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TOP257PN
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TOP257PN

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Power Management
  • Characteristics: High Efficiency, Low Standby Power, Wide Input Voltage Range
  • Package: DIP-7 (Dual In-line Package with 7 pins)
  • Essence: Switching Power Supply Controller
  • Packaging/Quantity: Tray, Reel / 2500 pieces per reel

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 input
  2. FB: Feedback pin for output voltage regulation
  3. COMP: Compensation pin for loop stability
  4. CS: Current sense pin for current limit protection
  5. GND: Ground reference
  6. DRAIN: Switching transistor drain connection
  7. SOURCE: Switching transistor source connection

Functional Features

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

Advantages and Disadvantages

Advantages: - High efficiency leading to energy savings - Wide input voltage range for universal compatibility - Compact package size for space-constrained applications - Simplified design due to primary-side control - Reduced component count and cost

Disadvantages: - Requires careful consideration of thermal management due to high power dissipation - Limited output power compared to higher-rated controllers - Not suitable for applications requiring extremely low standby power

Working Principles

TOP257PN 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 circuitry. The integrated high-voltage power MOSFET allows for efficient power conversion.

The controller regulates the output voltage by adjusting the duty cycle of the switching transistor 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

TOP257PN is commonly used in various power management applications, including:

  1. AC-DC Adapters
  2. LED Lighting
  3. Set-Top Boxes
  4. Audio/Video Equipment
  5. Industrial Power Supplies

Its wide input voltage range and high efficiency make it suitable for universal power supplies and energy-efficient devices.

Detailed and Complete Alternative Models

Some alternative models to TOP257PN with similar functionality are:

  1. TNY278PN
  2. LNK364PN
  3. FAN7602B
  4. UC3843B
  5. NCP1200P60

These alternatives can be considered based on specific application requirements and availability.

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技術ソリューションにおける TOP257PN の適用に関連する 10 件の一般的な質問と回答をリストします。

Sure! Here are 10 common questions and answers related to the application of TOP257PN in technical solutions:

  1. Q: What is TOP257PN?
    A: TOP257PN is a highly integrated offline switcher IC (integrated circuit) designed for low-power applications.

  2. Q: What are the typical applications of TOP257PN?
    A: TOP257PN 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 maximum output power that TOP257PN can handle?
    A: TOP257PN can handle output powers up to 45 watts, making it suitable for low to medium power applications.

  4. Q: Does TOP257PN require an external MOSFET?
    A: No, TOP257PN integrates a high-voltage power MOSFET, eliminating the need for an external one.

  5. Q: Can TOP257PN operate with both AC and DC inputs?
    A: Yes, TOP257PN can operate with a wide input voltage range from 85VAC to 265VAC or 100VDC to 400VDC.

  6. Q: Is TOP257PN capable of providing multiple output voltages?
    A: Yes, TOP257PN supports multiple outputs by using external components such as transformers and rectifiers.

  7. Q: What are the key features of TOP257PN?
    A: Some key features of TOP257PN include primary-side regulation, frequency jittering for reduced EMI, and built-in protection features like overvoltage and overcurrent protection.

  8. Q: How does primary-side regulation work in TOP257PN?
    A: Primary-side regulation allows TOP257PN to regulate the output voltage without requiring an optocoupler or secondary feedback circuitry, simplifying the design and reducing costs.

  9. Q: Can TOP257PN operate in a continuous or discontinuous mode?
    A: TOP257PN can operate in both continuous and discontinuous modes, depending on the load conditions.

  10. Q: Are there any reference designs available for TOP257PN?
    A: Yes, Power Integrations, the manufacturer of TOP257PN, provides various reference designs and application notes to assist designers in implementing the IC effectively.

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