LM5035ASQX/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Mode PWM Controller

Characteristics: - High voltage input range - Wide operating frequency range - Adjustable soft-start time - Overvoltage protection - Undervoltage lockout - Current limit protection

Package: 20-pin LLP (Leadless Leadframe Package)

Essence: The LM5035ASQX/NOPB is a voltage mode PWM controller designed for high voltage applications. It provides various protection features and adjustable parameters to control the power supply.

Packaging/Quantity: The LM5035ASQX/NOPB is available in tape and reel packaging, with 250 units per reel.

Specifications

• Input Voltage Range: 4.5V to 100V
• Operating Frequency Range: 50kHz to 1MHz
• Soft-Start Time: Adjustable from 0ms to 20ms
• Overvoltage Protection Threshold: Adjustable from 110% to 140% of the reference voltage
• Undervoltage Lockout Threshold: Adjustable from 3.3V to 8V
• Current Limit Protection: Adjustable from 0.5A to 10A

Pin Configuration

The LM5035ASQX/NOPB has a 20-pin LLP package with the following pin configuration:

1. VCC - Power Supply Input
2. GND - Ground
3. FB - Feedback Input
4. COMP - Error Amplifier Output
5. SS/TR - Soft-Start/Tracking Input
6. RT/CT - Timing Components Connection
7. SYNC - Synchronization Input
8. EN/UVLO - Enable/Undervoltage Lockout Input
9. UVLO - Undervoltage Lockout Output
10. OVP - Overvoltage Protection Output
11. ISENSE - Current Sense Input
12. CSRTN - Current Sense Return
13. VREF - Reference Voltage Output
14. AGND - Analog Ground
15. SS/TR2 - Soft-Start/Tracking Input 2
16. COMP2 - Error Amplifier Output 2
17. RT/CT2 - Timing Components Connection 2
18. SYNC2 - Synchronization Input 2
19. EN/UVLO2 - Enable/Undervoltage Lockout Input 2
20. UVLO2 - Undervoltage Lockout Output 2

Functional Features

1. Voltage Mode Control: The LM5035ASQX/NOPB utilizes voltage mode control to regulate the output voltage of the power supply.

2. Adjustable Soft-Start Time: The soft-start time can be adjusted from 0ms to 20ms, allowing for a controlled startup of the power supply.

3. Protection Features: The controller includes overvoltage protection, undervoltage lockout, and current limit protection to safeguard the power supply and connected components.

4. Wide Operating Frequency Range: The LM5035ASQX/NOPB supports an operating frequency range of 50kHz to 1MHz, providing flexibility in power supply design.

Advantages and Disadvantages

Advantages: - High voltage input range allows for use in various applications. - Wide operating frequency range provides design flexibility. - Adjustable parameters enable customization for specific requirements. - Comprehensive protection features enhance system reliability.

Disadvantages: - Limited pin configuration options may restrict certain circuit designs. - Requires external timing components for operation.

Working Principles

The LM5035ASQX/NOPB operates based on voltage mode control, where the feedback signal is compared with a reference voltage to regulate the output voltage. The error amplifier adjusts the duty cycle of the PWM signal to maintain the desired output voltage. The soft-start feature gradually increases the duty cycle during startup to prevent excessive inrush current.

Application Field Plans

The LM5035ASQX/NOPB is suitable for a wide range of applications, including: - Industrial power supplies - Telecom infrastructure - Automotive electronics - LED lighting systems - Renewable energy systems

Alternative Models

1. LM5036ASQX/NOPB: Similar to LM5035ASQX/NOPB with additional features.
2. LM5034ASQX/NOPB: Similar to LM5035ASQX/NOPB with different pin configuration.
3. LM5025ASQX/NOPB: Voltage mode PWM controller with lower input voltage range.

These alternative models offer similar functionality and can be considered based on specific design requirements.

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