LM2575HVS-12/NOPB

Introduction

The LM2575HVS is a monolithic step-down switching regulator designed for efficient and easy power conversion and/or voltage conversion applications. It is designed for use with a wide range of input voltage sources, and has a wide output range that can be adjusted using external components. The LM2575HVS is able to convert input voltages up to 40V and can provide up to 1A output current.

Application Field

The LM2575HVS can be used in many power conversion and/or voltage conversion applications such as DC-to-DC converter, battery charger, voltage regulator, or motor controller. It is ideal for use in power electronics applications operating off a wide input voltage source, such as off-grid power systems or automotive applications. Additionally, it can be used in battery backup systems and power tools, and is well suited for applications where high efficiency and long term reliability are critical.

Working Principle

The LM2575HVS is an integrated circuit with an internal oscillator that operates at up to 500kHz and internally limited to prevent device damage with high currents. It adjusts its duty cycle according to the current load and input voltage to maintain a steady output voltage, and the output voltage can be adjusted using external components. Internally, the regulator operates in a fixed frequency PWM (pulse width modulation) mode with synchronous switching of the power MOSFET to meet the tight load and transient response times. The LM2575HVS uses an oscillator with a frequency of up to 500kHz, higher than the majority of similar components, for improved efficiency and reduced noise.

The LM2575HVS provides two low side MOSFETs with integrated current sensing. The two MOSFETs are controlled to keep the current flow constant in certain circumstances, such as when the output voltage is low or the load is large, and prevent inefficient current flow. The MOSFETs are also protected against overvoltage and over temperature, providing additional safety. Additionally, the LM2575HVS provides a thermal shutdown in the event of an over temperature condition.

The LM2575HVS is designed for use with a range of input and output voltages, with a wide input voltage range of from 5V up to 40V and an adjustable output voltage of up to 37V. The output voltage can be adjusted over the full range of input voltage using an external resistor divider. The output current capacity is up to 1A, with a maximum power dissipation of 30W.

Conclusion

The LM2575HVS is a versatile and reliable power and voltage converter intended for use in a wide range of applications. With its wide input and output voltage range, high efficiency and low noise, it is well suited for applications where long term reliability and high efficiency are critical.