MCT8317A datasheet(29/161 Pages) TI1

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

at REF_CLAMP2. REF_CLAMP2 configures this constant speed/power reference between DUTY_CLAMP2

and DUTY_OFF2. There is a step change in speed/power reference from REF_E to REF_CLAMP2 at

DUTY_E.

• DUTY_ON2 configures the duty command below which MCT8317A starts driving the motor (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 will change from

REF_CLAMP2 to REF_OFF2.

8.3.7.5.3 Forward-Reverse Reference Profile

DUTY_ON1

DUTY_CMD (%)

REFERENCE (SPEED/POWER)

REF_CLAMP1

DUTY_OFF1

DUTY_CLAMP1

DUTY_OFF2

DUTY_ON2

DUTY_A

DUTY_CLAMP2

DUTY_B

DUTY_C

DUTY_D DUTY_E

REF_CLAMP2

REF_OFF1

REF_OFF2

REF_A

REF_D

Forward Direction

OUT A

OUT B

OUT C

Reverse Direction

OUT A

OUT C

OUT B

STEP_

HYST_

BAND

STEP_

HYST_

BAND

Figure 8-16. Forward-Reverse Reference Profile

Forward-Reverse speed/power profile can be configured by setting REF_PROFILE_CONFIG to 11b. Forward-

Reverse speed/power profile features direction change through adjusting the duty command. DUTY_C

configures duty command at which the direction will be changed. The Forward-Reverse speed/power profile

can be used to eliminate the separate signal used to control the motor direction.

• DUTY_ON1 configures the duty command above which MCT8317A starts driving the motor in the forward

direction (to speed/power reference set by REF_CLAMP1) when the current speed/power reference is zero.

When current speed/power reference is zero and duty command is below DUTY_ON1, MCT8317A continues

to be in off state and motor is stationary.

• DUTY_OFF1 configures the duty command below which the speed/power reference changes in the forward

direction from REF_CLAMP1 to REF_OFF1.

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MCT8317A

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