LM2575D2T-ADJR4G

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The LM2575D2T-ADJR4G is a monolithic integrated circuit made for switch mode power supply (SMPS). This device offers the ability to easily set up adjustable output voltage from 1.23 V to 37 V, making it suitable for a wide range of applications. The device also has two features to assist the user while creating an application: Frequency foldback control and soft start. With these features, the device is able to increase efficiency and reduce component size, which are always important in most designs.

The LM2575D2T-ADJR4G is an example of a DC-DC switching regulator, and serves as an important component in topologies such as: buck, boost, buck-boost, and inverter. The main features of this device include an input voltage range of 4.5 V to 40 V, adjustable output voltage range of 1.23 V to 37 V, and output current of up to 5 A. The device also features excellent thermal efficiency, with a 5.5 mOhms switching FET, and low external components count. These low parts count not only decreases design complexity but also reduces total cost of production.

The LM2575D2T-ADJR4G is an adjustable step-down power converter, meaning it takes in an input voltage and outputs a lower output voltage. It works by taking electrical energy from its input voltage, and converting it to a lower voltage by switching on and off at specific frequencies. The device is composed of an input capacitor, an inductor, a power switch, a diode to prevent reverse current, and a bunch of over-current protection circuitry.

The switch in the converter is used for generating a pulse width modulated (PWM) signal, which drives the inductor and powers the output. It works by charging the inductor for a set amount of time, and then discharging it into the output capacitor, creating a voltage drop into the output. The frequency of the PWM signal determines the output voltage ripple.

The working frequency of the LM2575D2T-ADJR4G is adjustable, allowing the user to select the most suitable frequency for their application. This frequency is determined by an external Resistor (R1) and a capacitor (C1), connected between the FB (Feedback) and VIN (Input) pins. The frequency is calculated by the equation f = 1 / (2.2 x R1 x C1), and can be maximized to 1000 kHz.

The LM2575D2T-ADJR4G also features frequency foldback control, which reduces the operating frequency of the device to reduce the power dissipation by up to 50%. The frequency foldback is enabled when the output current of the device reaches up to 90% of the maximum output current. This protects the device from thermal damage and ensures consistent performance throughout its power range.

The LM2575D2T-ADJR4G also has a feature called soft start, which gradually increases the output voltage from 0 V to its final set value. The soft start feature reduces the large inrush current that occurs when the device is first powered on, increasing system reliability. It can be enabled or disabled using a simple external capacitor and resistor, connected to the SS (Soft Start) pin and VIN pin.

The LM2575D2T-ADJR4G is an excellent choice of device for applications requiring adjustable output voltage, frequency and current setting capability, as well as adjustable features like frequency foldback control and soft start. Its wide input and output voltage range with excellent thermal efficiency makes it an ideal choice for many design applications.

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