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Power IntegrationsRevs Up Motor-Drive Offering With BridgeSwitch-2 BLDC IC Family


BLDC motor hardware-software combo slashes inverter sleep-mode consumption to less than 10 mW, expands output power to 1 HP

Power Integrations (NASDAQ: POWI), the leader in high-voltage integrated circuits for energy-efficient power conversion,today enhanced its hardware-software bundle for brushless DC motors (BLDC) with BridgeSwitch™-2, a new high-voltage integrated half-bridge (IHB) motor-driver IC familytargeting applications up to 1 HP (746 W). The new ICs, which feature high- and low-side drivers and advanced FREDFETs with integrated lossless current sensing, deliver inverter efficiency of up to 99 percent.The IHB architecture eliminates hot spots,which increases design flexibility and reliability, slashes component count and saves PCB area. BridgeSwitch-2 is supported by Power Integrations’ MotorXpert™ software suite whichincludes single-phase trapezoidal control and three-phase sensor-less Field Oriented Control (FOC) modules, speeding inverter development.

BridgeSwitch-2ICs handle operational exceptions in hardware, which permits the use of IEC60730 Class Asafety software, reducing certification time by months.Quiescent BLDC inverters can be ordered into sleep-mode, reducing driver power consumption to less than 10 mW; this leaves more power available under regulated standby power limits to be allocated for loads such as network access and monitoring.

Cristian Ionescu-Catrina, product marketing manager at Power Integrations,said: “The low standby consumption of BridgeSwitch-2-based motor drivesenables designers to meet new and emerging EU ERP regulations.BridgeSwitch-2 ICs are also far more efficient than IGBT based IPMs across the entire load range.”He continued: “From startup to performanceoptimization,the GUI-based tool, terminal emulatorand MISRA C-compliant code library of MotorXpertgreatly simplifiesthe design process, allowing the motor architecture to be optimized in real-time without repeated firmware updates. BridgeSwitch-2 is microprocessor agnostic, easing its adoption into existing systems – this is important as engineers update designs to meet more stringent standby regulations.”

BridgeSwitch-2ICs addressa power range of 30 to 746 W (1 HP), encompassing a broad range of applications includingheat exchanger fans, refrigerator compressors, fluid and circulation pumps, gas boiler combustion fans, washing machine drums and kitchen blenders and mixers.The IHB architecture reduces component count by 50 percent and PCB space by 30 percent over discrete designs by eliminating shunt resistors and associated signal conditioning circuits. Shunt losses are also eliminated, improving efficiency. Precise motor control is achieved with the built-inreal-time reporting of phase current (IPH)information. Accurate turn-on/off gate drive and a soft-body diode result in a typical EMI profile 10 dB lower than existingdrivers, so a smaller EMI filter can be selected.

BridgeSwitch-2ICs feature built-in DC overvoltage protection and current limitsthat protect the inverter and the system without relying on system software. Thechoice of error-flag or comprehensive faultbus reporting supports a range of system requirements.Emerging use-cases like failure prediction are now possible with the high accuracy of the built-in IPH information and comprehensive reporting via the fault bus. BridgeSwitch-2 motor drives use built-in, hardware-based low- and high-side over-current protection to meet IEC60335-1 Class A requirements. BridgeSwitch-2 also works without an auxiliary power supply,further reducing PCB area and component count.

Availability & Resources

Pricing for BridgeSwitch-2 ICs startsat $0.48 for 10,000-unit quantities. A 150 W reference designand design report, RDK-974can be freely downloaded. For further information, contact a Power Integrations sales representative or one of the company’s authorized worldwide distributors—DigiKey, Newark, Mouser and RS Components, or visit

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