L6391D

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Power Management Integrated Circuit (PMIC) is a type of integrated circuit that manages and regulates power within the system-on-a-chip (SoC) and other electronic circuits designed to optimize system efficiency and reduce power consumption. The use of PMICs allows a system to reduce power consumption while maintaining high efficiency, as well as providing additional benefits such as improved reliability, lower overall system costs, and smaller physical size. PMICs are used in a variety of applications, including medical, automotive, aerospace, and industrial applications. While PMICs are used to manage and regulate power, they can also be used to facilitate signal transmission by providing a time delay, or by providing functional isolation. Gate drivers are a type of PMIC used to switch the gate of power MOSFET or IGBT transistors.

The L6391D is a quad, low-side gate driver from STMicroelectronics. This device is capable of driving up to four MOSFETs or IGBTs, with each channel having a peak output current of 4 A and a peak output voltage of 20 V. The L6391D can also be configured as a parallel output driver, providing up to 8 A of peak output current. It features high slew rate, high precision current sensing, built-in protection features, and low quiescent current for applications such as motor drives, power converters, and medical equipment.

The L6391D is designed to interface directly with a power MOSFET or an IGBT module and minimize total system costs. The device can be programmed to provide an adjustable current level corresponding to an acceptable power dissipation, which allows the designer to ensure that the system operates within the specified temperature limits. The device also features an adjustable dead time setting, which helps to avoid cross-conduction between high side and low side switches, which can lead to an unpredictable system behavior.

The L6391D is used in a variety of PMIC gate driver applications. It is well suited for motor drives and other power management applications that require high precision gate control. In motor drives, the device can be used to provide pulse width modulation control of the gate voltage, allowing for precise speed control. It is also used in power management applications such as lighting, industrial automation, solar panel controllers, and motor inverters. In addition, it can also be used in home appliance applications, such as washing machines and dishwashers.

The L6391D has three main modes of operation: single low-side driver mode, double low-side driver mode, and parallel low-side driver mode. In single low-side driver mode, output is provided from the driver’s L1 and G1 pins. In double low-side driver mode, output is provided from the driver’s L2 and G2 pins. In parallel low-side driver mode, output is provided from the driver’s L1 and L2 pins as well as the driver’s G1 and G2 pins. The output from the L1 and G1 pins is referred to as “Active Low-side” output, while the output from L2 and G2 pins is referred to as “Passive Low-side” output.

In single and double low-side driver mode, the driver provides a push-pull output action, driving the motor’s high-side gate to a low voltage and then driving the motor’s low-side gate to a high voltage. The device switches at an adjustable frequency ranging from 1 MHz to 5 MHz. In parallel low-side driver mode, both high and low-side gates are driven to a low voltage. This mode is used to enable synchronous rectification by keeping the low-side gate voltage low, allowing for higher efficiency.

The L6391D also features protection features such as over-voltage protection, over-current protection, under-voltage lockout, and soft-off. The over-voltage protection prevents any damage to the power switching devices from voltage transients, while the over-current protection prevents excessive current from flowing through the system. The under-voltage lockout prevents the driver from attempting to switch on the power MOSFETs or IGBTs in situations where the voltage is too low, while the soft-off discharges the gate capacitances slowly.

The L6391D is a low-cost, high-performance gate driver that has become a popular choice for those looking to implement a PMIC gate driver solution. The device provides precision gate control, while also providing a variety of protection features that ensure that the system operates within safe parameters. Furthermore, the device’s adjustable frequency and adjustable current settings allow the user to tailor the device to their application, making it a versatile and cost-effective solution for a wide range of PMIC gate driver applications.

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