LM2575SX-12

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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LM2575SX-12 Application Field and Working Principle

The LM2575SX-12 is a component that is part of the available PMIC (Power Management Integrated Circuit) - Voltage Regulators - DC DC Switching Regulators. It is a comprehensive monolithic device containing all circuitry required to provide a regulated voltage or current output and is capable of providing up to 1.5A output current. The LM2575SX-12 also includes an oscillator, an on-shift control, an Error Amp, a PWM (Pulse Width Modulation) comparator, a 5V reference, a logic output disable, and an under-voltage lockout (UVLO) circuit, all combined into a single IC.The LM2575SX-12 is ideally suited for a wide range of DC/DC applications such as switching power supplies, battery chargers, voltage regulators, and electronic lighting systems. It is designed to operate over a wide input voltage range, from 4.5V to 18V for the 12V output version. It also has a wide operating temperature range of -40°C to +125°C with the maximum junction temperature of +150°C.

Working Principle

The device has two basic functions, namely to convert a high input DC voltage to a regulated lower output DC voltage and to provide current limiting and thermal shutdown protection. The switching is achieved by a PWM (Pulse Width Modulation) control when a gate driver controls the turn on and off of a power switch.The operation of the device begins with a regulated 5V reference voltage (Vo) input to the Error Amplifier. This is a Closed Loop Error Amplifier used for loop control output voltage regulation. The Error Amp signals this error signal to the microprocessor for signal processing. The microprocessor signals the PWM (Pulse Width Modulation) comparator to control the internal gate drive signal, which is then amplified by the external transistors to drive the output power switch.Once the output current exceeds the preset limit, the current limit detection circuit is triggered, to reduce the current limit by reducing the duty cycle. Moreover, if the device temperature has increased beyond a safe limit, theThermal Shutdown circuit will be triggered, and the device will shut off the power switch to prevent any damage due to over temperatures.

Advantages

One of the main advantages of the LM2575SX-12 is that only one external resistor and an inductor is required to construct a control loop and to filter the output ripple. This makes it very ideal for applications where space and cost are the main concern.The device is also very efficient due to its low external parts count and its 0.6V dropout voltage, which reduces power losses. This makes the LM2575SX-12 very suitable for applications where regulated voltage is required for long periods, such as battery powered devices.The device also has a wide input voltage range of 4.5V to 18V, making it ideal for a wide range of DC/DC applications. This wide input voltage range also eliminates the need for a stepdown transformer for most DC/DC applications.The LM2575SX-12 also has built-in protection features such as current limit, short-circuit protection, and thermal shutdown. The output ripple is also kept to a minimum and the device is capable of providing up to 1.5A output current, making it very suitable for applications such as voltage regulators and electronic lighting systems.

Conclusion

The LM2575SX-12 is a component that is part of the available PMIC (Power Management Integrated Circuit) - Voltage Regulators - DC DC Switching Regulators. It is a comprehensive monolithic device containing all circuitry required to provide a regulated voltage or current output and is capable of providing up to 1.5A output current.The LM2575SX-12 is ideally suited for a wide range of DC/DC applications such as switching power supplies, battery chargers, voltage regulators, and electronic lighting systems. It is designed to operate over a wide input voltage range, from 4.5V to 18V for the 12V output version. It also has a wide operating temperature range of -40°C to +125°C with the maximum junction temperature of +150°C.The LM2575SX-12 has various advantages including low external parts count and 0.6V dropout voltage, which reduces power losses and provides a regulated output. It also has a wide input voltage range, built-in protection features, and is capable of providing up to 1.5A output current. This makes it very suitable for a wide range of DC/DC applications.

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