LM2575SX-3.3/NOPB

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LM2575SX-3.3/NOPB Application Field and Working Principle

LM2575SX-3.3/NOPB is a voltage regulator integrated circuit that belongs to Texas Instruments’ wide range of DC-DC switching regulator products. It is a simple 3-pin adjustable positive voltage regulator that helps to convert input voltages ranging from 8 to 40V to a fixed output voltage of 3.3V. LM2575SX-3.3/NOPB can be used as an adjustable voltage regulator or as a fixed voltage regulator when used with a fixed resistor divider.

The main application of LM2575SX-3.3/NOPB is to provide a regulated output voltage from an adjustable or a fixed input voltage, commonly used in the design of low-cost switching power supplies. It is ideal for use in any general purpose power supply applications, such as for mobile and power adapter applications, automotive and industrial applications, involving motors and drives, telecommunications, and point-of-sales equipment.

Working Principle: LM2575SX-3.3/NOPB switching regulator functions by taking an input voltage, converting it to a higher or lower output voltage and controlling the flow of energy between the input voltage source and the load. The basic block diagram and the functional diagram of the LM2575SX-3.3/NOPB switching regulator feature a temperature-compensated internal oscillator for controlling the frequency of the switching cycle. The LM2575SX-3.3/NOPB also includes an error amplifier for providing the reference voltage for the switching circuit. The current limit circuit is set to the output voltage by comparing the error amplifier’s reference voltage with the output voltage, determined by the external resistive divider. When the voltage difference between the two input of the error amplifier exceeds, the error amplifier will output a signal which will increase the switching frequency of the internal oscillator, resulting in a lower output voltage, thus maintaining a regulated output voltage.

The adjustable output current is also based on the same principle, but it is receive the control signal from a potentiometer instead of an error amplifier. The potetiometer is used to control the loop’s gain in order to achieve a desired output current.

Features: a) Wide range of operating temperature range: -40°C to +125°C; b) Operates up to 1.25MHz switching frequency for high efficiency; c) Can provide output power up to 1.5 Watts; d) High tolerance to output voltage accuracy of 2% max error; e) SO-8 package for low thermal resistance; f) Schottky diodes for output protection; g) synchronous or conventional rectification.

In conclusion, LM2575SX-3.3/NOPB switching regulator is an efficient, low-cost and flexible solution for providing adjustable or fixed output power supply solutions. It is suitable for applications involving low-power motors, drives, point-of-sales equipment and telecom applications.

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