L6743

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PMIC (Power Management Integrated Circuit) gate drivers are a kind of components used in electronic systems. It is made of several circuits, mainly consisting of an isolated gate driver, an input buffer and a power make/break switch, that work together to efficiently control power switching for DC/DC converters and other power management circuits. This article discusses the application field and working principle of the L6743 gate driver, which is a part of the STMicroelectronics STDRIVE gate driver family.

The L6743 is a low-side 3-channel gate driver designed to drive N-channel MOSFETs and IGBTs. It features an input buffer for accepting controller signals directly from microcontrollers, DSPs, and/or analog sources. It features internal protection features, such as an over-voltage protection circuit, to ensure safe operation in unpredictable environments. These features make it suitable for a wide range of applications, such as power converters (e.g. AC/DC, DC/DC converters, etc.), motor drives, white goods, fans, and many others.

The L6743 also features several performance enhancements which make it suitable for applications requiring high switching speeds. First, it has a low power consumption in Sleep Mode and a high peak current drive capability that enables it to drive MOSFETs and IGBTs at high speeds. Second, it features short propagation delay with a typical propagation delay of 11 ns. Finally, it has a low Vbat reverse leakage current that allows the gate driver to work even with a poorly regulated Vbat input.

The working principle of the L6743 can be divided into two main parts. The first part is the input buffer, which is used for accepting and conditioning the input signals. It features a push-pull stage with Schmitt trigger capabilities and fast transient response. This ensures that the signal is properly conditioned and that it will be properly interpreted by the logic circuit.

The second part is the logic circuit, which interprets the input signals and controls the output stages. The output stage consists of three channels, each including an adjustable delay circuit and level shifter that guarantees the needed rise and fall times to ensure safe switching of the MOSFETs or IGBTs. In addition, the power make/break switch has an over-voltage protection circuit that protects the circuit if an over-voltage condition is present.

The L6743 gate driver is an efficient and reliable gate driver designed to provide high-speed operation and low power consumption in a wide range of applications. Its input buffer and logic circuit allow it to accept signals directly from microcontrollers, DSPs, or analog sources, while its output stages guarantee the needed rise and fall times to ensure safe switching of the MOSFETs or IGBTs. Finally, its over-voltage protection circuit ensures safe operation even in the presence of an over-voltage condition.

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