LM2575BN

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - High efficiency - Wide input voltage range - Adjustable output voltage - Low standby current - Thermal shutdown protection

Package: DIP-8 (Dual In-line Package)

Essence: The LM2575BN is a step-down switching voltage regulator IC that provides a regulated output voltage from a higher input voltage source.

Packaging/Quantity: The LM2575BN is typically sold in reels or tubes, with a quantity of 50 units per reel/tube.

Specifications

• Input Voltage Range: 4.5V to 40V
• Output Voltage Range: 1.23V to 37V
• Output Current: Up to 1A
• Switching Frequency: 52 kHz
• Efficiency: Up to 90%
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LM2575BN has 8 pins arranged as follows:

```

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| | --| Vin GND |-- Pin 1: Ground (GND) --| Vout NC |-- Pin 2: Not Connected (NC) --| FB NC |-- Pin 3: Not Connected (NC) --| ON/OFF NC |-- Pin 4: Not Connected (NC) --| NC NC |-- Pin 5: Not Connected (NC) --| NC NC |-- Pin 6: Not Connected (NC) --| NC NC |-- Pin 7: Not Connected (NC) --| NC NC |-- Pin 8: Not Connected (NC) |___________| ```

Functional Features

• Step-down voltage regulation: Converts a higher input voltage to a lower, regulated output voltage.
• Adjustable output voltage: The output voltage can be adjusted using an external resistor divider network.
• Thermal shutdown protection: Automatically shuts down the regulator if the temperature exceeds a certain threshold, preventing damage to the IC.

Advantages and Disadvantages

Advantages: - High efficiency results in less power dissipation and longer battery life. - Wide input voltage range allows for flexibility in various applications. - Adjustable output voltage provides versatility for different requirements. - Low standby current minimizes power consumption during idle periods. - Thermal shutdown protection ensures the safety of the IC.

Disadvantages: - Limited output current capacity (up to 1A) may not be suitable for high-power applications. - Switching frequency of 52 kHz may introduce audible noise in sensitive audio applications.

Working Principles

The LM2575BN operates as a step-down switching voltage regulator. It uses a pulse-width modulation (PWM) control scheme to regulate the output voltage. The input voltage is chopped at a high frequency by an internal switch, and then filtered and smoothed to provide a stable output voltage. The duty cycle of the internal switch is controlled to maintain the desired output voltage.

Detailed Application Field Plans

The LM2575BN is commonly used in various applications, including: - Power supplies for electronic devices - Battery chargers - Automotive electronics - Industrial control systems - LED lighting

Detailed and Complete Alternative Models

Some alternative models to the LM2575BN include: - LM2574: Similar functionality but with a lower output current capacity. - LM2596: Higher output current capacity and wider input voltage range. - LM317: Linear voltage regulator with adjustable output voltage.

These alternative models offer different specifications and features, allowing users to choose the most suitable option for their specific application needs.

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