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TOP268KG
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TOP268KG

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Power Management
  • Characteristics: High Efficiency, Low Standby Power, Wide Input Voltage Range
  • Package: TO-220-7C
  • Essence: Switching Power Supply Controller
  • Packaging/Quantity: Tray / 50 pieces per tray

Specifications

  • Input Voltage Range: 85VAC to 265VAC
  • Output Power: Up to 100W
  • 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
  2. GND: Ground
  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

Functional Features

  • Primary-Side Control: Eliminates the need for an optocoupler and secondary-side feedback circuitry.
  • Frequency Jittering: Reduces EMI emissions and improves system reliability.
  • Auto-Restart Protection: Ensures continuous operation by automatically restarting after a fault condition is removed.
  • Cycle-by-Cycle Current Limiting: Provides accurate current regulation and protects against overcurrent conditions.

Advantages

  • High efficiency, reducing power consumption and heat dissipation.
  • Low standby power, meeting energy-saving requirements.
  • Wide input voltage range, suitable for various applications.
  • Integrated protection features enhance system reliability.
  • Primary-side control simplifies circuit design and reduces component count.

Disadvantages

  • Requires careful consideration of EMI filtering and layout design to minimize noise.
  • Limited output power compared to higher-rated devices.
  • Not suitable for applications requiring extremely high switching frequencies.

Working Principles

The TOP268KG is a primary-side control switching power supply controller. It operates by regulating the duty cycle of the power MOSFET in the primary side of the transformer. The feedback pin (FB) monitors the output voltage, and the compensation pin (COMP) adjusts the loop stability. By adjusting the duty cycle, the controller maintains a stable output voltage. The integrated protection features ensure safe operation under various conditions.

Detailed Application Field Plans

The TOP268KG is commonly used in various power management applications, including:

  1. AC/DC Adapters
  2. LED Lighting
  3. Industrial Power Supplies
  4. Home Appliances
  5. Consumer Electronics

Detailed and Complete Alternative Models

  1. TOP249Y: Similar functionality with different package (TO-220-7)
  2. TOP267EG: Higher output power capability (up to 150W)
  3. TOP269VG: Lower standby power consumption
  4. TOP250YN: Lower cost option with reduced features

These alternative models provide flexibility in choosing the most suitable solution based on specific requirements and constraints.

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Lista 10 Vanliga frågor och svar relaterade till tillämpningen av TOP268KG i tekniska lösningar

Sure! Here are 10 common questions and answers related to the application of TOP268KG in technical solutions:

  1. Q: What is TOP268KG? A: TOP268KG is a high-performance integrated switcher used for power management applications.

  2. Q: What are the typical applications of TOP268KG? A: TOP268KG is commonly used in offline flyback power supplies, LED lighting, and other low-power applications.

  3. Q: What is the maximum output power that TOP268KG can handle? A: TOP268KG can handle output powers up to 100W, depending on the specific application and design considerations.

  4. Q: Does TOP268KG require an external MOSFET? A: No, TOP268KG integrates a high-voltage power MOSFET, eliminating the need for an external MOSFET.

  5. Q: What is the input voltage range supported by TOP268KG? A: TOP268KG supports a wide input voltage range from 85VAC to 265VAC, making it suitable for universal mains applications.

  6. Q: Can TOP268KG operate in continuous or discontinuous conduction mode? A: TOP268KG can operate in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM), providing flexibility in different load conditions.

  7. Q: Does TOP268KG have built-in protection features? A: Yes, TOP268KG incorporates various protection features such as overvoltage protection (OVP), overload protection (OLP), and thermal shutdown (TSD).

  8. Q: What is the efficiency of TOP268KG? A: TOP268KG offers high efficiency, typically above 85%, which helps reduce power dissipation and improve overall system performance.

  9. Q: Can TOP268KG be used in dimmable LED lighting applications? A: Yes, TOP268KG can be used in dimmable LED lighting applications by incorporating external circuitry for dimming control.

  10. Q: Are there any evaluation boards or reference designs available for TOP268KG? A: Yes, Power Integrations provides evaluation boards and reference designs for TOP268KG, which can help simplify the design process and accelerate time to market.

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