SLOA312 December 2021 DRV8412 , DRV8424 , DRV8426 , DRV8428 , DRV8434 , DRV8436 , DRV8803 , DRV8804 , DRV8805 , DRV8806 , DRV8844 , DRV8847 , DRV8932 , DRV8935 , DRV8955
PRODUCTION DATA
3.1 Driving Unipolar Motor with Four-channel Low-side Driver
To drive a unipolar stepper motor with a single supply connection, only four low side MOSFETs and circulating diodes are needed. The schematic with such a low-side MOSFET driver is shown in Figure 3-1.
Figure 3-1 Driving Unipolar Stepper with Low-side DriverDRV8803, DRV8804, DRV8805 and DRV8806 from Texas Instruments are examples of such drivers meant to drive unipolar motors. These drivers are rated up to 60 V supply voltage, available in PWM, STEP/DIR or serial interfaces, and can deliver up to 2 A per channel.
Table 3-1 summarizes the major features of these four drivers.
| Driver | DRV8803 | DRV8804 | DRV8805 | DRV8806 |
|---|---|---|---|---|
| Maximum Supply Voltage | 60 V | 60 V | 60 V | 40 V |
| MOSFET RDS (ON) | 0.5 Ω | 0.5 Ω | 0.5 Ω | 0.5 Ω |
| Input Interface | PWM (EN/INx) | Serial Interface | STEP/DIR with full-step, half-step and wave drive | Serial Interface |
| Package Options | SOIC-20, HTSSOP-16 | SOIC-20, HTSSOP-16 | SOIC-20, HTSSOP-16 | HTSSOP-16 |
| Maximum Continuous Output Current | 1.5 A (SOIC), 2 A (HTSSOP) | 1.5 A (SOIC), 2 A (HTSSOP) | 1.5 A (SOIC), 2 A (HTSSOP) | 2 A |
| Integrated Clamp Diodes | Yes | Yes | Yes | Yes |
| Protection Features | Overcurrent, Short circuit, Undervoltage, Overtemperature | Overcurrent, Short circuit, Undervoltage, Overtemperature | Overcurrent, Short circuit, Undervoltage, Overtemperature | Overcurrent, Short circuit, Undervoltage, Overtemperature, Open load detection |
A typical application schematic with the DRV8803 is shown in Figure 3-2.
Figure 3-2 Unipolar Stepper Schematic with DRV8803