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TOP248FN
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TOP248FN

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Power Management
  • Characteristics: High Efficiency, Low Standby Power, Wide Input Voltage Range
  • Package: DIP-7
  • Essence: Offline Switcher
  • Packaging/Quantity: Tube/50 pieces

Specifications

  • Input Voltage Range: 85VAC to 265VAC
  • Output Power: Up to 48W
  • Frequency Range: 50Hz to 60Hz
  • Operating Temperature Range: -40°C to +125°C
  • Efficiency: Up to 88%
  • Standby Power: Less than 100mW

Detailed Pin Configuration

  1. VCC: Power Supply Voltage
  2. FB: Feedback Pin for Regulation
  3. COMP: Compensation Pin for Loop Stability
  4. CS: Current Sense Pin
  5. GND: Ground
  6. DRAIN: Drain Pin for Power MOSFET
  7. SOURCE: Source Pin for Power MOSFET

Functional Features

  • Primary-Side Control: Eliminates the need for an optocoupler and secondary-side feedback components.
  • Frequency-Jittering: Reduces EMI emissions.
  • Auto-Restart Protection: Ensures continuous operation in fault conditions.
  • Cycle-by-Cycle Current Limiting: Provides reliable overcurrent protection.

Advantages and Disadvantages

Advantages: - High efficiency leads to energy savings. - Low standby power reduces power consumption during idle periods. - Wide input voltage range allows for universal compatibility. - Primary-side control simplifies circuit design and reduces component count.

Disadvantages: - Limited output power compared to higher-rated devices. - Requires external components for certain applications. - Not suitable for high-voltage applications.

Working Principles

The TOP248FN is an offline switcher IC that operates in a flyback topology. It integrates a power MOSFET, high-voltage startup circuitry, and control circuitry into a single package. The IC uses primary-side control to regulate the output voltage without the need for an optocoupler or secondary-side feedback components. It employs frequency-jittering techniques to reduce electromagnetic interference (EMI) emissions. The device also features auto-restart protection and cycle-by-cycle current limiting for enhanced safety and reliability.

Detailed Application Field Plans

The TOP248FN is widely used in various power management applications, including:

  1. AC-DC Power Supplies: Provides efficient and compact power conversion for consumer electronics, industrial equipment, and lighting systems.
  2. LED Drivers: Enables constant current or constant voltage drive for LED lighting applications.
  3. Battery Chargers: Facilitates efficient charging of batteries in portable devices and electric vehicles.
  4. Offline Adapters: Converts AC input to regulated DC output for laptops, smartphones, and other electronic devices.
  5. Industrial Controls: Powers control circuits and motor drives in industrial automation systems.

Detailed and Complete Alternative Models

  1. TOP249YN: Similar specifications and features as TOP248FN but available in a different package (SMD-8).
  2. LNK304GN: Integrated offline switcher with similar functionality but optimized for lower power applications.
  3. UC3843AN: PWM controller IC suitable for offline flyback converters with higher power requirements.

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Énumérez 10 questions et réponses courantes liées à l'application de TOP248FN dans les solutions techniques

Sure! Here are 10 common questions and answers related to the application of TOP248FN in technical solutions:

  1. Q: What is TOP248FN? A: TOP248FN is a high-performance, offline switcher IC (integrated circuit) designed for use in various power supply applications.

  2. Q: What are the key features of TOP248FN? A: The key features of TOP248FN include primary-side regulation, integrated 700V MOSFET, frequency jittering for low EMI, and built-in protection features.

  3. Q: What is primary-side regulation (PSR)? A: Primary-side regulation is a technique where the control loop of the power supply is implemented on the primary side of the transformer, eliminating the need for an optocoupler or secondary feedback circuitry.

  4. Q: What are the typical applications of TOP248FN? A: TOP248FN can be used in various applications such as AC/DC power supplies, LED lighting, battery chargers, and industrial power systems.

  5. Q: How does TOP248FN help in reducing electromagnetic interference (EMI)? A: TOP248FN incorporates frequency jittering, which helps in spreading the switching frequency spectrum, reducing peak emissions and meeting EMI standards.

  6. Q: Does TOP248FN provide any protection features? A: Yes, TOP248FN includes built-in protection features like overvoltage protection (OVP), overload protection (OLP), and thermal shutdown.

  7. Q: Can TOP248FN operate in a wide input voltage range? A: Yes, TOP248FN can operate in a wide input voltage range typically from 85VAC to 265VAC.

  8. Q: What is the maximum output power that TOP248FN can handle? A: TOP248FN can handle output power up to 100W, depending on the application and thermal considerations.

  9. Q: Is TOP248FN suitable for flyback converter designs? A: Yes, TOP248FN is commonly used in flyback converter designs due to its primary-side regulation capability and integrated MOSFET.

  10. Q: Are there any reference designs or application notes available for TOP248FN? A: Yes, the manufacturer of TOP248FN provides reference designs and application notes that can help in designing power supplies using this IC efficiently.

Please note that these answers are general and may vary based on specific design requirements and application scenarios.