Overview
The DRV11873PWPR is a 12-V, 3-phase, sensorless Brushless DC (BLDC) motor driver produced by Texas Instruments. This device is designed to provide efficient and reliable control for three-phase BLDC motors, making it suitable for a variety of applications including cooling fans and other motor-driven systems. The DRV11873PWPR integrates power MOSFETs, eliminating the need for external power stages, and features advanced protection mechanisms to ensure robust operation.
Key Specifications
| Parameter | Value | Description |
|---|---|---|
| VCC Input Voltage | 4.1 V to 12 V | Operating voltage range |
| Drive Current Capability | Up to 1.5 A continuous, 2 A peak | Maximum current the device can handle |
| Switching Frequency | 125 kHz (FS pin high), 62.5 kHz (FS pin low) | Frequency at which the motor driver MOSFETs operate |
| PWMIN Frequency Range | 7 kHz to 100 kHz | Range of frequencies for PWM input |
| Operating Temperature | –40°C to 125°C | Temperature range for device operation |
| Package Type | 16-pin HTSSOP | Physical package of the device |
| UVLO Threshold | 4.1 V (lockout), 4.3 V (wake-up) | Undervoltage lockout thresholds |
| Overcurrent Protection | Adjustable through external resistor | Protection mechanism against overcurrent conditions |
Key Features
- Sensorless BEMF Control: Implements a 150° sensorless BEMF control scheme for three-phase motors.
- Speed Control: Motor speed can be controlled via PWMIN or VCC pin adjustments.
- High Efficiency: Synchronous rectification PWM operation for increased efficiency.
- Protection Mechanisms: Includes overcurrent protection, undervoltage lockout (UVLO), lock detection, voltage surge protection, and thermal shutdown.
- Integrated 5-V LDO: Provides a 5-V bias voltage for external use up to 20 mA.
- Motor Status Indicators: FG and RD open-drain outputs to indicate motor status.
Applications
- Appliance Cooling Fans: Suitable for cooling fans in household appliances.
- Desktop Cooling Fans: Ideal for cooling systems in desktop computers.
- Server Cooling Fans: Used in server cooling systems to ensure reliable operation.
Q & A
- What is the operating voltage range of the DRV11873PWPR?
The operating voltage range is from 4.1 V to 12 V.
- How can the motor speed be controlled using the DRV11873PWPR?
Motor speed can be controlled by adjusting the PWMIN duty cycle or the VCC input voltage.
- What is the switching frequency of the motor driver MOSFETs?
The switching frequency is 125 kHz when the FS pin is high and 62.5 kHz when the FS pin is low.
- What protection mechanisms are integrated into the DRV11873PWPR?
The device includes overcurrent protection, UVLO, lock detection, voltage surge protection, and thermal shutdown.
- What is the purpose of the FG and RD outputs?
The FG and RD outputs are open-drain outputs that indicate the motor status.
- How is the overcurrent protection adjusted in the DRV11873PWPR?
The overcurrent protection can be adjusted through an external resistor connected to the CS pin and ground.
- What is the UVLO threshold for the DRV11873PWPR?
The UVLO threshold is 4.1 V for lockout and 4.3 V for wake-up.
- What is the package type of the DRV11873PWPR?
The device is packaged in a 16-pin HTSSOP.
- What are some common applications of the DRV11873PWPR?
Common applications include appliance cooling fans, desktop cooling fans, and server cooling fans.
- What is the operating temperature range of the DRV11873PWPR?
The operating temperature range is from –40°C to 125°C.
