RDK-872, Reference Design Board, BRD1261C, Single-Phase Brushless DC Motor

RDK-872 is a 70W, 97% efficient, single-phase inverter for a high voltage single-phase brushless DC (BLDC) motor application using BridgeSwitch motor driver IC. The single-phase BLDC motor is driven up to 0.35ARMS phase current and an operational speed of up to 6380RPM. The single-phase inverter is implemented using two fully integrated BridgeSwitch (BRD1261C) devices in a small footprint surface mount package with exposed pads that enables heat dissipation through PCB itself. The design demonstrates device performance, internal fault protections and system level monitoring enabled by high level of integration of BridgeSwitch half-bridge motor driver. It utilizes a simple control interface that incorporates inverter control inputs, instantaneous phase current information signals and single-wire status update communication bus. It also features an optional external supply input for externally biased operation of low-side bypass capacitors for low no-load input power consumption.

• Used as 70W single-phase inverter using BridgeSwitch for fan application
• 180 to 265VAC input, 6380RPM for electronically commutated (EC) centrifugal fan
• Integrated 600V FREDFETs with ultra-soft, fast recovery diodes
• Less than 60°C package temperature at 29°C ambient with no external heat sink
• Fully self biased operation, no auxiliary power supply needed
• Supports low-side external bias operation for low no-load input power
• Integrated high-side and low-side cycle-by-cycle current limit on each BridgeSwitch device
• Instantaneous phase current information output on each BridgeSwitch device
• High voltage DC bus monitoring with four undervoltage and one overvoltage thresholds
• Two level device overtemperature protection, single wire status update communication bus