SLLA643 August 2024 MCF8315C , MCF8315C-Q1 , MCF8316C-Q1
VM is the main power supply to MCF831xC devices and powers the charge pump, buck converter and AVDD LDO in addition to powering the 3-phase inverter that drives the BLDC motor. Typically, a bulk capacitor ranging from 10s-100s of µF depending on the allowable ripple, motor phase currents, switching frequency (decided by end user system requirements) is added between VM and PGND pins. VM bulk capacitor voltage rating needs to be at least twice the VM voltage.