MCT8317A datasheet(146/161 Pages) TI1

Part #	MCT8317A

Description	MCT8317A High Speed Sensorless Trapezoidal Control Integrated FET BLDC Driver

PDF	161 Pages

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Manufacturer	TI1 [Texas Instruments]

Direct Link	http://www.ti.com

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146 / 161 page

9.2.1.3 Faster startup time

Startup time is the time taken for the motor to reach the target speed from zero speed. Faster startup time can

be achieved in MCT8317A by tuning motor startup, open loop and closed loop settings. Figure 9-5 shows FG,

phase current and motor electrical speed waveform. Motor takes 50 ms to reach target speed from zero speed.

Phase current

Speed

Figure 9-5. Phase current, FG and motor speed - Faster startup time

9.2.1.4 Setting the BEMF threshold

The BEMF_THRESHOLD1 and BEMF_THRESHOLD2 values used for commutation instant detection in

MCT8317A can be computed from the motor phase voltage waveforms during coasting. For example, consider

the three-phase voltage waveforms of a BLDC motor while coasting as in Figure 9-6. The motor phase voltage

during coasting is the motor back-EMF.

Figure 9-6. Motor phase voltage during coasting

MCT8317A

SLLSFQ2 – JANUARY 2023

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MCT8317A Datasheet(PDF) 146 Page - Texas Instruments