MCT8317A datasheet(21/161 Pages) TI1

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8.3.7 Motor Control Input Options

The MCT8317A offers three ways of controlling the motor:

1. SPEED Control: In speed control mode, the speed of the motor is controlled using a closed loop PI control

according to the input reference.

2. POWER Control: In power control mode, the DC input power of the inverter power stage is controlled using a

closed loop PI control according to the input reference.

3. VOLTAGE Control: In voltage control mode, the voltage (duty cycle) applied to the motor is controlled

according to the input reference.

The MCT8317A offers four methods of directly controlling the reference input of the motor. The reference control

method is configured by SPD_CTRL_MODE.

The reference (speed or power or voltage) input command can be controlled in one of the following four ways.

• PWM input on SPEED/WAKE pin by varying duty cycle of input signal

• Frequency input on SPEED/WAKE pin by varying frequency of input signal

• Analog input on SPEED/WAKE pin or DACOUT/SOx/SPEED_ANA pin by varying amplitude of input signal

• Over I2C by configuring SPEED_CTRL

The signal path from SPEED pin input (or I2C based speed input) to output duty cycle (DUTY_OUT) applied to

FETs is shown in Figure 8-8.

DUTY_CMD

Speed/Power

PI Loop

PWM

AVS, CL_ACC

DUTY_OUT

Transfer

Function

FETs

PWM

Analog

PWM Duty

ADC

SPEED Pin

Freq

Freq based

Duty

VOLTAGE_REF (TARGET_DUTY)

Linear / Stair

case / Forw-

Rev Profiles

SPEED_REF

POWER_REF

REF_PROFILE_

CONFIG != 00b

REF_PROFILE_

CONFIG = 00b

CLOSED_LOOP_MODE

Figure 8-8. Multiplexing the Control Input Command

8.3.7.1 Analog Mode Speed Control

Analog input based speed control can be configured by setting SPD_CTRL_MODE to 00b. In this mode, the duty

command (DUTY_CMD) varies with the analog voltage input on the SPEED pin (VSPEED). When 0 ≤ VSPEED ≤

VEN_SB, DUTY_CMD is set to zero and the motor is stopped. When VEX_SB ≤ VSPEED ≤ VANA_FS, DUTY_CMD

varies linearly with VSPEED as shown in Figure 8-9. VEX_SB and VEN_SB are the standby entry and exit thresholds

- refer Section 8.4.1.2 for more information on VEX_SB and VEN_SB. When VSPEED > VANA_FS, DUTY_CMD is

clamped to 100%.

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MCT8317A

SLLSFQ2 – JANUARY 2023

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