power supplies.

 

 

I'm thinking of this one: http://www.digikey.com/product-detail/en/LT8614EUDC%23PBF/LT8614EUDC%23PBF-ND/4488948

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