Motor driver ics

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You are now subscribed to - Motor Driver ICs You can re-use the validation code to subscribe to another product or application. Motor Driver ICs are primarily used in autonomous robotics only. Also most microprocessors operate at low voltages and require a small amount of current to operate while the motors require a relatively higher voltages and current. Thus current cannot be supplied to the motors from the microprocessor.

This is the primary need for the motor driver IC. The LD IC receives signals from the microprocessor and transmits the relative signal to the motors. It has two voltage pins, one of which is used to draw current for the working of the LD and the other is used to apply voltage to the motors. The LD switches it output signal according to the input received from the microprocessor.

An important thing to note is that the LD simply transmits the signal it receives. It does not change the signal in any case. The LD is a 16 pin IC, with eight pins, on each side, dedicated to the controlling of a motor. The Theory for working of a H-bridge is given below.

The basic diagram of H-bridge is given below :. These products are ideal for a variety of automotive applications such as electric power steering , brake booster , MHEV starter generator, active roll control, HVAC compressor s, pumps and fans , as well as any application where efficiency, space savings, and monitoring functions are priorities.

Consequently, reliability, durability, and accurate motion control have become critical for the functioning of body applications. As reliability and durability increase, the need for maintenance is reduced for BLDC motors. The H-bridge circuit will look like this in the picture below. Rotate in clockwise direction. Now, in the first condition, when S1 and S4 switches are closed, and S3 and S2 are open, the voltage will pass from the S1 switch to the Motor and then to the S4.

Hence we have a complete circuit that will allows current to flow from V to M through S1 and S4. This state will be a short circuit in S1 and S4 switch condition. In this case, the Motor will be in ON, and the direction of the Motor will be in a clockwise rotation. Rotate in counter-clockwise direction. Coming to the Next state, when we enable S3 and S2 by giving voltage input, then the S1 and S4 switches will close, and the voltage travels from S3 and S2.

This is also a positive connection by enabling two parallel-connected switches, but the rotation of the Motor will be in a counter-clockwise direction. To turn off the Motor, either we can turn off the voltage supply, or we can open all the switches in Motor. And note that you can only turn on two parallel connected switches at a time.