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24 Powering Up Your Design Introducing the Qorvo PAC5556 The Qorvo PAC5556 Power Application Controller ® (PAC ™ ) is supplied in a slim QFN-52 package, can operate motors up to 600V DC , and incorporates a comprehensive set of features and functions necessary for any BLDC or smart energy application (Figure 1). The highly integrated PAC architecture makes the Qorvo PAC5556 especially well-suited for applications where the PCB is shrinking, such as white goods, compressors, and power tools. A 150MHz 32-bit Arm ® Cortex ® -M4F microcontroller core with 128kB of user-programmable flash memory is at the heart of the device. A nested vectored interrupt controller (NVIC), capable of accommodating up to 25 external interrupts, provides a wake-up function to enable the device to come back from different sleep modes. Clock-gating of the 24- bit real-time clock permits low-power operation. The microcontroller unit (MCU) also incorporates a high-speed 12-bit ADC. Configured for little-endian operation, PAC5556's Arm ® Cortex ® -M4F microcontroller core includes hardware support for multiplication and division, DSP instructions, and an IEEE754 single-precision Floating Point Unit (FPU). The integrated FPU supports complex high- resolution control algorithms, such as the ones used with FOC. The high-performance features of this MCU enable design engineers to easily implement complex real-time algorithms, safety software, and diagnostics in their applications. A pulse-width modulation (PWM) engine provides the drive signals for the motor gate drivers. Capable of fine motor control, down to 10ns, the PWM engine consists of four 16-bit timers and 32 channels. The analog front end of the PAC5556 is highly configurable and offers both differential and single- ended programmable gain amplifiers, 6 comparators, 10-bit DACs, programmable over-current protection, integrated VM ADC sampling, and I/Os for inter- connectible and programmable signal sampling, feedback amplification, and sensor monitoring of multiple analog input signals. These analog capabilities make the device suitable for use in field-oriented control or sensor-based BLDC control applications. Other salient attributes of the Qorvo PAC5556 include a configurable power manager and application-specific power drivers. The configurable power manager contains a multi- mode switching supply converter that permits the IC and the motor-drive circuits to be powered using a buck-converter topology. On-chip linear regulators provide the IC supply rails, and the power management functions control the available sleep and hibernate modes. Designers can optimize the power manager for run-time and standby modes. PAC's very small standby current results in very good battery life in battery-powered tools when not in use. In equipment that is always connected to an AC (such as white goods), the power manager can help with ENERGY STAR ratings. The power driver block provides all the necessary high- and low-side gate drivers suitable for use in various motor-drive configurations, including half-bridge and full H bridge. A simplified diagram of the Qorvo PAC5556 used to drive a BLDC motor is illustrated in Figure 2. To aid the prototyping and development process, an evaluation board based around the Qorvo PAC5556 is available. The Qorvo PAC5556EVK1 is a complete, fully featured evaluation and prototyping platform for the PAC5556 (Figure 3). The evaluation board supports gate driving for up to three half H-bridge inverters with ratings up to 220V AC or 450V DC . A virtual COM port connection to a computer and a GUI-based software suite permits configuration and control of any application running on the PAC5556EVK1. Figure 1: The image provides a simplified functional block diagram of the Qorvo PAC5556 power application controller. (Source: Qorvo). PAC5556 Power Application Controller LEARN MORE >