Overview
The DRV10974PWPR, produced by Texas Instruments, is a 12-V nominal, three-phase sensorless BLDC (Brushless DC) motor driver. This device is designed for cost-sensitive, low-noise, and low-external-component-count applications. It integrates power MOSFETs and uses a proprietary sensorless control scheme to provide dependable commutation with 180° sinusoidal output voltages, significantly reducing pure tone acoustics. The device supports continuous drive current up to 1 A (rms) and is suitable for various motor drive applications requiring efficient and reliable operation.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Operating Ambient Temperature (TA) | -40 | 85 | °C | |
| Operating Junction Temperature (TJ) | -40 | 125 | °C | |
| Supply Voltage (VCC) | 4.4 | 18 | V | |
| Continuous Drive Current | 1 | A (rms) | ||
| PWM Input Frequency | 0.1 | 100 | kHz | |
| Phase Output PWM Frequency | 25 | kHz | ||
| Current-Limit Threshold | 0.2 | 1.6 | A | |
| Junction-to-Ambient Thermal Resistance (RθJA) | 37.8 | 34.5 | °C/W |
Key Features
- Sensorless Control Scheme: The DRV10974 uses a proprietary 180° sinusoidal commutation scheme, reducing pure tone acoustics and providing dependable commutation without the need for external sensors.
- Integrated Power MOSFETs: The device includes integrated power MOSFETs, enabling continuous drive current up to 1 A (rms).
- Simple Control Interface: Motor speed is controlled via a PWM input, and the direction of rotation is controlled by the FR pin. The acceleration ramp rate is controlled by the RMP pin, and the current limit is set by an external resistor on the CS pin.
- Efficiency Optimization: The device allows for efficiency optimization through resistor-configurable lead angle and the use of low-rDS(on) MOSFETs to conserve power.
- Extensive Protection Mechanisms: Includes overcurrent protection, undervoltage lockout (UVLO), thermal shutdown, and phase short circuit protection (phase to phase, phase to ground, phase to supply).
- Low-Power Mode: The device enters a low-power mode when the motor is not spinning, turning off unused circuits to conserve power).
- Motor Speed Feedback: The FG pin provides an indication of the motor speed, allowing for real-time monitoring and control).
Applications
- Consumer Electronics: Suitable for applications in consumer electronics such as fans, pumps, and other small motor-driven devices).
- Industrial Automation: Used in industrial automation for controlling motors in various machinery and equipment).
- Automotive Systems: Can be applied in automotive systems for motor control in vehicles).
- Medical Devices: Applicable in medical devices that require precise and reliable motor control).
Q & A
- What is the maximum continuous drive current of the DRV10974?
The DRV10974 can provide a continuous drive current up to 1 A (rms).
- What is the operating voltage range of the DRV10974?
The device operates within a supply voltage range of 4.4 V to 18 V.
- How is the motor speed controlled in the DRV10974?
The motor speed is controlled by applying a PWM input to the device, which determines the magnitude of the drive voltage. The speed can also be monitored using the FG pin.
- What protection mechanisms are included in the DRV10974?
The device includes overcurrent protection, undervoltage lockout (UVLO), thermal shutdown, and phase short circuit protection.
- How is the direction of motor rotation controlled in the DRV10974?
The direction of motor rotation is controlled by setting the input on the FR (forward-reverse) pin to a logic 1 or logic 0 state.
- What is the purpose of the FG pin in the DRV10974?
The FG pin provides an indication of the motor speed and toggles at a rate of one time during an electrical cycle, allowing for real-time speed monitoring.
- How does the DRV10974 optimize efficiency?
The device optimizes efficiency through resistor-configurable lead angle and the use of low-rDS(on) MOSFETs to conserve power.
- What is the thermal resistance of the DRV10974 in HTSSOP and VQFN packages?
The junction-to-ambient thermal resistance (RθJA) is 37.8 °C/W for HTSSOP and 34.5 °C/W for VQFN packages.
- How does the DRV10974 handle motor lock conditions?
The device detects motor lock conditions and acts to protect the motor and the device through various fault-detect mechanisms.
- What is the low-power mode in the DRV10974?
The device enters a low-power mode when the motor is not spinning, turning off unused circuits to conserve power.
