ADuM3221 to drive a brushed motor

stoccarda on Apr 21, 2016

I would like to use a ADuM3221A to drive a brushed DC motor.
Input voltage levels are 5V. Idea is to directly connect the DC motor with a limiting 12 R resistor to the output pins VoA and VoB.

VDD2 is 8V, motor current around 0.8A.

Depending on the input levels, it should be possible to drive the motor bidirectional.

Will it be possible or any concernds?

A TC4426 and opto-coupler were used in a former design

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0 RSchnell

on Mar 1, 2017 11:50 PM
For the second part of my answer, I did mean A4953, sorry for the confusion.

The output voltages would be the supply voltage for the ADuM3220, but since this would be an output, a simple voltage divider would suffice to get the voltages in range for the A4953

The ADuM120N also has an abs max of 7 V on the supply rail, so you would need to run the ADuM120N on a lower voltage supply than 9 V, preferably around 3.3 V or 5 V.
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0 RSchnell

on Mar 1, 2017 11:50 PM
For the second part of my answer, I did mean A4953, sorry for the confusion.

The output voltages would be the supply voltage for the ADuM3220, but since this would be an output, a simple voltage divider would suffice to get the voltages in range for the A4953

The ADuM120N also has an abs max of 7 V on the supply rail, so you would need to run the ADuM120N on a lower voltage supply than 9 V, preferably around 3.3 V or 5 V.
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