L9915A

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PMIC - Gate Drivers are devices with integrated power switches that are typically used to drive the voltage of the gate of a power MOSFET to turn it on and off. The L9915A is a PMIC - Gate Driver that is used in many applications due to its ability to drive MOSFETs of wide gate-capacitance, its low-voltage operation, and its low-power consumption. This article will focus on the application fields and working principle of the L9915A.

Application Fields

The L9915A is commonly used in a variety of applications, including switching power supplies, DC-DC converters, low-batter regulation, and motor control. In switching power supplies and DC-DC converters, the device can be used to drive a MOSFET in order to control the power delivered to the load. In low-battery regulation circuits, the device can be used to prevent over-discharge of the battery, by controlling the MOSFET that delivers the power from the battery to the load. And in motor control applications, the device can be used to control the speed of the motor by driving MOSFETs that control the voltage delivered to the motor.

Working Principle

The L9915A features a low-voltage, high-current gate driver circuit, designed to drive a wide range of MOSFETs. It has an internal output transistor, which is driven by two input stages: the high-side driver stage, and the low-side driver stage. The high-side driver stage is connected to the MOSFET’s gate, and is responsible for providing the high-side supply voltage to the MOSFET. The low-side driver stage is also connected to the MOSFET’s gate, and is responsible for providing the low-side supply voltage to the MOSFET. The two driver stages are activated according to the control signal, which can be generated from microcontrollers, analog circuits, or digital circuits. When the control signal is high, the high-side driver stage will activate, driving the gate of the MOSFET to a high voltage, turning it on, and delivering power to the load. When the control signal is low, the low-side driver stage will activate, driving the gate of the MOSFET to a low voltage, turning it off, and preventing power from being delivered to the load.

The L9915A also features an over-voltage and over-temperature protection circuit, which protects the MOSFET from potential malfunctions, by preventing the gate voltage from exceeding the maximum voltage, or the temperature from exceeding the maximum temperature. Finally, the device also features a low-power standby mode, which minimizes power consumption when the device is not in use.

Conclusion

In conclusion, the L9915A is a PMIC - Gate Driver that is used in a variety of applications, due to its ability to drive MOSFETs of wide gate-capacitance, its low-voltage operation, and its low-power consumption. It integrates two driver stages, as well as over-voltage and over-temperature protection circuits, and a low-power standby mode.

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