Description

TIDA-00447 is a 24V: dual Brushless DC (BLDC) motor drive reference design to be used in major home appliances to drive low voltage BLDC motors such as pumps and fans: e.g. for circulation pump and drain pump of dishwashers. The power stages of motor drive are designed for 100W and 30W of continuous operation respectively. The 30W drive is based on a single chip: low external component count three-phase motor driver with integrated power MOSFETs and offers proprietary sensorless control scheme to provide continuous sinusoidal drive. It also features an integrated buck/linear regulator to efficiently step down the supply voltage to either 5 or 3.3 V for powering both internal and external circuit. The 100W drive is implemented using discrete approach having an MCU: external MOSFET driver with protections & current sensing and external power MOSFETs. This architecture offers the flexibility to scale the drive power level as needed. The MCU is programmed with InstaSPIN-BLDC software that implements sensorless trapezoidal control of BLDC motor using back-EMF integration method and it is also used to configure & control the speed of drain pump stage. Isolated UART interface enables communication of the drive unit with the main user interface controller. This reference design is fully tested for full load operation: over current and motor stall protections.