SLOA312 December 2021 DRV8412 , DRV8424 , DRV8426 , DRV8428 , DRV8434 , DRV8436 , DRV8803 , DRV8804 , DRV8805 , DRV8806 , DRV8844 , DRV8847 , DRV8932 , DRV8935 , DRV8955
PRODUCTION DATA
3.3 Driving Unipolar Motor with Four-channel Half-Bridge Driver
Another way to drive a unipolar motor is to use four-channel half-bridge drivers, such as the DRV8932, DRV8935, DRV8955, DRV8844, DRV8847, and DRV8412. These drivers all feature PWM input interface, and therefore can be operated such that an external controller turns on low-side MOSFETs in succession to drive a unipolar stepper motor. Table 3-3 summarizes the major features of these half-bridge drivers.
| Driver | DRV8847 | DRV8932 | DRV8935 | DRV8955 | DRV8412 | DRV8844 |
|---|---|---|---|---|---|---|
| Maximum Supply Voltage | 18 V | 33 V | 33 V | 48 V | 52 V | 60 V |
| LS MOSFETRDS(ON) | 0.45 Ω | 0.45 Ω | 0.165 Ω | 0.165 Ω | 0.11 Ω | 0.24 Ω |
| Independent Half-bridge | Yes | No | No | Yes | Yes | Yes |
| Package Options | HTSSOP-16, QFN-16 | HTSSOP-28, QFN-24 | HTSSOP-28, QFN-24 | HTSSOP-28, QFN-24 | HTSSOP-44 | HTSSOP-28 |
| Maximum Continuous Output Current | 1 A | 1.5 A | 2.5 A | 2.5 A | 3 A | 2.5 A |
| Protection Features | Overcurrent,Short circuit, Undervoltage, Overtemperature | Overcurrent,Short circuit, Undervoltage, Overtemperature | Overcurrent,Short circuit, Undervoltage, Overtemperature | Overcurrent,Short circuit, Undervoltage, Overtemperature | Overcurrent,Short circuit, Undervoltage, Overtemperature | Overcurrent,Short circuit, Undervoltage, Overtemperature |
In the following section, this approach is described in detail by showing how unipolar stepper motors can be driven by the DRV8935. A typical application schematic with the DRV8935 is shown in Figure 3-5.
Figure 3-5 Unipolar Stepper Schematic
with DRV8935The PWM inputs can be controlled to drive a unipolar stepper motor in full-step or half-step modes, as described in the following subsections.