DRV8461SPWPR datasheet(20/117 Pages) TI

20 / 117 page

7.3.2.3 Full-Scale Current Rating

The full-scale current describes the top of the sinusoid current waveform while microstepping. Because the

sinusoid amplitude is related to the RMS current, the full-scale current is also determined by the thermal

considerations of the device. The full-scale current rating is approximately √2 × IRMS for a sinusoidal current

waveform, and IRMS for a square wave current waveform (full step).

AOUT

Step Input

BOUT

Full-scale current

RMS current

Figure 7-3. Full-Scale and RMS Current

7.3.3 PWM Motor Drivers

The DRV8461 has drivers for two full H-bridges to drive the two windings of a bipolar stepper motor. Figure 7-4

shows the block diagram of the circuitry.

Gate

Drivers

Current

Sense

Current

Sense

AOUT1

AOUT2

PGNDA

Microstepping and

Current Regulation

Logic

Figure 7-4. PWM Motor Driver Block Diagram

7.3.4 Microstepping Indexer

Built-in indexer logic in the device allows a number of different step modes. The MICROSTEP_MODE bits in the

SPI register or the M0 and M1 pins are used to configure the step mode as shown in Table 7-5.

DRV8461

SLOSE98 – DECEMBER 2022

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