The picture below shows that the current would increase to 1.96A while a motor was locked,īaseshield, which has to pluged on the Arduino to use The fuse would reduce its resistance while the motor was released. Then, the resettable fuse would increase its resistance to cut off the circuit, so that the driver chip was protected.

The current would increase immediately in this case. The resettable fuse was used to prevent the burning of chip while the motors were locked. Both of the capacitance and constant voltage are used to prevent device malfunction or breakdown caused by the current resulting from the inrush current at power ON or the negative current resulting from the back electromotive force at power OFF. And, the Baseboard (LV8406T) from Makeblock has a complete protection design which has capacitance, constant voltage chip, resettable fuse and heat sink. TB6612FNG from Sparkfun incorporate a protection circuit. In the aspect of security, L298N has 8 fly-wheel diodes to protect the chip while the back electromotive force which would burn the chip. Security, Operating Voltage, Operating Current, Heat Performance and the Volume of the Module. As a result, the rotate speed difference between two modules is 40-50RPM!Īs a conclusion, TB6612FNG and LV8406T are better than L298N in efficiency test.Ģ). For an instance, while the supply voltage is 9V, the data of L298N is,Īccording to the data, the voltage drop of L298N is 1.99V.Īnd the efficiency of L298N under 9V is I1 V/ (I2V1) = 59.24%, which was nothing like TB6612FNG and LV8406T (The efficiency of this two modules are 80%-90%, you can find the detailed data in appendix 1. The calculation formula of motor driver is: Pmotor driver=pmotor/ (pmotor driver+ Pmotor). Our motor’s nominal voltage is 6V, 155RPM±. In order to get the efficiency of the DC motor driver, we need to figure out the power of motors and the power of the whole circuit.

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