L6227Q

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The L6227Q is an integrated motor driver and controller designed for switching power MOSFETs, offering intelligent bridge control in a robust and space saving package. This application note explains the key features, application background and working principles of the L6227Q.

Key Features

The key features of the L6227Q are that it has integrated low-side and high-side drivers that are capable of driving up to 200V at 4.5A each, with a maximum efficiency of 98%. It integrates protection features such as over-temperature, over-current & short-circuit protection, and includes an integrated charge pump to provide flyback of the gate drivers. It has a selectable PWM Interface and an integrated bridge current control loop with a 6-series precision resistor programmable current sense circuit.

Application Background

The L6227Q is designed primarily for switching power MOSFETs or IGBTs in high-power applications such as solar inverters, AC/DC and DC/DC converters, and motor drives. It is also suitable for many other applications requiring intelligent bridge control, efficient power conversion and high accuracy sensing.

Working Principle

The L6227Q is an integrated power MOSFET driver and controller. It has four main components: the gate drivers, the gate current control loop, the protection circuits and the PWM interface. The gate drivers are responsible for controlling the MOSFETs, while the gate current control loop monitors the load and adjusts the gate drive currents accordingly. The protection circuits protect the devices against over-temperature, over-current and short-circuit conditions, while the PWM interface allows it to be connected to any external PWM signal generator.

The L6227Q operates by controlling the gate voltage of the MOSFETs. When a PWM signal is applied to the PWM input, the integrated charge pump is activated and produces a high voltage, which is applied to the gates of the MOSFETs. The integrated current sense resistor measures the current on the high side MOSFET and adjusts the gate drive current depending on the load current. The protection circuits protect the devices against any over-temperature, over-current or short-circuit conditions.

Overall, the L6227Q is a robust and space-saving device, ideal for high-power applications requiring intelligent bridge control and high accuracy sensing. It includes a comprehensive set of features and integrated protection circuits, allowing it to be used in both noisy and harsh environments.

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