Overview
The Texas Instruments DRV8871DDAR is a brushed-DC motor driver designed for a variety of applications including printers, appliances, industrial equipment, and other small machines. This device features an H-bridge driver consisting of four N-channel MOSFETs, enabling bidirectional motor control with up to 3.6-A peak current. The motor speed can be controlled using pulse-width modulation (PWM) with a choice of current-decay modes. The DRV8871 also includes advanced current-regulation circuitry that does not require an analog voltage reference or external sense resistor, instead using a standard low-cost resistor to set the current threshold. This design helps reduce system power requirements and bulk capacitance, especially during motor startup and stall conditions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VM Operating Voltage | 6.5 | - | 45 | V |
| Logic Input Voltage (IN1, IN2) | 0 | - | 5.5 | V |
| PWM Frequency | 0 | - | 200 kHz | - |
| Peak Output Current | 0 | - | 3.6 A | - |
| Operating Ambient Temperature | -40 | - | 125 °C | - |
| RDS(on) (HS + LS) | - | 565 mΩ | - | - |
| Thermal Shutdown Temperature | 150 | - | 175 °C | - |
| Package Type | - | - | 8-Pin HSOP with PowerPAD™ | - |
| Package Size | - | - | 4.9 × 6 mm | - |
Key Features
- H-Bridge Motor Driver: Drives one DC motor, one winding of a stepper motor, or other loads.
- Wide Operating Voltage: 6.5-V to 45-V.
- PWM Control Interface: Allows for motor speed control using PWM signals.
- Current Regulation Without a Sense Resistor: Uses a standard low-cost resistor to set the current threshold.
- Low-Power Sleep Mode: Enters sleep mode when both inputs are low, reducing power consumption.
- Integrated Protection Features:
- Undervoltage Lockout (UVLO)
- Overcurrent Protection (OCP)
- Thermal Shutdown (TSD)
- Automatic Fault Recovery
- Small Package and Footprint: 8-Pin HSOP with PowerPAD™, 4.9 × 6 mm.
Applications
- Printers
- Appliances
- Industrial Equipment
- Other Mechatronic Applications
Q & A
- What is the peak current capability of the DRV8871DDAR?
The DRV8871DDAR can handle up to 3.6-A peak current.
- What is the operating voltage range of the DRV8871DDAR?
The operating voltage range is from 6.5 V to 45 V.
- How does the DRV8871DDAR control motor speed?
Motor speed can be controlled using pulse-width modulation (PWM) signals on the logic inputs.
- What type of protection features does the DRV8871DDAR have?
The device includes undervoltage lockout (UVLO), overcurrent protection (OCP), thermal shutdown (TSD), and automatic fault recovery.
- How does the current regulation work in the DRV8871DDAR?
The current regulation is set using a standard resistor attached to the ILIM pin, eliminating the need for an analog voltage reference or external sense resistor.
- What is the package type and size of the DRV8871DDAR?
The device comes in an 8-Pin HSOP package with PowerPAD™, measuring 4.9 × 6 mm.
- What happens when both inputs are set low on the DRV8871DDAR?
Setting both inputs low enters a low-power sleep mode.
- How does the DRV8871DDAR handle overcurrent conditions?
If the output current exceeds the OCP threshold, the device disables the FETs and resumes normal operation after a short retry period.
- What is the thermal shutdown temperature of the DRV8871DDAR?
The thermal shutdown temperature is between 150°C and 175°C.
- Can the DRV8871DDAR be used to drive stepper motors?
