H-Bridge Motor Driver
- Drives One DC Motor, One Winding of a
Stepper Motor, or Other Loads
)Wide 6.5-V to 45-V Operating Voltage
)565-mΩ Typical RDS(on) (HS + LS)
)3.6-A Peak Current Drive
)PWM Control Interface
)Current Regulation Without a Sense Resistor
)Low-Power Sleep Mode
)Small Package and Footprint
- 8-Pin HSOP With PowerPAD
- 4.9 × 6 mm
)Integrated Protection Features
- VM Undervoltage Lockout (UVLO)
- Overcurrent Protection (OCP)
- Thermal Shutdown (TSD)
- Automatic Fault Recovery
)Other Mechatronic Applications
The DRV8871 device is a brushed-DC motor driver for printers, appliances, industrial equipment, and other small machines. Two logic inputs control the Hbridge driver, which consists of four N-channel MOSFETs that can control motors bidirectionally with up to 3.6-A peak current. The inputs can be pulsewidth modulated (PWM) to control motor speed, using a choice of current-decay modes. Setting both inputs low enters a low-power sleep mode.
The DRV8871 device has advanced currentregulation circuitry that does not use an analog voltage reference or external sense resistor. This novel solution uses a standard low-cost, low-power resistor to set the current threshold. The ability to limit current to a known level can significantly reduce the system power requirements and bulk capacitance needed to maintain stable voltage, especially for motor startup and stall conditions.
The device is fully protected from faults and short circuits, including undervoltage (UVLO), overcurrent (OCP), and overtemperature (TSD). When the fault condition is removed, the device automatically resumes normal operation.