MC33887PFK

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Power Management ICs (PMICs) are a vital component of any system designed to manage and control the power requirements of a modern electronic system. They are used to control the voltage and current levels of devices in order to reduce power consumption, increase efficiency and extend device life. The MC33887PFK from Freescale Semiconductor is an excellent example of this type of PMIC, as it is specifically designed for motor drivers and controllers.

The MC33887PFK is a fully integrated two-channel motor driver and controller IC which provides power conversion and control for applications such as motor drives and switch-mode converters. It is designed to operate from a supply voltage range from 4.5V to 36V and can operate up to 8A peak per channel. The MC33887PFK is composed of a microcontroller unit (MCU), several logic drivers, a three-phase current sensing system, a temperature sensing system, a voltage regulator, and a Phase Locked Loop (PLL) used to set the switching frequency.

The microcontroller unit of the MC33887PFK is an 8-bit RISC CPU and is designed to provide higher flexibility in the control system. It interfaces with the control logic to control the external switches and regulate the power output. The MCU also provides multiple features such as protection and fault diagnostic capabilities, as well as PWM and five-quadrant speed control.

The MC33887PFK has six independent logic drivers for the external switches (FETs). These logic drivers provide the necessary control signals to the external systems and can be configured for low-side, high-side, or bridge configurations. The logic drivers also support fault detection and protection, voltage, current and temperature sensing, as well as the ability to operate in three- or four-quadrant speed control.

The MC33887PFK also includes a three-phase current sensing system that helps to provide accurate motor current monitoring and control. This system is composed of three separate linear Hall effect currentsense (LHCS) channels and samples the motor current on each phase up to 250 thousand times per second. The MCU then processes the data from the LHCS channels and uses it to provide precise control of the motor system.

The MC33887PFK also features a voltage regulator and a low-power start-up circuit. The voltage regulator allows the MC33887PFK to operate from a wide input voltage range, while the start-up circuit ensures that the device will start-up even at very low supply voltages.

The MC33887PFK also has a temperature sensing system that helps to protect the device from excessive temperatures and provides temperature monitoring of the motor and power supply. The temperature sensing system consists of two temperature sensors: an internal temperature sensor and an external temperature sensor. The internal temperature sensor is used to monitor the temperature of the motor and the external temperature sensor is used to monitor the temperature of the power supply.

Overall, the MC33887PFK from Freescale is an excellent solution for motor driving and controller applications. Its integrated components and control logic provide an easy and reliable way to control motors while providing power conversion and protection. The integrated temperature sensing system provides a further layer of protection, making the MC33887PFK an ideal solution for robust and reliable power management.

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