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NCP1249AD65R2G
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NCP1249AD65R2G

Basic Information Overview

  • Category: Integrated Circuit (IC)
  • Use: Power Management
  • Characteristics:
    • High efficiency
    • Low standby power consumption
    • Wide input voltage range
    • Overvoltage and overcurrent protection
  • Package: DFN-8 (Dual Flat No-Lead)
  • Essence: Switching Power Supply Controller
  • Packaging/Quantity: Tape and Reel, 3000 units per reel

Specifications

  • Input Voltage Range: 85V to 265V AC
  • Output Voltage: Adjustable, typically 5V to 24V DC
  • Maximum Output Current: 1.5A
  • Frequency Range: 65kHz to 100kHz
  • Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The NCP1249AD65R2G has the following pin configuration:

  1. VCC: Power supply input
  2. GND: Ground reference
  3. FB: Feedback pin for output voltage regulation
  4. COMP: Compensation pin for stability control
  5. CS: Current sense pin for overcurrent protection
  6. SS: Soft-start pin for controlled startup
  7. HV: High-voltage pin for direct connection to rectified AC input
  8. DRAIN: Switching transistor drain pin

Functional Features

  • Primary-side regulation for simplified design
  • Built-in high-voltage startup circuitry
  • Frequency jittering for reduced EMI emissions
  • Cycle-by-cycle current limiting for overcurrent protection
  • Auto-restart after fault conditions
  • Internal soft-start for controlled startup

Advantages and Disadvantages

Advantages: - High efficiency leads to energy savings - Wide input voltage range allows for universal compatibility - Overvoltage and overcurrent protection enhance system reliability - Compact package size saves board space

Disadvantages: - Limited maximum output current of 1.5A - Operating temperature range may restrict certain applications

Working Principles

The NCP1249AD65R2G is a switching power supply controller that operates in a flyback topology. It regulates the output voltage by adjusting the duty cycle of the internal power switch. The high-voltage startup circuitry enables direct connection to the rectified AC input, eliminating the need for an auxiliary winding. The controller uses primary-side regulation, where the feedback signal is derived from the primary side of the transformer. This simplifies the design and reduces component count.

Detailed Application Field Plans

The NCP1249AD65R2G is commonly used in various applications, including:

  1. Power adapters for consumer electronics
  2. LED lighting drivers
  3. Industrial power supplies
  4. Home appliances
  5. Automotive electronics

Detailed and Complete Alternative Models

Some alternative models that can be considered as alternatives to the NCP1249AD65R2G are:

  1. NCP1250AD65R2G
  2. NCP1260AD65R2G
  3. NCP1271AD65R2G
  4. NCP1280AD65R2G

These models offer similar functionality and characteristics, providing flexibility in design choices.

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技術ソリューションにおける NCP1249AD65R2G 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 NCP1249AD65R2G in technical solutions:

  1. Q: What is NCP1249AD65R2G? A: NCP1249AD65R2G is a power management IC (PMIC) designed for offline flyback converters used in various technical solutions.

  2. Q: What is the input voltage range supported by NCP1249AD65R2G? A: The input voltage range supported by NCP1249AD65R2G is typically between 85V and 265V AC.

  3. Q: What is the maximum output power that can be achieved with NCP1249AD65R2G? A: NCP1249AD65R2G can support a maximum output power of up to 65W.

  4. Q: Can NCP1249AD65R2G operate in continuous or discontinuous conduction mode? A: NCP1249AD65R2G can operate in both continuous and discontinuous conduction modes, depending on the load conditions.

  5. Q: Does NCP1249AD65R2G have built-in protection features? A: Yes, NCP1249AD65R2G includes various built-in protection features such as overvoltage protection, overcurrent protection, and thermal shutdown.

  6. Q: What is the typical efficiency of NCP1249AD65R2G? A: The typical efficiency of NCP1249AD65R2G is around 85-90%, depending on the operating conditions.

  7. Q: Can NCP1249AD65R2G be used in applications requiring power factor correction (PFC)? A: No, NCP1249AD65R2G does not include power factor correction functionality. It is primarily designed for non-PFC applications.

  8. Q: What are the recommended external components to be used with NCP1249AD65R2G? A: The recommended external components include a transformer, input and output capacitors, diode, and feedback resistors.

  9. Q: Is NCP1249AD65R2G suitable for universal input voltage applications? A: Yes, NCP1249AD65R2G is designed to support universal input voltage applications, typically ranging from 85V to 265V AC.

  10. Q: Can NCP1249AD65R2G be used in battery charging applications? A: No, NCP1249AD65R2G is not specifically designed for battery charging applications. It is primarily intended for offline flyback converters.

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