LM2576-12WU

Voltage - Output (Min/Fixed):	12V
Base Part Number:	LM2576
Supplier Device Package:	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:	3A
Voltage - Output (Max):	--
Series:	--
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:	Bulk

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LM2576-12WU Application Field and Working Principle

The LM2576 series are monolithic integrated circuits ideal for a wide range of power management applications including on-board DC-DC converters, polarity converter circuit, step-up/step-down voltage converter circuit and so on. LM2576 series switching regulator is a high voltage buck regulator with excellent efficiency and low operating temperature. The series have outstanding performance, extensive protection features and a wide input voltage range.

Features

The key features of the LM2576 series include:

• Wide input range up to 40V
• Output voltage range up to 29V
• High output power up to 12W
• High efficiency up to 82%
• Internal soft-start circuit
• Current limit protection
• thermal shutdown protection
• Internal compensation
• Output voltage adjustment

Applications

LM2576-12WU is a high performance buck switching regulator integrated circuit with an extensive range of applications. This series has a wide input voltage range of 4V to 40V, making it suitable for various power sources. The ultra-wide input ensures that the LM2576 series can be used in multiple applications such as dc−dc converter, polarity converter circuit, step-up/step-down voltage regulator and so on.The high output power of up to 12W makes the LM2576 series ideal for driving high-power appliances such as air conditioners, fans and motors. The high efficiency of up to 82% helps to keep the operating temperature low while also conserving energy. The LM2576 series also features a built-in soft-start circuit, current limit protection and thermal shutdown protection for increased safety and reliability. The output voltage can be adjusted via external resistors for application flexibility.

Working Principle

The LM2576 series switching regulator works on a buck topology, which is a simple configuration that utilizes two active elements: a MOSFET and a diode. The diode serves as a pass element while the MOSFET serves as a switch. The MOSFET is activated and deactivated by switching between the two states of a single voltage controlled PWM signal, allowing it to control the current flowing through the MOSFET. In normal operation, the PWM signal is switched between the two states at a certain frequency, which is determined by the external components in the feedback loop. When the MOSFET is switched on, the voltage is regulated by the external capacitors and resistors. When the MOSFET is switched off, the diode allows the current to pass, maintaining the voltage across the MOSFET and providing the necessary energy for the load. Since the duty cycle of the PWM signal can be changed, the output voltage can be adjusted accordingly.

Conclusion

The LM2576-12WU is a high performance buck switching regulator integrated circuit and an excellent choice for a wide range of power management applications. It has a wide input voltage range of 4V to 40V and can provide an output voltage up to 29V with a maximum output power of 12W. The series also features excellent efficiency of up to 82%, making it highly energy efficient. The LM2576-12WU also has additional protection features such as current limit protection and thermal shutdown protection for increased safety and reliability. The output voltage can also be adjusted via external resistors for application flexibility. With its wide range of features, the LM2576-12WU is a valuable choice for numerous power management applications.

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