NCP1251BSN65T1G

Overview

Category: Integrated Circuit (IC)

Use: Power Management IC

Characteristics: - High voltage startup - Current mode control - Frequency jittering for EMI reduction - Built-in protection features - Low standby power consumption

Package: SOT-23-6

Essence: The NCP1251BSN65T1G is a power management IC designed for offline flyback converters. It integrates various functions required for efficient power conversion and provides reliable performance.

Packaging/Quantity: The NCP1251BSN65T1G is available in a SOT-23-6 package. It is typically sold in reels of 3000 units.

Specifications

• Input Voltage Range: 85V to 265V AC
• Output Power: Up to 5W
• Switching Frequency: 65kHz
• Startup Current: 25µA (typical)
• Operating Temperature Range: -40°C to +105°C

Pin Configuration

The NCP1251BSN65T1G has the following pin configuration:

____ VCC |1 6| GND FB |2 5| COMP CS |3 4| DRAIN ------

Functional Features

1. High Voltage Startup: The IC can start up from high input voltages, making it suitable for universal input applications.
2. Current Mode Control: The current mode control architecture ensures stable and accurate regulation of the output voltage.
3. Frequency Jittering: The built-in frequency jittering feature reduces electromagnetic interference (EMI) emissions, ensuring compliance with regulatory standards.
4. Built-in Protection Features: The IC incorporates various protection mechanisms such as overvoltage protection (OVP), overcurrent protection (OCP), and thermal shutdown.
5. Low Standby Power Consumption: The IC consumes minimal power in standby mode, contributing to energy efficiency.

Advantages and Disadvantages

Advantages: - High voltage startup enables universal input compatibility. - Current mode control ensures stable output regulation. - Frequency jittering reduces EMI emissions. - Built-in protection features enhance system reliability. - Low standby power consumption contributes to energy efficiency.

Disadvantages: - Limited output power capability (up to 5W). - Restricted operating temperature range (-40°C to +105°C).

Working Principles

The NCP1251BSN65T1G operates as a flyback converter, which is a type of switched-mode power supply. It converts the high input voltage from the AC mains into a regulated low-voltage DC output. The IC utilizes current mode control to maintain stable output voltage despite variations in load and input conditions. By incorporating frequency jittering, it reduces EMI emissions, ensuring compliance with electromagnetic compatibility (EMC) standards. The IC also includes built-in protection features to safeguard against abnormal operating conditions.

Detailed Application Field Plans

The NCP1251BSN65T1G is commonly used in various applications, including:

1. Power Adapters: The IC is suitable for designing compact and efficient power adapters used in consumer electronics, such as laptops, smartphones, and tablets.
2. LED Lighting: It can be employed in LED driver circuits for lighting applications, providing reliable and efficient power conversion.
3. Industrial Power Supplies: The IC finds application in industrial power supplies, offering high voltage startup and robust protection features.
4. Home Appliances: It can be utilized in power management circuits for home appliances like refrigerators, air conditioners, and washing machines.

Detailed and Complete Alternative Models

1. NCP1251BDR2G: Similar to NCP1251BSN65T1G, but available in SOIC-8 package.
2. NCP1251ADR2G: Another alternative with the same functionality, but offered in a different package (SOIC-8).

These alternative models provide flexibility in choosing the appropriate package and pin configuration based on specific design requirements.

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