24V dual brushless DC motor drive reference design for dishwasher pumps

TIDA-00447 is a 24V, dual Brushless DC (BLDC) motor drive reference design to be used in dishwashers to drive water circulation pump and drain pump. The circulation pump and the drain pump drive stages are designed for 100W and 30W of continuous operation respectively. The drain pump 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 circulation pump 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.

Features:
24V dual brushless motor drive platform for pumps in Dishwasher using devices with extensive built-in protection features enabling safer, noiseless operation and small form factor.
The drain pump drive thermally designed for up to 30W continuous operation 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.
The drain pump controller integrates 5V/3.3V buck/linear converter and protection functions such as over current, voltage surge protection, UVLO protection and motor Lock detection.
The circulation pump drive thermally designed for up to 100W continuous operation is implemented using discrete approach having an MCU, external MOSFET driver with built-in protections & current sensing amplifier and external power MOSFETs.
The discrete implementation of water circulation pump offers flexibility of easily scaling up or scaling down the power level.
The MCU is programmed with InstaSPIN-BLDC software that implements sensorless trapezoidal control of BLDC motor using back-emf integration method offering robust low speed operation and finer control over the entire speed range.

Parts Include:
CSD17304Q3 30V N-Channel NexFET™ Power MOSFET
CSD88539ND 60-V Dual N-Channel NexFET Power MOSFET, CSD88539ND
DRV10983 24-V, 3-Phase Sensorless BLDC Motor Controller  
DRV8303 Three Phase Pre-Driver with Dual Current Shunt Amplifiers
ISO7421 Dual Channel, 1/1, 1Mbps Digital Isolator  
LMT84 1.5V-Capable, 10 uA Analog Output Temperature Sensor in SC70 and TO-92
MSP430G2544 MSP430G2x44 Mixed Signal Microcontroller 
TLV803S 3-Pin Voltage Supervisor with Active-Low, Open Drain Reset
TPD4S009 4-Channel ESD Solution for High-Speed Differential Interface 

Learn more by downloading the reference design below