On 6/15/17 3:51 AM, [email protected] wrote:
I have a TB6612FNG
<http://www.kynix.com/Parts/81922/TB6612FNG%2cC%2c8%2cEL.html>
motor driver module.
I am trying to control one DC motor (toy DC
motor) via Arduino. When I try to run this setup
using a 9V battery the motor runs as expected
(albeit really slow). But when I change the
power supply to a 9V DC 1A AC-DC adapter the
motor controller IC gets super hot. When I check
the current from the adapter to the circuit, it
shows 1.5A, and the voltage across the supply is
4.5 V. The motor runs for a second or two, then
it stops. I guess it is because the supplied
voltage dropped below the Arduinos operating
voltage.
So, my questions are:
Why does the IC become hot when powered by the
adapter? (I guess I burnt one chip already.
Shouldn't there be a thermal shutdown?)
Why does the voltage drop? I guess probably
because the adapter is unregulated, but I am not
sure. Do I need to get a different adapter? If
yes, what should be the specs? (When I bought
this adapter, I did not know about regulated vs.
unregulated. The Arduino website suggested 9V
1A, so I got that.)
How can I avoid overheating of the IC when
running with an adapter?
FYI: I am a hobbyist and a newbie in
electronics. Please feel free to suggest
alternatives and point out the mistakes. I need
to control 4 DC motors.
Thanks
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Are you feeding the controller a PWM signal?
Sounds like it is switched on by DC or the PWM
signal is misconfigured. Also check to make sure
you are not exceeding the voltage rating of the
motor.
If you have access to an oscilloscope you can
quickly check to see if the PWM output is working.
Or connect a LED with a current limit series
resistor to the Auduino's output and see if you
can vary the brightness. Disconnect the motor
controller first though.
Mark
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