Power Integrations has expanded its BridgeSwitch family of half-wave motor (IHB) drive ICs with the 400W BRD1167 and BRD1267, which deliver up to 1.33Aeff and a peak DC output current of 11.5A.
BridgeSwitch ICs feature advanced high-side and low-side FREDFETs (Fast Recovery Diode Field Effect Transistors), with integrated loss-less current sensing, providing up to 99.2% inverter efficiency in brushless DC (BLDC) motor control applications. This efficiency, together with the distributed thermal structure of the IHB drive, eliminates the need for a heatsink, reducing both system weight and cost.
Like the other members of the BridgeSwitch family, Power Integrations' new circuits are self-powered and available in the same compact InSOP-24C surface-mount package. These devices can drive synchronous or asynchronous, high-voltage single-phase or multi-phase motors, and support all popular motor and microcontroller control algorithms.
All BridgeSwitches feature hardware-based cycle-by-cycle over-temperature, over/under-voltage and over-current protection circuitry, which eliminates the need for software components for many of the protection functions, thereby simplifying IEC 60335 and 60730 certification procedures and reducing time and costs.
BridgeSwitch: system monitoring and device protection
The new BRD1167 and BRD1267 devices for higher powers incorporate system monitoring and device protection functions, as well as featuring an intuitive single-wire preventive maintenance interface, allowing communications between the motor's microcontroller and up to three BridgeSwitches.
Each BridgeSwitch can be configured with different high-side and low-side current limits, eliminating the need for the microcontroller and external circuitry to protect the system from open-circuit or short-circuit conditions of the motor windings.
The higher manageable power will allow the circuits to be used in applications that have to meet complex thermal requirements and higher rms currents (cooker hoods, compressors, fans and pumps).
