LM2576HVSX-3.3/NOPB

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Introduction:

LM2576HVSX-3.3/NOPB is a 3.3V high-power step-down voltage regulator. It is a monolithic integrated circuit, designed to offer higher efficiency, and greater flexibility than traditional linear regulators. It is widely used in Power Management and Voltage Regulation applications, as it is capable of taking input voltages as high as 40V and stabilizing them within a narrow range, typically 0.8V-5.5V. This device is also capable of offering fast transient response times and low noise operation even at higher currents (up to 3A).

Application Field:

The LM2576HVSX-3.3/NOPB is a DC-DC switching regulator suitable for a wide range of applications. It is a popular solution in automotive, medical, industrial and consumer electronics markets, and it is often used to provide regulated outputs from sources such as: batteries, solar panels, mains voltage power supplies, AC-DC power converters, and DC-DC converters. Typical applications include: instrumentation systems, automotive audio systems, power amplifiers, power supply design, and battery backed-up systems.

The LM2576HVSX-3.3/NOPB is ideal for use in a wide range of applications, such as regulating the supply voltage to microprocessors, LDOs, and other embedded systems where a low drop out feature is needed. It is also highly suitable for use in motor control applications, due to its high efficiency and fast transient response time.

Working Principle:

The LM2576HVSX-3.3/NOPB works by regulating the input voltage to a required fixed output voltage by means of pulse-width modulation (PWM). The integrated circuit (IC) contains two oscillators, one for the fixed frequency PWM and the other for the sleep mode. The device also contains an on-chip green-mode PWM controller, with a built-in oscillator and a single resistor for programming frequency and PWM duty cycle. The chip also contains a loop compensator with programmable gain, an adjustable over-voltage protection circuit and low drop-out voltage.

The LM2576HVSX-3.3/NOPB is a synchronous rectifier, which means it uses two switches, the low-side and the high-side, to alternately connect the input and output supplies. As the input voltage increases, more current is transferred and the output voltage decreases. When the output voltage reaches a minimum level (set by the feedback loop), the high-side switch is turned off. When the voltage of the input supply is low enough, the low-side switch is turned on.

The operating frequency is adjustable though the resistor, which is connected to the PWM controller. The maximum frequency depends on the output current, the input voltage and the input and output voltage differences. The device can support up to 3A of output current and has a maximum switching frequency of 1.5MHz.

Conclusion:

The LM2576HVSX-3.3/NOPB is an advanced 3.3V high-power step-down voltage regulator, suitable for a wide range of applications. To achieve the desired output voltage and current, the device uses PWM to regulate the input voltage to a fixed output voltage. The LM2576HVSX-3.3/NOPB contains integrated features such as green-mode PWM, adjustable over-voltage protection, on-chip oscillator and adjustable frequency, loop compensator, and low drop-out voltage, making this device an ideal solution for power management and voltage regulation applications.

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