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TOP257EG
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TOP257EG

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Power Management
  • Characteristics: High Efficiency, Low Standby Power, Wide Input Voltage Range
  • Package: TO-220-7L
  • Essence: Switching Power Supply Controller
  • Packaging/Quantity: Tray/1000 units per tray

Specifications

  • Input Voltage Range: 85VAC to 265VAC
  • Output Power: Up to 45W
  • Switching Frequency: 132 kHz to 150 kHz
  • Operating Temperature Range: -40°C to +125°C
  • Protection Features: Overvoltage Protection, Overcurrent Protection, Thermal Shutdown

Detailed Pin Configuration

  1. VCC: Power supply voltage for internal control circuitry
  2. GND: Ground reference
  3. FB: Feedback pin for output voltage regulation
  4. COMP: Compensation pin for loop stability
  5. DRAIN: High-voltage power MOSFET drain connection
  6. SOURCE: High-voltage power MOSFET source connection
  7. CS: Current sense pin for overcurrent protection and current limit

Functional Features

  • Integrated high-voltage power MOSFET
  • Primary-side control eliminates optocoupler and secondary-side feedback components
  • Auto-restart protection for fault conditions
  • Frequency jittering for reduced EMI emissions
  • Built-in soft-start for controlled startup

Advantages and Disadvantages

Advantages

  • High efficiency leading to energy savings
  • Low standby power consumption
  • Simplified design due to primary-side control
  • Reduced component count and cost
  • Wide input voltage range for universal compatibility

Disadvantages

  • Requires careful consideration of layout and thermal management due to high switching frequency
  • Limited output power compared to some other power management ICs

Working Principles

TOP257EG is a switching power supply controller that operates in a flyback topology. It utilizes primary-side control, eliminating the need for an optocoupler and secondary-side feedback components. The integrated high-voltage power MOSFET allows for efficient power conversion.

The controller regulates the output voltage by adjusting the duty cycle of the power MOSFET based on the feedback received from the FB pin. It provides various protection features such as overvoltage protection, overcurrent protection, and thermal shutdown to ensure safe operation.

Detailed Application Field Plans

  • AC-DC power supplies for consumer electronics
  • LED lighting applications
  • Industrial power systems
  • Telecom and networking equipment
  • Home appliances

Detailed and Complete Alternative Models

  1. TOP258PN: Similar functionality with different package (DIP-8)
  2. TOP259GN: Higher output power capability (up to 100W)
  3. TOP256EN: Lower output power capability (up to 30W)

Note: This is not an exhaustive list, and there are other alternative models available in the market.

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10個與TOP257EG在技術方案中應用相關的常見問題與解答

Sure! Here are 10 common questions and answers related to the application of TOP257EG in technical solutions:

  1. Q: What is TOP257EG? A: TOP257EG is a highly integrated offline switcher IC (integrated circuit) designed for low-power applications.

  2. Q: What are the typical applications of TOP257EG? A: TOP257EG is commonly used in various power supply applications, such as adapters, chargers, LED lighting, and industrial controls.

  3. Q: What is the input voltage range supported by TOP257EG? A: The input voltage range of TOP257EG is typically between 85VAC and 265VAC, making it suitable for worldwide use.

  4. Q: What is the maximum output power that TOP257EG can handle? A: TOP257EG can handle output powers up to 60 watts, depending on the specific design and thermal considerations.

  5. Q: Does TOP257EG require an external MOSFET? A: No, TOP257EG integrates a high-voltage power MOSFET, eliminating the need for an external MOSFET in most applications.

  6. Q: Can TOP257EG operate in a wide temperature range? A: Yes, TOP257EG is designed to operate reliably in a wide temperature range, typically from -40°C to 150°C.

  7. Q: Does TOP257EG provide protection features? A: Yes, TOP257EG includes various protection features like overvoltage protection, overcurrent protection, and thermal shutdown.

  8. Q: Can TOP257EG be used in flyback converter topologies? A: Yes, TOP257EG is specifically designed for flyback converter applications and provides excellent performance in this topology.

  9. Q: Is TOP257EG compatible with both primary-side and secondary-side regulation? A: Yes, TOP257EG supports both primary-side and secondary-side regulation, offering flexibility in power supply designs.

  10. Q: Are there any evaluation boards or reference designs available for TOP257EG? A: Yes, Power Integrations, the manufacturer of TOP257EG, provides evaluation boards and reference designs to help engineers get started with their designs.

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