Datasheet

TMC4671 Datasheet • IC Version V1.3 | Document Revision V2.00 • 2020-Apr-17

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4.9.2 PWM Engine and associated Motor Connectors

The PWM engine of the TMC4671 has eight gate control outputs to control up to four power MOS half

bridges. For three-phase motors tree half bridges are used (U, V, W). For two-phase stepper motors four

half bridges are used for (U, V, W, Y). For DC motor control, the ﬁrst two half bridges (U, V) are used.

Gate Control Signals FOC3: 3 Phase Motor FOC2: 2 Phase Stepper FOC1: Single Phase DC Motor

PWM_UX1_H

U X1 X1

PWM_UX1_L

PWM_VX2_H

V X2 X2

PWM_VX2_L

PWM_WY1_H

W Y1 -

PWM_WY1_L

PWM_Y2_H

- Y2 -

PWM_Y2_L

Table 22: FOC321 Gate Control Signal Conﬁgurations

For the DC motor current control (here named FOC1), the number of pole pairs is not relevant - in contrast

to closed loop current control of two-phase stepper motors (FOC2) and three-phase permanent magnet

motors (FOC3). For DC motor control, the number of pole pairs should be set to 1 to equal mechanical

angle and electrical angle for velocity control and for position control.

Figure 38: FOC3 (three phase motor), FOC2 (two phase stepper motor), FOC1 (single phase DC motor)

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