LM2575BU TR

Product Overview

Category: Voltage Regulator
Use: Step-Down (Buck) Switching Regulator
Characteristics: High Efficiency, Wide Input Voltage Range, Adjustable Output Voltage, Current Limit Protection
Package: TO-263-5 (D2PAK)
Essence: Integrated Circuit (IC)
Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Input Voltage Range: 4.75V to 40V
• Output Voltage Range: 1.23V to 37V
• Output Current: Up to 1A
• Switching Frequency: 52 kHz
• Dropout Voltage: 1.2V typical at 1A load
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LM2575BU TR has a total of five pins:

1. VIN (Pin 1): Input voltage pin.
2. GND (Pin 2): Ground reference pin.
3. FB (Pin 3): Feedback pin for adjusting the output voltage.
4. SW (Pin 4): Switching node pin.
5. VOUT (Pin 5): Output voltage pin.

Functional Features

• Step-down voltage regulation with high efficiency.
• Adjustable output voltage using an external resistor divider network.
• Current limit protection to prevent damage due to excessive load current.
• Thermal shutdown protection to prevent overheating.

Advantages and Disadvantages

Advantages: - High efficiency leads to reduced power dissipation. - Wide input voltage range allows for versatile applications. - Adjustable output voltage provides flexibility. - Current limit protection ensures device safety. - Thermal shutdown protection prevents overheating.

Disadvantages: - Limited output current capability (up to 1A). - Requires external components for proper operation. - Switching frequency may cause electromagnetic interference in sensitive applications.

Working Principles

The LM2575BU TR is a step-down switching regulator that converts a higher input voltage to a lower output voltage. It utilizes a pulse-width modulation (PWM) control scheme to regulate the output voltage. The internal oscillator generates a fixed frequency signal, which controls the duty cycle of the switch. By varying the duty cycle, the average output voltage is adjusted.

When the input voltage exceeds the desired output voltage, the internal switch is turned on, allowing current to flow through the inductor. This energy is stored in the inductor's magnetic field. When the switch is turned off, the energy stored in the inductor is transferred to the output capacitor and load.

Detailed Application Field Plans

The LM2575BU TR is commonly used in various applications, including:

1. Power supplies for industrial equipment.
2. Battery chargers.
3. Automotive electronics.
4. Distributed power systems.
5. LED lighting.

Detailed and Complete Alternative Models

1. LM2596S-ADJ: Similar step-down switching regulator with adjustable output voltage.
2. LM317: Linear voltage regulator with adjustable output voltage.
3. LT1083CP: High current linear voltage regulator with adjustable output voltage.
4. TPS5430: Synchronous step-down switching regulator with adjustable output voltage.

These alternative models offer similar functionality and can be considered as substitutes for the LM2575BU TR in specific applications.

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