LM5025SD/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Mode PWM Controller

Characteristics: - High voltage start-up - Wide input voltage range - Adjustable switching frequency - Current limit protection - Overvoltage protection - Undervoltage lockout - Soft-start function

Package: SOIC-8

Essence: The LM5025SD/NOPB is a voltage mode PWM controller designed for high-voltage applications. It provides various protection features and adjustable parameters to control the switching frequency and current limit.

Packaging/Quantity: The LM5025SD/NOPB is available in a standard SOIC-8 package. It is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 9V to 100V
• Output Voltage Range: 0.8V to 90V
• Switching Frequency Range: 50kHz to 1MHz
• Maximum Duty Cycle: 100%
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LM5025SD/NOPB has the following pin configuration:

1. VCC: Power supply input
2. COMP: Compensation pin for loop stability
3. FB: Feedback pin for output voltage regulation
4. CS: Current sense pin for current limit protection
5. GND: Ground reference
6. RT/CT: Timing resistor/capacitor connection for switching frequency control
7. SS/TR: Soft-start/Shutdown pin
8. OUT: Output pin

Functional Features

• High voltage start-up: Allows operation from high input voltages.
• Wide input voltage range: Supports a wide range of input voltages, making it suitable for various applications.
• Adjustable switching frequency: Provides flexibility in selecting the desired switching frequency.
• Current limit protection: Protects the circuit from excessive current flow.
• Overvoltage protection: Safeguards against voltage spikes or overvoltage conditions.
• Undervoltage lockout: Prevents operation below a certain input voltage threshold.
• Soft-start function: Gradually ramps up the output voltage during start-up to reduce stress on components.

Advantages and Disadvantages

Advantages: - High voltage capability - Wide input voltage range - Adjustable switching frequency - Comprehensive protection features - Compact SOIC-8 package

Disadvantages: - Limited maximum duty cycle - Requires external components for complete functionality

Working Principles

The LM5025SD/NOPB operates as a voltage mode PWM controller. It compares the feedback voltage (FB) with a reference voltage to regulate the output voltage. The error signal is amplified and used to control the duty cycle of the power switch, which in turn regulates the output voltage. The switching frequency can be adjusted using an external timing resistor and capacitor connected to the RT/CT pin.

Detailed Application Field Plans

The LM5025SD/NOPB is commonly used in various applications, including: 1. Power supplies for industrial equipment 2. Telecom infrastructure 3. Automotive electronics 4. LED lighting systems 5. Renewable energy systems

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the LM5025SD/NOPB include: - LM5020 - LM5030 - UC3845 - LT1241

These models provide comparable features and can be considered as alternatives based on specific application requirements.

In conclusion, the LM5025SD/NOPB is a voltage mode PWM controller designed for high-voltage applications. It offers adjustable parameters, comprehensive protection features, and a wide input voltage range. With its compact package and various applications, it is a versatile choice for power supply designs.