MCT8317A datasheet(30/161 Pages) TI1

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• DUTY_CLAMP1 configures the duty command below which speed/power reference will be the constant in

forward direction. REF_CLAMP1 configures constant speed/power reference between DUTY_CLAMP1 and

DUTY_OFF1.

• DUTY_A configures the duty command for speed/power reference REF_A. The speed/power reference

changes linearly between DUTY_CLAMP1 and DUTY_A.

• DUTY_B configures the duty command above which MCT8317A will be in off state. The speed/power

reference remains constant at REF_A between DUTY_A and DUTY_B.

• DUTY_C configures the duty command at which the direction is changed

• DUTY_D configures the duty command above which the MCT8317A will be in running state in the reverse

direction. REF_D configures constant speed/power reference between DUTY_D and DUTY_E.

• DUTY_CLAMP2 configures the duty command above which speed/power reference will be constant at

REF_CLAMP2 in reverse direction. The speed/power reference changes linearly between DUTY_E and

DUTY_CLAMP2.

• DUTY_ON2 configures the duty command below which MCT8317A starts driving the motor in the reverse

direction (to speed/power reference set by REF_CLAMP2) when the current speed/power reference is zero.

When current speed/power reference is zero and duty command is above DUTY_ON2, MCT8317A continues

to be in off state and motor is stationary.

• DUTY_OFF2 configures the duty command above which the speed/power reference changes in the reverse

direction from REF_CLAMP2 to REF_OFF2.

8.3.8 Starting the Motor Under Different Initial Conditions

The motor can be in one of three states when MCT8317A begins the start-up process. The motor may be

stationary, spinning in the forward direction, or spinning in the reverse direction. The MCT8317A includes a

number of features to allow for reliable motor start-up under all of these conditions. Figure 8-17 shows the motor

start-up flow for each of the three initial motor states.

Sta onary

Spinning in forward

direc on

Spinning in reverse

direc on

Align

Double Align

Slow rst cycle

Closed Loop

Coast (Hi-Z)

Brake

Reverse Drive

IPD

Brake

Figure 8-17. Starting the motor under different initial conditions

Note

"Forward" means "spinning in the same direction as the commanded direction", and "Reverse" means

"spinning in the opposite direction as the commanded direction".

MCT8317A

SLLSFQ2 – JANUARY 2023

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