LM5035ASQ/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 capability

Package: 16-pin LLP (Leadless Leadframe Package)

Essence: The LM5035ASQ/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 LM5035ASQ/NOPB is available in a 16-pin LLP package. It is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 4.5V to 100V
• Output Voltage Range: 0.8V to 85V
• Switching Frequency Range: 50kHz to 1MHz
• Maximum Duty Cycle: 90%
• Operating Temperature Range: -40°C to +125°C
• Quiescent Current: 2.5mA

Pin Configuration

The LM5035ASQ/NOPB has the following pin configuration:

1. VCC: Power supply input
2. COMP: Error amplifier output
3. FB: Feedback input
4. CS: Current sense input
5. SS/TR: Soft-start/Tracking input
6. RT/CT: Oscillator timing components
7. GND: Ground
8. DRVH: High-side gate driver output
9. DRVL: Low-side gate driver output
10. SYNC: Synchronization input
11. UVLO: Undervoltage lockout input
12. OVP: Overvoltage protection input
13. EN: Enable input
14. SS/TR: Soft-start/Tracking input
15. VCC: Power supply input
16. NC: No connection

Functional Features

• High voltage start-up: The LM5035ASQ/NOPB can operate from a wide input voltage range, making it suitable for various applications.
• Adjustable switching frequency: The switching frequency can be adjusted to optimize efficiency and minimize EMI.
• Current limit protection: The controller incorporates a current sense input to protect the system from excessive current.
• Overvoltage protection: An overvoltage protection input ensures that the output voltage does not exceed a certain threshold.
• Undervoltage lockout: The undervoltage lockout feature prevents the controller from operating when the input voltage falls below a specified level.
• Soft-start capability: The soft-start function gradually increases the output voltage during start-up, reducing stress on the components.

Advantages and Disadvantages

Advantages: - Wide input voltage range allows for versatile applications - Adjustable switching frequency for optimization - Comprehensive protection features enhance system reliability - Soft-start capability reduces stress on components

Disadvantages: - Limited maximum duty cycle of 90% - Quiescent current of 2.5mA may impact power efficiency in low-power applications

Working Principles

The LM5035ASQ/NOPB operates as a voltage mode PWM controller. It compares the feedback voltage with a reference voltage and adjusts the duty cycle of the output waveform accordingly. By controlling the duty cycle, the controller regulates the output voltage. The switching frequency can be adjusted using external timing components connected to the RT/CT pins.

Detailed Application Field Plans

The LM5035ASQ/NOPB is commonly used in the following applications:

1. Power supplies for industrial equipment
2. Telecom and networking systems
3. LED lighting drivers
4. Battery charging systems
5. Motor control circuits

Detailed and Complete Alternative Models

1. LM5034ASQ/NOPB: Similar to LM5035ASQ/NOPB, but with a different pin configuration.
2. LM5036ASQ/NOPB: Offers additional features such as adjustable slope compensation and external synchronization.
3. LM5037ASQ/NOPB: Designed for high voltage flyback converters with synchronous rectification.

These alternative models provide similar functionality and can be considered as substitutes for the LM5035ASQ/NOPB in specific applications.

In conclusion, the LM5035ASQ/NOPB is a voltage mode PWM controller that offers a wide input voltage range, adjustable switching frequency, and comprehensive protection features. Its versatility makes it suitable for various applications, including industrial equipment, telecom systems, LED lighting drivers, battery chargers, and motor control circuits. While it has some limitations, alternative models are available to meet specific requirements.