LM2575SX-12/NOPB

Voltage - Output (Min/Fixed):	12V
Base Part Number:	LM2575
Supplier Device Package:	DDPAK/TO-263-5
Package / Case:	TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	52kHz
Current - Output:	1A
Voltage - Output (Max):	--
Series:	SIMPLE SWITCHER®
Voltage - Input (Max):	40V
Voltage - Input (Min):	4V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The LM2575SX-12/NOPB is a high efficiency voltage regulator, specifically designed to convert standard input voltage down to the lower output voltages. This device is part of the family of “switching regulators” or “switching DC/DC converters”. It provides a wide range of features such as over temperature protection, output power control, single-wireenable, supply voltages up to 30V, output voltages as low as 0.8V. This device can also be configured to operate in a current-limiting application with minimal external components, making it an ideal solution for low voltage noise sensitive applications.

Application Fields

The LM2575SX-12/NOPB is suitable for various applications such as small portable power sources, USB power supplies, white goods appliances, point-of-load (POL) regulation, distributed power architectures, on-board regulation, local regulation, intelligent battery charging, and industrial process control. It is well suited for secondary-side power systems, where the bar from point-of-regulator to its loads can be as long as 20 cm, and as many as thirty capacitors can be located in its environment. It also provides adaptive synchronization to an external clock for a wide array of POL applications.In addition, the LM2575SX-12/NOPB is designed with a low quiescent current and can provide excellent performance in battery-powered systems. It is also capable of supplying up to 750 mA of load current and can deliver high efficiency that exceeds 90% over the full load current range.

Architecture

The LM2575SX-12/NOPB consists of four main components: a primary side controller with a power switch, an inductor, an output diode, and an adjustable output voltage regulator.The primary side controller is an integrated control logic circuit that contains several protection features such as programmable over temperature, over current, and over voltage protection. It also contains the necessary control to implement the switch-mode voltage conversion. The switch-mode power conversion topology allows for a wide range of output voltages and currents while maintaining high efficiency. The inductor and output diode form a small “DC buck” converter that can be used to step down the input voltage and then create the output voltage. The output voltage regulator is used to ensure the output voltage is stable and is adjustable over a wide range.

Working Principle

The LM2575SX-12/NOPB is a step-down (buck) regulator. The controller turns the power switch on, connecting the input voltage to the buck converter’s primary winding. The current stored in the primary winding increases linearly over time, creating a magnetic field. When the switch is turned off, the stored energy is transferred from the primary winding to the secondary winding, through the diode.The controller then monitors the output voltage and adjusts the duty cycle of the switch accordingly in order to maintain the output voltage within the required parameters. The amount of energy that is transferred depends on the duty cycle of the switch, the inductor’s magnetic characteristics, and the diode\'s voltage drop. With this basic structure, the LM2575SX-12/NOPB can provide fixed output voltage or variable output voltage through the use of the output voltage regulator.

Conclusion

The LM2575SX-12/NOPB is an ideal solution for applications requiring low voltage noise sensitive regulators. It provides high efficiency and allows for use of a wide range of input voltages. It is also capable of providing a current-limiting application with minimal external components and adaptive synchronization to external clock signals. The LM2575SX-12/NOPB is a complete, cost-effective solution for many low voltage power system applications.

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