4A H-bridge motor driver using the L298 IC Schematic

Posted on Feb 6, 2014

This is an implementation of the L298 to drive motors and inductive loads up to 4A continuously. Initially the L298 contains two separate channels, each one capable of driving 2A loads. Connecting them in parallel as in the schematic makes a single 4A driver. The two transistors Q1 and Q2 act as an OR gate enabling the L298 if any of the two signa

4A H-bridge motor driver using the L298 IC Schematic
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ls W1 or W2 are high. If both W1 and W2 are low (logic 0), the driver is disabled and provides a high impedance on its output, causing an eventually connected motor to move freely with its inertia. C1 and C2 are 10 nF decoupling capacitors. D1 to D4 are flyback diodes. Their forward current should correspond with the the expected load. The two leads of the motor are directly connected to J1. The circuit can be powered with 9V to 35V Here figure 1, is an implementation of this circuit on a PCB. This an actual picture of the motor drivers we used in the ROBOCON 2007 competition. Notice how the heat sink is firmly attached to the driver. This protects the IC from eventually burning-up from stall currents.

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