L6743D

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PMIC - Gate Drivers are powerful methods for driving MOSFETs in power electronics applications. Such drivers offer accurate gate drive performance, reduce power losses and improve the efficiency of the power converter. The L6743D is an integrated gate driver providing different gate drive voltages and high peak controlling currents to achieve fast MOSFET switching. The primary applications of the L6743D include AC/DC offline and DC/DC converters, motor drives, welding applications, and battery powered applications. This article examines the features, working principle and application field of the L6743D.

Features of the L6743D

The L6743D is a high fault tolerance, full-bridge gate driver integrated circuit. It offers an innovative behavior, high peak output currents, adjustable dead times and fast rise/fall times for improved performance. The driver is suitable for fast gate turn-on/turn-off driving in high current applications. Key features include:

• Integrated full-bridge, motor gun, gated lock drive circuit
• Up to 700mA peak output current from both high side and low side
• Adjustable dead-time from 0ns to 600ns
• 3.3V to 14V supply voltage range
• Programmable standby current
• Thermal feedback switch protection
• Adjustable propagation delay
• Short-circuit protection
• Under-voltage detection

Working Principle of the L6743D

The working principle of the L6743D is based on two core components: the MOSFETs and the gate driver IC. The MOSFETs act as the main switch, translating input voltage into output voltage, and enabling current flow through the circuit. The gate driver IC is used to maintain the correct working parameters of the MOSFETs; driving the gates with fast switching times and providing accurate safety features.

The driver works by amplifying and controlling the gate-source voltage of the MOSFETs. The higher amplitude and shorter duration of this voltage is what switches the transistors on and off. The driver provides accurate and streamlined control of the voltage, enabling it to perform fast switching, while protecting the device from over-voltage and over-current faults. This control is achieved through a combination of the integrated MOSFETs, the high peak output current, the adjustable dead-time, and the adjustable propagation delay.

The L6743D is also equipped with several innovative protection features. The Short-circuit protection safeguards the device from overheating; while the Thermal feedback switch protection allows the driver to switch off if the temperature of the device exceeds the rated maximum. Additionally, the Under-voltage detection feature monitors the supply voltage and reduces the output voltage for accurate low-voltage protection.

Application Field of the L6743D

The L6743D is an ideal driver for power converter applications such as AC/DC offline and DC/DC converters, motor drives, welding applications, and battery powered applications. These applications require accurate gate drives and fast switching times to ensure proper operation. The L6743D delivers on both counts, with its adjustable dead-times, adjustable propagation delay, and its high fault tolerance.

The L6743D is well-suited for motor drives and welding applications where a high peak current is required and where protection features are essential. The driver allows for fine control of the MOSFETs’ gate voltages, enabling fast switching speeds that can match the current demand. In addition, the driver provides reliable protection from over-voltage, over-current, and short-circuit events, ensuring the device remains safe and effective.

The L6743D is also suitable for AC/DC offline and DC/DC converter applications. These applications require an efficient driver to match the specific requirements of the system. The L6743D provides a solution with its adjustable dead-time, integrated fault protection, and its fast rise/fall times.

Finally, the L6743D is also a great choice for battery powered applications, as its low quiescent current and adjustable standby current reduce power losses and improve efficiency. The driver is equipped with a Thermal feedback switch protection feature to preserve the life of the batteries, while the Under-voltage detection feature ensures the device is safe in low-voltage conditions.

Conclusion

The L6743D is a full-bridge gate driver IC designed for fast switching in power converter applications. The device offers an integrated motor gun design with up to 700mA peak output current from both high side and low side. The driver is equipped with several innovative protection features, such as Short-circuit protection, Thermal feedback switch protection and Under-voltage detection. The primary applications of the L6743D include AC/DC offline and DC/DC converters, motor drives, welding applications and battery powered applications.

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