Texas Instruments DRV8421 Dual H-Bridge Motor Driver
Texas Instruments DRV8421 Dual H-Bridge Motor Driver is ideal for home appliances and other mechatronic applications. The device can drive a bipolar stepper motor, one or two DC motors, or other loads. A PWM interface allows easy interfacing with controller circuits. The output block of each H-bridge driver consists of N-channel power MOSFETs configured as full H-bridges to drive the motor windings. The DRV8421 can drive a maximum current of 2A from each output or 4A in parallel mode (with proper heat sinking at 12V and TA = 25°C).
The device contains two versions (a 4-wire input (DRV8421A) or a 2-wire input (DRV8421B)). The 2-wire input version (DRV8421B) includes features like enable and fault detection, while the 4-wire input version (DRV8421A) can drive four half bridges based on signals to four input terminals. A low-power sleep mode is also provided for the 2-wire input version. It shuts down internal circuitry to achieve a very low quiescent current draw. This sleep mode can be set by pulling the enable pin low.
Internal protection functions are provided for short-circuit protection, UVLO, OCP, and overtemperature. An nFAULT pin in the Texas Instruments DRV8421B, the 2-wire input device, indicates any fault conditions.
Features
- Dual H-bridge motor driver
- Single/dual brushed DC
- Stepper
- Solenoids
- 4 to 18V operating supply voltage range
- HS + LS = 900mΩ (typical, 25°C) low ON-resistance
- High output current per H-bridge
- 2A maximum driver current at 12V and TA = 25°C
- Parallel mode available capable of 4A maximum driver current at 12V and TA = 25°C
- Device versions
- DRV8421A (4-wire input) (independent half bridge control)
- DRV8421B (2-wire input) (sleep mode, fault detect)
- Similar LV stepper drivers
- DRV8410: 1.65 to 11V (800mΩ RDS(ON))
- DRV8411: 1.65 to 11V (400mΩ RDS(ON))
- DRV8411A: 1.65 to 11V (400mΩ RDS(ON))
- PWM control interface
- Low-current 3µA sleep mode (2-wire input version only)
- Thermally-enhanced surface mount package
- Protection features
- VM Undervoltage Lockout (UVLO)
- Overcurrent Protection (OCP)
- Thermal Shutdown (TSD)
- Fault condition indication pin (nFAULT) (2-wire input version only)
Applications
- Printers/scanners
- Refrigerators
- Vacuum cleaners
- Clothes dryer
- General brushed and stepper motors
