LM2576 is available with two versions: version with fixed output voltage featuring 3.3V, 5V, 12V, & 15V and version with adjustable output that comes with the ability to choose your desired output. It is also known as the DC-to-DC power converter mainly used to step down the voltage from the input supply to its output load. For normal operation, you should connect ~ON/OFF pin to the ground terminal.The current is increased during this occurrence of voltage regulation. When regulator internal switch is off, it offers a path for inductor current. It also provides loop stability.Ī Schottky diode 1N5822 connects across an output pin and L1 inductor. The output capacitor acts as a filter and removes ripples from the output voltage. An input capacitor is required for stability. This circuit is for a fixed voltage regulator which takes an unregulated DC voltage at its pin 1 and then converts it into a +5V regulated voltage which is obtained from pin 2. In this section, we will see examples of how to use LM2576 in fix voltage and adjustable voltage mode. The use of this chip is explained through the circuit given below. If you are looking for a linear buck voltage regulator that can drive 3A loads and provide an output in the range of 1.23V to 37V with an efficiency of 88% then you can use this IC. This feature makes it ideal for designing switch-mode power supplies as it greatly simplifies their design. Due to its convenient use, it is also used as a step-down switching regulator. 
LM2576 is a 3A voltage regulator which provides an excellent line and load regulation. LM1117, CS51411, LM723, LM7912 Where to use 3A Step-Down Voltage Regulator? LM2576 Equivalent and Alternative Options It has an Undervoltage lockout circuit which keeps the input voltage in a range and keeps the regulator off until it comes to a certain threshold level.Protection circuitry includes thermal shutdown and current limit protection.Its output current is specified up to 3A.It can withstand a tolerance of ±4% on output voltage when the input voltage is in the range specified and output load conditions are satisfied, and tolerance of ☑0% on the oscillator frequency.The output voltage can be varied from 1.23V to 37V by connecting external components.
This regulator can provide fixed output voltages of 3.3, 5, 12 and 15 volts.Input voltage can be applied up to 40V and up to 60V for HV versions.It is a fixed frequency voltage regulator having an internal oscillator of frequency 52kHz.To disable the regulator, connect this pin to HIGH logic. Connect it to the ground to enable the voltage regulator.
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