UC2714D

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PMIC - Gate Drivers is a class of integrated circuit devices used for connecting digital integrated circuits to other electronic circuits. The Texas Instruments UC2714D is a PMIC - Gate Driver used to control the gate current in switching power supplies, eliminating the need for an external gate resistor. In this article, we will discuss the application field and working principle of the UC2714D.

Application Field

The UC2714D is used in switching power supplies, where it can control the gate current of a power field-effect transistor (FET). This circuit is often used in applications that involve a high switching frequency, such as computer monitors and power supplies. This is because the UC2714D can accurately control the gate current, allowing for smoother and more efficient switching. Additionally, the UC2714D is designed to work with small physical dimensions and low power consumption.

Working Principle

The UC2714D is a monolithic semiconductor that has two outputs, one for the power FET gate drive and the other for an auxiliary FET. It works by supplying a constant-voltage gate drive signal to the power FET gate to ensure a constant current flow. In addition, the UC2714D can supply an adjustable gate drive to the auxiliary FET, which is used to control the speed of the switching action.

The UC2714D also features a slew-rate limiting circuit. This circuit uses an internal reference voltage to set the upper and lower threshold voltages of the gate drive signal. Depending on the external capacitors connected, the slew-rate limit can be adjusted to limit the maximum rise and fall times for the power FET gate. This prevents the power FET from switching too quickly and thus avoiding problems such as noise, ringing, and false triggering.

The UC2714D also features an adaptive deadtime control, which is used to minimize losses in the power FET. This timer is set to adjust the deadtime between the power FET and the auxiliary FET. As the load current changes, the deadtime is adjusted to minimize losses but keeping the switching time within the rated time of the power FET.

Conclusion

The Texas Instruments UC2714D is a PMIC - Gate Driver used to control the gate current in switching power supplies. It features an adjustable gate drive, slew-rate limiting circuit, and an adaptive deadtime control to ensure efficient and smooth switching. These features make it ideal for applications that require a high switching frequency, such as computer monitors and power supplies.

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