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LNK305PN
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LNK305PN

Product Overview

Category: Integrated Circuit (IC)

Use: Power Management IC

Characteristics: - Low-cost, energy-efficient power conversion solution - Designed for offline flyback converters - Suitable for applications requiring output power up to 5 W - Provides accurate constant voltage (CV) and constant current (CC) regulation

Package: DIP-7 (Dual In-line Package)

Essence: LNK305PN is a power management IC that offers a cost-effective and efficient solution for offline flyback converters. It provides accurate regulation of constant voltage and constant current, making it suitable for various low-power applications.

Packaging/Quantity: LNK305PN is typically sold in reels or tubes containing multiple units. The exact quantity may vary depending on the supplier.

Specifications

  • Input Voltage Range: 85 VAC to 265 VAC
  • Output Power: Up to 5 W
  • Output Voltage Range: 3.6 V to 28 V
  • Maximum Output Current: 200 mA
  • Frequency Range: 66 kHz to 132 kHz
  • Operating Temperature Range: -40°C to +150°C

Pin Configuration

LNK305PN features a DIP-7 package with the following pin configuration:

  1. Drain (D)
  2. Source (S)
  3. Control (C)
  4. Feedback (F)
  5. Ground (GND)
  6. Sense (S)
  7. Vcc (V)

Functional Features

  • Primary-Side Regulation (PSR): Eliminates the need for an optocoupler and secondary-side feedback components, reducing system complexity and cost.
  • Auto-restart Protection: Ensures continuous operation by automatically restarting the converter in the event of a fault condition, such as output overload or short circuit.
  • Frequency Jittering: Reduces electromagnetic interference (EMI) by spreading the switching frequency spectrum, enabling compliance with international EMI standards.
  • Advanced Thermal Foldback: Protects the IC from overheating by reducing the output power when the junction temperature exceeds a certain threshold.

Advantages and Disadvantages

Advantages: - Cost-effective solution for low-power applications - Compact DIP-7 package allows for easy integration into various designs - Primary-side regulation simplifies circuit design and reduces component count - Auto-restart protection enhances system reliability - Frequency jittering reduces EMI emissions - Advanced thermal foldback protects against overheating

Disadvantages: - Limited output power capability (up to 5 W) - Not suitable for high-power applications

Working Principles

LNK305PN utilizes primary-side regulation (PSR) to achieve accurate constant voltage and constant current regulation. The IC senses the output voltage through the feedback pin and adjusts the duty cycle of the internal power switch accordingly. This eliminates the need for an optocoupler and secondary-side feedback components, reducing cost and complexity.

The IC operates in a flyback converter topology, where energy is stored in the transformer during the switch-on period and transferred to the output during the switch-off period. The frequency jittering feature helps reduce electromagnetic interference (EMI) emissions, ensuring compliance with international standards.

In the event of a fault condition, such as output overload or short circuit, the auto-restart protection feature automatically restarts the converter after a brief shutdown period, ensuring continuous operation.

Detailed Application Field Plans

LNK305PN finds application in various low-power electronic devices, including but not limited to: - LED lighting systems - Battery chargers - Small appliances - IoT devices - Industrial controls - Consumer electronics

Its compact size, cost-effectiveness, and primary-side regulation make it suitable for applications where space, cost, and simplicity are important factors.

Detailed and Complete Alternative Models

  • LNK302PN
  • LNK304PN
  • LNK306PN
  • LNK307PN

These alternative models offer similar functionality and characteristics to LNK305PN, providing flexibility in design choices based on specific requirements.

(Note: The above list is not exhaustive and may vary depending on the availability and advancements in power management ICs.)

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技術ソリューションにおける LNK305PN 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 LNK305PN in technical solutions:

  1. Q: What is LNK305PN? A: LNK305PN is an integrated offline switcher IC designed for low-power applications, providing primary-side regulation without the need for an optocoupler.

  2. Q: What are the typical applications of LNK305PN? A: LNK305PN is commonly used in applications such as LED lighting, smart home devices, industrial controls, and consumer electronics.

  3. Q: What is the input voltage range supported by LNK305PN? A: LNK305PN supports a wide input voltage range from 85VAC to 265VAC, making it suitable for global use.

  4. Q: Can LNK305PN be used with both AC and DC inputs? A: No, LNK305PN is specifically designed for AC input applications and does not support DC input.

  5. Q: What is the maximum output power that can be achieved with LNK305PN? A: The maximum output power depends on the specific design and thermal considerations, but typically ranges from 3W to 15W.

  6. Q: Does LNK305PN require an external feedback circuit? A: Yes, LNK305PN requires an external resistor divider network to set the desired output voltage.

  7. Q: Is LNK305PN capable of dimming LED lights? A: No, LNK305PN does not have built-in dimming capabilities. However, it can be combined with external components to achieve dimming functionality.

  8. Q: What are the key advantages of using LNK305PN in technical solutions? A: Some key advantages include high efficiency, low component count, primary-side regulation, and protection features such as over-temperature and over-voltage protection.

  9. Q: Can LNK305PN operate in a wide temperature range? A: Yes, LNK305PN is designed to operate reliably in a wide temperature range from -40°C to 150°C.

  10. Q: Are there any reference designs available for LNK305PN? A: Yes, the manufacturer provides reference designs and application notes that can help in implementing LNK305PN in various technical solutions.

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