3-Phase BLDC Motor Sensorless Control Using MC56F8013

HardwareTable 4-1. Electrical Characteristics of EVM33395 BoardCharacteristic Symbol Min Typ Max UnitsPower supply voltage Vdc 10.2 12 16 VQuiescent current I CC — 70 — mAHigh state logic 1 input voltage V IH 2.4 3.3 or 5 7 VLow state logic 0 input voltage V IL — < 0.4 0.8 VInput resistance R In — 10 — kΩAnalog output range V Out 0 — 3.3 VPhase current sense voltage I Sense — 172 — mV/ABus voltage sense voltage V Bus — 206 — mV/VPower MOSFET On resistance R DS(On) — 10 16 mΩRMS output current I M — — 10 ATotal power dissipation P diss — — 18 W4.2.2.2 Micro Power BoardFreescale’s embedded motion control series three-phase micro power stage is a 12 V, 3 A, surface-mountpower stage. In combination with one of the embedded motion control series control boards, it providesa software development platform that allows algorithms to be written and tested without the need todesign and build a power stage. It supports algorithms that use Hall sensors and back-EMF signals forsensorless control.The three-phase micro power stage does not have any over-current protection that is independent of thecontrol board, so some care in its setup and use is required if a lower impedance motor is used. With themotor that is supplied in the kit, the power output stage will withstand a full stall condition without the needfor over-current protection. Current measuring circuitry is set up for 8.25 A, full scale. In a 25°C ambientoperation at up to 3 A continuous RMS output current is within the board’s thermal limits.3-Phase BLDC Motor Sensorless Control using MC56F8013, Rev. 050 Freescale Semiconductor