ZHCSCV7 August 2014 DRV8833C
PRODUCTION DATA.
The DRV8833C is used in stepper or brushed DC motor control. The following design procedure can be used to configure the DRV8833C in a bipolar stepper motor application.

Table 5 gives design input parameters for system design.
| Design Parameter | Reference | Example Value |
|---|---|---|
| Supply voltage | VM | 9 V |
| Motor winding resistance | RL | 12 Ω/phase |
| Motor winding inductance | LL | 10 mH/phase |
| Motor full step angle | θstep | 1.8 °/step |
| Target stepping level | nm | 2 (half-stepping) |
| Target motor speed | v | 120 rpm |
| Target chopping current | ICHOP | 200 mA |
| Sense resistor | RISEN | 1 Ω |
The first step in configuring the DRV8833C requires the desired motor speed and stepping level. The DRV8833C can support full- and half-stepping modes using the PWM interface.
If the target motor speed is too high, the motor does not spin. Ensure that the motor can support the target speed.
For a desired motor speed (v), microstepping level (nm), and motor full step angle (θstep),

Figure 10. Full-Step Mode
Figure 11. Half-Step Mode
The chopping current (ICHOP) is the maximum current driven through either winding. This quantity depends on the sense resistor value (RXISEN).

ICHOP is set by a comparator which compares the voltage across RXISEN to a reference voltage. Note that ICHOP must follow Equation 4 to avoid saturating the motor.

where
