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TOP257GN
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TOP257GN

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Power Management
  • Characteristics: High Efficiency, Low Standby Power, Wide Input Voltage Range
  • Package: PDIP-7, SMD-7C
  • Essence: Switching Power Supply Controller
  • Packaging/Quantity: Tube/50 pieces

Specifications

  • Input Voltage Range: 85VAC to 265VAC
  • Output Power: Up to 25W
  • Frequency Range: 50Hz to 400Hz
  • Operating Temperature Range: -40°C to +125°C
  • Efficiency: Up to 90%
  • 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. DRAIN: High-Voltage Power MOSFET Drain Connection
  6. SOURCE: High-Voltage Power MOSFET Source Connection
  7. GND: Ground Connection

Functional Features

  • Primary-Side Control: Eliminates the need for an optocoupler and secondary-side feedback circuitry.
  • Auto-restart Protection: Ensures safe operation by automatically restarting the power supply in case of a fault condition.
  • Frequency Jittering: Reduces EMI emissions and improves system reliability.
  • Accurate Constant Output Voltage: Provides stable and regulated output voltage under varying load conditions.

Advantages and Disadvantages

Advantages: - High efficiency leads to energy savings. - Wide input voltage range allows for universal compatibility. - Compact package size enables space-saving designs. - Auto-restart protection enhances system reliability.

Disadvantages: - Requires external components for complete power supply implementation. - Limited output power compared to some other ICs in the same category.

Working Principles

The TOP257GN is a primary-side control switching power supply controller. It operates by regulating the duty cycle of the power MOSFET to maintain a constant output voltage. The feedback pin (FB) monitors the output voltage and adjusts the duty cycle accordingly. The compensation pin (COMP) ensures stable loop operation by compensating for frequency response characteristics. The current sense pin (CS) provides accurate current sensing for overcurrent protection.

Detailed Application Field Plans

The TOP257GN is widely used in various applications, including:

  1. Power Adapters: Provides efficient and regulated power for laptops, smartphones, and other electronic devices.
  2. LED Lighting: Enables high-efficiency LED drivers for residential, commercial, and industrial lighting applications.
  3. Home Appliances: Powers energy-efficient appliances such as refrigerators, air conditioners, and washing machines.
  4. Industrial Equipment: Supplies reliable power for motor drives, control systems, and automation equipment.

Detailed and Complete Alternative Models

  • TOP258PN
  • TOP259GN
  • TNY278PN
  • TNY279PN
  • LNK364PN

These alternative models offer similar functionality and can be used as replacements for the TOP257GN in various applications.

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Enumere 10 preguntas y respuestas comunes relacionadas con la aplicación de TOP257GN en soluciones técnicas

Sure! Here are 10 common questions and answers related to the application of TOP257GN in technical solutions:

  1. Q: What is TOP257GN? A: TOP257GN is a highly integrated offline switcher IC (integrated circuit) designed for low-power applications.

  2. Q: What are the typical applications of TOP257GN? A: TOP257GN is commonly used in power supply designs for various electronic devices such as TVs, monitors, set-top boxes, and LED lighting.

  3. Q: What is the input voltage range supported by TOP257GN? A: The input voltage range of TOP257GN is typically between 85V AC and 265V AC.

  4. Q: What is the maximum output power that can be achieved with TOP257GN? A: The maximum output power depends on the specific design and external components used, but it can typically reach up to 30 watts.

  5. Q: Does TOP257GN require an external MOSFET? A: No, TOP257GN integrates a high-voltage power MOSFET, eliminating the need for an external one.

  6. Q: Can TOP257GN operate in a wide temperature range? A: Yes, TOP257GN is designed to operate reliably in a wide temperature range, typically from -40°C to 150°C.

  7. Q: Is TOP257GN capable of providing multiple outputs? A: Yes, TOP257GN supports multiple outputs by using external components such as transformers and rectifiers.

  8. Q: Does TOP257GN have built-in protection features? A: Yes, TOP257GN incorporates various protection features like overvoltage protection, overcurrent protection, and thermal shutdown.

  9. Q: Can TOP257GN be used in both isolated and non-isolated power supply designs? A: Yes, TOP257GN can be used in both isolated and non-isolated power supply designs depending on the application requirements.

  10. Q: Are there any reference designs available for TOP257GN? A: Yes, the manufacturer of TOP257GN provides reference designs and application notes to assist engineers in implementing the IC effectively.

Please note that these answers are general and may vary depending on the specific design considerations and requirements.