LM2575S-ADJ

Voltage - Output (Min/Fixed):	1.23V
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):	37V
Series:	SIMPLE SWITCHER®
Voltage - Input (Max):	40V
Voltage - Input (Min):	4V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Not For New Designs
Packaging:	Tube

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LM2575S-ADJ Application Field and Working Principle

The LM2575S-ADJ is a monolithic adjustable switching regulator from Texas Instruments that features high efficiency, low ripple/noise, and low heat dissipation. Its wide range of operating characteristics makes it suitable for a variety of applications such as DC-DC converters, LED drivers, and functional power supplies.This DC-DC switching regulator is an ideal solution for systems that require conversion of a single-rail input voltage to a different single-rail output voltage. It has a wide input voltage range and a wide output range of 1.2 V to 57 V. It also provides an adjustable output voltage for the output range to accommodate different power supply requirements.The LM2575S-ADJ has a built-in current mode PWM control and integrated protection functions such as over-temperature protection, over-voltage protection, and current limit protection. This makes it ideal for use in high-temperature and safetly critical applications.

Working Principle

The LM2575S-ADJ is a feedback-regulated buck converter that converts a single-rail input voltage to a regulated DC output voltage. It uses the principle of Pulse-width Modulation (PWM) to achieve voltage regulation.PWM modulates the duty cycle of the on/off switch. A PWM controller controls the duty cycle by comparing the actual output voltage to the desired voltage set by the user, a process referred to as "closed-loop feedback."When the sensor detects an output voltage that is higher than the desired voltage, the controller reduces the duty cycle of the switch, reducing the amount of energy to the output. Conversely, when the sensor detects an output voltage that is lower than the desired voltage, the controller increases the duty cycle of the switch, increasing the amount of energy to the output.This process allows the LM2575S-ADJ to maintain a regulated voltage. It also has integrated protection functions such as over-voltage protection and current-limit protection to ensure the safe operation of the regulator, even under extreme conditions.

Applications

The LM2575S-ADJ is suitable for a wide range of applications, such as DC-DC converters, LED drivers, and functional power supplies. Its low ripple/noise and high efficiency makes it an ideal choice for applications that require a high level of performance.The LM2575S-ADJ is particularly well-suited for power delivery applications such as computer systems, wireless applications, and industrial equipment. Its adjustable output voltage makes it a great choice for powering sensitive electronic devices, such as ICs, RFID tags and microcontrollers.The LM2575S-ADJ is also well-suited for automotive applications, such as lighting and electric power steering systems. It is highly reliable and has protection functions to ensure safety and reliability in these applications.Overall, the LM2575S-ADJ is an ideal solution for a wide range of applications. Its wide input voltage range and adjustable output voltage make it a great choice for applications that require high performance and reliability.

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