LM5045MH/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Mode PWM Controller

Characteristics: - High voltage input range - Wide duty cycle range - Adjustable switching frequency - Current limit protection - Overvoltage protection - Undervoltage lockout - Soft-start capability

Package: PowerPAD-HTSSOP-20

Essence: The LM5045MH/NOPB is a high-performance voltage mode PWM controller designed for power converters in various applications.

Packaging/Quantity: The LM5045MH/NOPB is available in a PowerPAD-HTSSOP-20 package. It is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 4.5V to 100V
• Duty Cycle Range: 0% to 100%
• Switching Frequency Range: 50kHz to 1MHz
• Maximum Output Current: 2A
• Operating Temperature Range: -40°C to 125°C

Pin Configuration

The LM5045MH/NOPB has the following pin configuration:

1. COMP: Compensation pin
2. SS/TR: Soft-start/Tracking pin
3. RT/CT: Timing resistor/capacitor pin
4. VREF: Reference voltage pin
5. FB: Feedback pin
6. CS: Current sense pin
7. GND: Ground pin
8. DRVH: High-side gate driver output
9. DRVL: Low-side gate driver output
10. VCC: Supply voltage pin
11. UVLO: Undervoltage lockout pin
12. OVLO: Overvoltage lockout pin
13. EN: Enable pin
14. SYNC: Synchronization pin
15. SS/TR2: Second soft-start/tracking pin
16. RT/CT2: Second timing resistor/capacitor pin
17. VCC2: Second supply voltage pin
18. DRVH2: Second high-side gate driver output
19. DRVL2: Second low-side gate driver output
20. NC: No connection

Functional Features

• Voltage mode control with adjustable duty cycle and switching frequency
• Current limit protection to prevent excessive load current
• Overvoltage protection to safeguard against voltage spikes
• Undervoltage lockout to ensure proper operation at low input voltages
• Soft-start capability for smooth startup and reduced stress on components
• Synchronization option for multiple converters operating in parallel

Advantages and Disadvantages

Advantages: - Wide input voltage range allows for versatile applications - Adjustable duty cycle and switching frequency provide flexibility in power converter design - Comprehensive protection features enhance system reliability - Soft-start capability reduces inrush current during startup

Disadvantages: - Limited maximum output current of 2A may not be suitable for high-power applications - PowerPAD-HTSSOP-20 package may require careful PCB layout considerations

Working Principles

The LM5045MH/NOPB operates as a voltage mode PWM controller, regulating the output voltage of a power converter by adjusting the duty cycle of the switching signal. It compares the feedback voltage from the output with a reference voltage and adjusts the duty cycle accordingly to maintain the desired output voltage.

The controller also incorporates various protection features such as current limit protection, overvoltage protection, and undervoltage lockout to ensure safe and reliable operation of the power converter.

Detailed Application Field Plans

The LM5045MH/NOPB is commonly used in the following application fields:

1. Power supplies for industrial equipment
2. Telecom and networking systems
3. Automotive electronics
4. Renewable energy systems
5. LED lighting applications

Detailed and Complete Alternative Models

Some alternative models to the LM5045MH/NOPB include:

1. LM5035: Similar voltage mode PWM controller with lower input voltage range
2. LM5113: High-speed dual gate driver for power converters
3. LM25066: Multi-channel current/voltage monitor and protector

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

In conclusion, the LM5045MH/NOPB is a versatile voltage mode PWM controller that offers a wide input voltage range, adjustable duty cycle, and comprehensive protection features. Its compact PowerPAD-HTSSOP-20 package makes it suitable for various applications in industrial, telecom, automotive, renewable energy, and LED lighting fields. Designers can also consider alternative models based on their specific needs.