LM2576-5.0WU

Voltage - Output (Min/Fixed):	5V
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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LM2576-5.0WU Application Field and Working Principle

Introduction to LM2576-5.0WU

LM2576-5.0WU is a DC/DC regulator made by Texas Instruments. It is a step-down switching regulator that can deliver up to 5.0 watts of output power. The device has wide input voltage range and ultra-wide operating temperature range of -40 to +125 degrees C. The LM2576-5.0WU is designed to offer high efficiency and reliability with the added flexibility of adjustable or fixed output voltage.

Application Field of LM2576-5.0WU

The LM2576-5.0WU is widely used in a variety of applications such as consumer electronics, industrial systems, and automotive applications. It is ideal for space-constrained designs where size reduction and high efficiency are of paramount importance. The wide input voltage range and adjustable output voltage make the LM2576-5.0WU suitable for powering devices from a single power source. The high efficiency also makes the device suitable for use as a battery charger as it can provide up to 5 watts of output power.

Working Principle of LM2576-5.0WU

The LM2576-5.0WU is a buck regulator, meaning the input voltage is stepped-down to the desired output. It works by first rectifying the input AC signal and then regulating the rectified DC signal. The LM2576-5.0WU contains a voltage reference, an error amplifier, an oscillator, and a power switch. The voltage reference and error amplifier are used to regulate the output voltage. The output voltage is set by an external resistor divider network. The amplifier senses the output voltage and continually tries to maintain it at the desired value. The oscillator builds the switching frequency, which determines the efficiency and ripple of the output voltage. The higher the frequency, the lower the output ripple and the better the efficiency. The power switch is used to control the output voltage. When the switch is turned on, the input voltage is applied to the inductor. When the switch is turned off, the inductor discharges into the output filter capacitor. This cycle continues until the output voltage reaches the desired value set by the resistor divider.

Conclusion

The LM2576-5.0WU is a high efficiency DC/DC step-down regulator that can provide up to 5.0 watts of output power. It is suitable for a variety of applications from consumer electronics to industrial systems. Its wide input voltage range, adjustable output voltage, and ultra-wide operating temperature make it an ideal choice for space-constrained design. The LM2576-5.0WU works by rectifying the incoming AC signal and regulating the rectified DC signal using a voltage reference, an error amplifier, an oscillator, and a power switch.

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