Brushed DC Motor Driver Chip

Brushed DC motor driver chip are among the most widely used motor types in fields including industrial control, consumer electronics, and smart hardware. They rely on brushes and a commutator to complete automatic switching of rotor phases, eliminating the need for additional external commutation logic control, and feature the characteristics of simple structure and low barriers to control implementation. Brushed DC (BDC) motor driver chip are integrated circuits specifically designed for driving BDC motors, undertaking core functions including power conversion, operational control, and status protection, and are therefore indispensable core components of BDC motor systems.

The DRV8215 is a high-performance integrated H-bridge motor driver that integrates speed regulation, voltage regulation, stall detection, current-sense output, current regulation, and protection circuitry on a single chip.

Its integrated speed and voltage regulation functions adjust motor speed or voltage based on collected motor voltage and current data, eliminating the need for external speed sensors. This reduces board area and design complexity, while lowering overall system costs. The integrated speed regulation function can maintain a constant motor speed even when the input power supply voltage fluctuates, thereby reducing current consumption and achieving long-term power saving. This capability is particularly critical for applications with variable load conditions or battery-powered scenarios where the input voltage is unstable. The soft-start and soft-stop functions realize controllable ramp-up and ramp-down of motor speed, which suppresses high inrush current and prevents damage to motor windings, ultimately improving system reliability and extending service life.

An on-chip internal current mirror supports current sensing and regulation, removing the requirement for bulky power shunt resistors, which saves board space and reduces system costs. The IPROPI current-sense output allows the microcontroller to detect motor stall or changes in load conditions. A built-in gain selection function enables high-precision current sensing, which can measure average motor current as low as 10mA. Via the VREF pin, the device can regulate motor current during startup and high-load operation without intervention from the microcontroller. The device also supports sensorless motor stall detection and reports stall status to the microcontroller.