LM2575HVM-15/NOPB

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The LM2575HVM-15/NOPB is a monolithic integrated circuit and is a step-down DC-DC voltage regulator which operates with an efficiency of up to 95%. It offers wide input voltage range of 4.5V to 40V and provides a fixed output voltage of 15V. This switching regulator is specially designed for automotive applications and provides a range of protection features to ensure reliability. This application note outlines the important features, system benefits and the working principle of the LM2575HVM-15/NOPB.

Features

The LM2575HVM-15/NOPB is a monolithic integrated circuit that combines a wide input voltage range with protection features and a low quiescent current. It offers a wide input voltage range of 4.5V to 40V and a fixed output voltage of 15V with efficiency up to 95%. The device is specially designed for automotive applications and when used with a minimum number of external parts it results in a guaranteed performance and reliability. The LM257HVM-15/NOPB is a regulated mode device that uses the Pulse Width Modulation (PWM) to generate an output voltage. The device has a wide operating frequency range of 100 kHz to 1.2 MHz and it can be programmed by an external resistor.

The LM257HVM-15/NOPB offers protection features that includes short-circuit protection, overtemperature shutdown, undervoltage lockout and inrush current protection, as well as current limiting and overvoltage protection. In addition, it features an enable/disable control and an automatic transition from Pulse Frequency Modulation (PFM) to pulse-width modulation (PWM) for optimal efficiency.

System Benefits

The LM2575HVM-15/NOPB is designed for automotive applications and offers a wide input voltage range of 4.5V to 40V. This device is made with quality components and offers protection features that guarantee reliability and performance. Due to its low quiescent current, low EMI and fast transient response, the LM2575HVM-15/NOPB is well-suited for automotive systems running on 12V, 24V, and 48V. It offers up to 95% efficiency, which helps to reduce the power losses and increase the system’s efficiency. This switching regulator can also be used in power conversion and battery charging applications, as well as LED light source designs.

Working Principle

The LM2575HVM-15/NOPB is a pulse width modulation (PWM) switching regulator. This device uses two switches, an input filter and an output filter to regulate the output voltage. The switches are known as the high-side switch, Q1 and the low-side switch, Q2. When the high-side switch, Q1 is turned on, current flows from the input, Vin to the output, Vo, and it continues to flow until the low-side switch, Q2 is turned on. During this period, the charge is stored in the output capacitor, COUT and the output voltage is regulated to a certain value.

The control circuit senses the output voltage and compares it with the reference voltage. If the output voltage is lower than the reference voltage, the high-side switch, Q1, is turned on and the current flows from the input to the output. On the other hand, if the output voltage is higher than the reference voltage, the low-side switch, Q2 is turned on and the current flows from the output back to the input.

The frequency of the switching between the high-side and the low-side switch is determined by an oscillator and it can be adjusted by an external resistor, RT. This switching frequency is generally set between 100 kHz and 1.2 MHz. Moreover, the duty cycle of the switching can be changed by a pulse width modulator (PWM). The PWM changes the duty cycle to maintain the output voltage and maximize the efficiency.

The LM2575HVM-15/NOPB is a high-performance step-down DC-DC voltage regulator. It offers a wide input voltage range of 4.5V to 40V and provides a fixed output voltage of 15V. It features protection features, a low quiescent current, 97% efficiency at full load, and a wide frequency range of 100 kHz to 1.2 MHz. It is specially designed for automotive applications and is an ideal choice for automotive systems running on 12V, 24V, and 48V.

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