SLVUCC2 October   2021 MCT8316A

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Hardware Setup
      1. 1.1.1 Jumper Configuration
      2. 1.1.2 External Connections
  3. 2Quick Tuning
  4. 3Comprehensive Tuning
    1. 3.1 Cycle by cycle current limit
      1. 3.1.1 Selecting ILIMIT Pin Resistor
    2. 3.2 Motor Startup Settings
      1. 3.2.1 Motor Startup Profile
      2. 3.2.2 Motor startup method
        1. 3.2.2.1 Initial Position detect (IPD)
        2. 3.2.2.2 Double align
      3. 3.2.3 Selecting RMP_1 and RMP_2 Pin Resistors
    3. 3.3 Abnormal Speed Threshold
      1. 3.3.1 Selecting CONFIG_3 Pin Resistor
    4. 3.4 PWM Switching Frequency
      1. 3.4.1 Selecting CONFIG_1 Pin Resistor
    5. 3.5 Lead Angle
      1. 3.5.1 Steps to Tune Lead Angle
      2. 3.5.2 Selecting LDANGLE pin resistor
    6. 3.6 Slew Rate and Buck Voltage
      1. 3.6.1 Selecting SLEW_RATE Pin Resistor
  5. 4Revision History

2 Quick Tuning

The goal of quick tuning is to get the motor running quickly by populating the recommended resistor values shown in Table 2-1.

Table 2-1 Recommended Resistor Values

Pin number

Pin name

Resistor value

30

RMP_1

22 kΩ, ±5%

31

RMP_2

Tie to GND

32

LDANGLE

Tie to GND

33

CONFIG_1

62 kΩ, ±5%

36

ILIMIT

51 kΩ, ±5%

37

CONFIG_2

75 kΩ, ±5%

38

CONFIG_3

200 kΩ, ±5%

39

SLEW_RATE

10 kΩ, ±5%

Table 2-2 shows the default parameter values based on the recommended default resistor values shown in Table 2-1.

Table 2-2 Default Parameters

Parameter

Value

Unit

Startup profile

Medium acceleration

-

Motor startup method (MTR_STARTUP)

Double align

-

Align ramp rate (ALIGN_RAMP_RATE)

500

V/s

CLosed loop acceleration (CL_ACC)

75

V/s

Open loop duty cycle (OL_DUTY)

25

%

Open loop acceleration (OL_ACC_A1)

 25 Hz/s
Startup brake time (STARTUP_BRK_TIME) 100 ms
Slow first cycle frequency (SLOW_FIRST_CYC_FREQ)

0.5

Hz
Dynamic degauss (DYN_DEGAUSS_EN)

Disabled

-
Align time (ALIGN_TIME)

750

ms
Lead angle (LD_ANGLE)

0

deg
BEMF threshold (BEMF_THRESHOLD) 700

-
IPD Clock frequency (IPD_CLK_FREQ)

2000

Hz
PWM output frequency (PWM_FREQ_OUT) 50

kHz
ZC detection blanking time (TBLANK)

6

 µs
Open loop current (OL_ILIMIT)

3.33

A
Align current threshold (ALIGN_CURR_THR)

3.33

A
IPD current threshold (IPD_CURR_THR)

3.33

A
CSA gain (CSA_GAIN)

0.15

V/A
CBC current limit (ILIMIT) 4.67

A
Slew rate (SLEW_RATE)

50

 V/µs
Buck voltage output (BUCK_SEL)

3.3

V
OCP mode (OCP_MODE) Retry after 500 ms

-
ASR (EN_ASR) Disabled

-
Delay compensation (DELAY_COMP_EN) Disabled

-
OCP level (OCP_LVL)

15

A
Abnormal speed (ABN_SPEED)

4000

Hz
Minimum duty (MIN_DUTY)

5

%