LM5020SDX-1

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The LM5020SDX-1 is a high performance synchronous buck controller specifically designed for applications where high conversion efficiency and very low switching losses are desired. It combines a low side current sensing architecture with synchronous down-conversion capabilities to minimize complexity while maximizing performance. The LM5020SDX-1 provides a high level of flexibility in terms of output voltage, current, slew rate and control loop bandwidth, allowing it to be used in a wide variety of applications.

The LM5020SDX-1 is designed for performance in an application field that spans from 3.3V to 30V and operates from a single or multiple distant DC power sources. It features a true differential remote sense and the capability to support multiple output voltage interactions. The device features pre-biased start-up and external voltage input for higher voltage applications. With these features, the LM5020SDX-1 is used to provide high performance, high efficiency DC-DC power conversion for telecom, automotive, industrial, consumer and computing.

Working Principle

At its core, the LM5020SDX-1 has three main components. The first is an internal high-side MOSFET driver, the second is a low-side MOSFET driver, and the third is a synchronous rectifier driver. The way these three components interact to control the output voltage of the device is referred to as pulse width modulation (PWM). The internal MOSFET drivers set the output voltage by adjusting the duty cycle of the PWM signal and thus modulating the average output voltage.

The low side MOSFET driver is responsible for controlling the amount of current into the output capacitor. This current is used to charge the output capacitor and to keep the voltage across it at the desired level. The MOSFET drivers work together to ensure that the output voltage does not drift too far from the desired level. The synchronous rectifier driver is responsible for switching on the MOSFETs at the correct time, as well as for driving the MOSFETs with the correct amount of current.

The LM5020SDX-1 also features a pre-biased start up, which allows the device to be started from any initial voltage level. The pre-biased start up circuit works by first ensuring that the output voltage has settled to the desired value and then triggering the start up circuit. The start up circuit then pulls the output voltage up to the desired value until it reaches the target voltage. The LM5020SDX-1 also supports a wide range of input and output voltages, making it suitable for a variety of applications.

Control Interface

The LM5020SDX-1 features an advanced control interface that enables the device to effectively regulate the voltage across the output capacitor. It also includes a phase-locked loop (PLL) with adjustable control loop bandwidth, enabling the user to select the response speed of the control loop. The PLL also allows the device to easily adjust to changes in load and line conditions. The LM5020SDX-1 also includes a pulse width modulation and a sense amplifier, allowing it to accurately measure the output voltage and then adjust the duty cycle of the internal MOSFET drivers accordingly.

Protection

The LM5020SDX-1 also includes protection features intended to keep the device from being damaged due to over current, over voltage and under voltage conditions. These features are designed to prevent excessive current from flowing through the internal components, and to limit the output voltage to a safe level. The on chip protection mobiles provide robust protection for the device without the need for external components. The device also features an internal compensation loop, which helps to minimize output voltage noise.

Conclusion

The LM5020SDX-1 is a high-performance synchronous buck controller designed for applications that require high efficiency and very low switching losses. It features a true differential remote sense and supports multiple output voltage interactions. The device is designed to work with input voltages ranging from 3.3V to 30V and includes integrated protection features and a pre-biased start up circuit. The LM5020SDX-1 also includes an advanced control interface, a phase-locked loop, and a pulse width modulation circuit, allowing it to be used in a wide variety of applications.

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