Hi Everyone! I welcome you on board. Thank you for clicking this read. In this post today, I’ll walk you through the Introduction to LM2576.
LM2576 is a step-down voltage regulator, also known as a buck converter, mainly employed as a pre-regulator in linear regulators. The customized output version of this buck converter gives you the ability to set the output voltage as you like better. It is available with a remarkable good load and line regulation. Moreover, it is used to drive load under 1A and is available in fixed output voltages with 3.3V, 5V, 12V, and 15V.
I suggest you buckle up and read this post all the way through, as in this post I’ll detail the Introduction to LM2576 covering the datasheet, pinout, features, and applications.
Let’s jump right in.
Introduction to LM2576
- LM2576 is a voltage regulator, also called buck converter, mainly used as a pre-regulator in the linear regulators.
- It is a simplified version of switching power supplies where it houses all functions needed to step down the circuit voltage.
- This buck converter comes with an integrated switch that drives load under 1A.
- LM2576 is available with remarkable load regulation and load line.
- 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. The current is increased during this occurrence of voltage regulation.
- This buck converter comes with a fixed-frequency oscillator of around 52 kHz. It is also available with an in-built frequency compensation method.
- Frequency compensation is used to minimize the oscillation and vibration in the electrical circuit. Resistance-capacitance networks are applied for this frequency method to work.
- Apart from the excellent load and line regulation, this component is available with a manual shutdown option using an external ON/OFF pin.
Before you apply this component to your electrical project, it’s better to go through the datasheet of the component that features the main characteristics of the device. You can download the datasheet of LM2576 by clicking the link below.
The following figure shows the pinout diagram of lm2576.
LM2576 is available with five terminals.
ON/OFF = I = this pin is used to shut down the voltage regulator when the input supply current is decreased to 50uA. The threshold voltage is 1.3V. When the voltage on this pin is set to below the threshold voltage, it will turn on the voltage regulator. When the voltage on this pin goes above the threshold voltage it will turn off the device. And when this pin is connected to the ground or leave it open, it will remove the shutdown feature from the device. Whether you connect this pin to the ground or leave it open, in both cases the regulator remains turned on.
VIN = I = this pin is connected with the bypass capacitor that reduces the voltage transients along with providing the switching current.
Output = O = this terminal behaves like an internal switch where voltage potential goes back and forth between (Vin – Vsat) and -0.5V. The Vout/Vin is this pin duty cycle. The coupling is reduced due to the presence of PCB copper attached to this pin.
Ground = this is the ground pin.
Feedback = I = For the feedback loop, this pin defines the regulated output voltage.
The following are the main features of LM2576.
- Output Voltage available for variable type regulator = 1.23V to 37V
- Internal Oscillator frequency = 52-kHz (this is Fixed Frequency)
- Output Current = 3A
- Used as a switch-mode step down voltage regulator
- Comes with In-built Current Limit and Thermal Shutdown Protection
- Output Voltage available for fixed voltage regulator = 3.3V, 5V, 12V or 15V
- Maximum Input Voltage = 40V
- Available packages = TO-263 & TO-220
The following are the main applications of LM2576.
- Incorporated as a pre-regulator in linear regulator
- Used in On-card switching regulators.
- Employed to drive load under 1A.
- Employed in a simple efficient step-down regulator.
- Used in a positive-to-negative converter.
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