L6203 DC motor controller circuit

Description: The L620x is a monolithic full bridge switching motor driver implemented using the new Multipower-BCD technology. This technology enables the integration of multiple isolated DMOS power transistors along with mixed CMOS/bipolar control circuits. The L620x series includes various versions: L6201, L6202, L6203, and L6201PS. All motor driver circuits are identical, with the primary differences being the total RMS current ratings: 1A for L6201, 2A for L6202, and 4A for L6203 and L6201PS. A transconductance amplifier is utilized for speed control, as illustrated in the circuit schematic. In this configuration, only half of the L6506 is employed, while the other half can be utilized to control a second motor. The L6506 monitors the motor current by sensing the voltage across the sense resistor RS; it compares the sensed voltage to regulate motor speed and during braking. VS represents the maximum supply voltage anticipated for the application, Ip denotes the peak load current, and dv/dt indicates the limited rise time of the output voltage, typically set at 200V/ms.

The L620x series motor driver is designed for efficient control of motor applications, providing a robust solution for driving DC motors and stepper motors in various electronic systems. The integration of DMOS transistors allows for lower on-resistance and improved thermal performance, which is crucial for high current applications. The device's ability to handle different RMS current ratings makes it versatile for various motor specifications.

In the context of speed control, the transconductance amplifier plays a pivotal role by adjusting the output based on feedback from the motor's operational parameters. The use of a sense resistor (RS) is critical for current monitoring. By measuring the voltage drop across RS, the L6506 can accurately determine the current flowing through the motor, enabling precise control of the motor speed and effective braking.

The maximum supply voltage (VS) must be carefully selected to match the application's requirements, ensuring that it remains within the operational limits of the L620x series. The peak load current (Ip) is a significant parameter, as it influences the selection of the driver based on the motor's characteristics. The rise time of the output voltage (dv/dt) is also a critical factor, as it affects the switching performance and efficiency of the motor driver circuit.

Overall, the L620x series motor driver, with its advanced technology and features, is suitable for applications requiring reliable and efficient motor control, making it an ideal choice for robotics, industrial automation, and consumer electronics.The L620x is a monolithic full bridge switching motor driver realized in the new Multipower-BCD technology which allows the integration of multiple, isolated DMOS power transistors plus mixed CMOS/bipolar control circuits and is available in many versions : L6201 /1PS/2/3. All this motor driver circuits are identically, the differences between t hem is the total RMS current, which is up to : 1A for L6201, 2A for L6202 and 4A for L6203 and L6201PS. transconductance amplifier for speed control, as shown in this circuit schematic. In this configuration only half of the L6506 is used and the other half of the device may be used to control a second motor.

The L6506 senses the voltage across the sense resistor RS to monitor the motor current: it compares the sensed voltage both to control the speed and during the brake of the motor. VS is the maximum Supply Voltage foreseen on the application; Ip is the peak of the load current; dv/dt is the limited rise time of the output voltage (200V/ms is generally used).