LNK304PN Manufacturer, Highlights, Functions and Other Details
23 April 2024
Ⅳ. Pin functional description of LNK304PN
Ⅵ. How to judge the quality of LNK304PN
Ⅶ. How to implement the power management function of LNK304PN?
The LNK304PN is an offline switching power supply chip with switching power supply control functions, integrated control and protection functions, and excellent energy-saving performance. The chip is designed to replace all linear and capacitively fed non-isolated power supplies in the output current range below 360mA at the same system cost, while delivering higher performance and energy efficiency. LNK304PN belongs to the category of AC/DC converter and is widely used in various electronic equipment. Its operating temperature range covers -40°C to 150°C, and the operating power supply current is 200uA, which allows it to work stably in various environmental conditions. In addition, LNK304PN is packaged in DIP-8, which not only has good heat dissipation performance, but also has high stability and reliability, as well as strong compatibility, allowing the chip to be easily integrated into various power supply designs.
Alternative models:
• LNK304P
The LNK304PN is manufactured by Power Integrations. As a leader in the semiconductor industry, Power Integrations is committed to providing efficient and highly reliable power control semiconductor solutions. In the field of electronic products, Power Integrations is a highly acclaimed brand, and its products are widely used in many fields such as industry, home appliances, green energy, consumer electronics, and LED lighting. The company produces a wide range of products, including integrated switches, power management ICs, offline switching power supplies, and LED drivers. Among them, power management IC, as the company's core product, is not only widely used, but also highly innovative. This series of products is carefully designed to provide users with highly precise power control and protection functions, and maintain stable performance in various complex working environments.
• Minimizes EMI filter cost
• Frequency jittering dramatically reduces EMI (~10 dB)
• Lowest cost and component count buck converter solution
• Tight tolerances and negligible temperature variations
• High breakdown voltage of 700 V provides excellent input surge withstand
• High thermal shutdown temperature (+135°C minimum)
• LNK302 uses a simplified controller without auto-restart for very low system cost
• Fully integrated auto-restart for short-circuit and open loop fault protection–saves external component costs
• 66 kHz operation with accurate current limit–allows low cost off-the-shelf 1 mH inductor for up to 120 mA output current
• SOURCE (S) Pin: This pin is the power MOSFET source connection. It is also the ground reference for the BYPASS and FEEDBACK pins.
• BYPASS (BP) Pin: Connection point for a 0.1 mF external bypass capacitor for the internally generated 5.8 V supply.
• DRAIN (D) Pin: Power MOSFET drain connection. Provides internal operating current for both start-up and steady-state operation.
• FEEDBACK (FB) Pin: During normal operation, switching of the power MOSFET is controlled by this pin. MOSFET switching is terminated when a current greater than 49 µA is delivered into this pin.
It is an offline switching power supply chip with the following roles and functions:
1. Energy-saving performance: LNK304PN adopts efficient switch control technology to improve energy conversion efficiency. It has low power consumption and standby mode to achieve energy saving and environmental protection.
2. Switching power supply control: LNK304PN can be used to design offline switching power supplies to convert AC input (such as 220V or 110V) into stable DC output for supply to electronic equipment. It has switch control, current control and protection functions.
3. Integrated control and protection functions: LNK304PN integrates functions such as current limit, switch control, overvoltage protection, overload protection and overtemperature protection. These protection functions ensure that the power supply stops working under abnormal circumstances to protect the safety of circuits and equipment.
First, we need to adjust the multimeter to the diode measurement range. Next, we use the black test lead to connect D (drain) and the red test lead to S (source). At this time, if everything is normal, there should be a voltage drop of 0.2 to 0.5. At this time, the multimeter will display between 0.2 to 0.5 number. Then, we connect the black test lead to S (source) and the red test lead to D (drain). There should be no voltage drop at this time and the multimeter should display OL or 1. Next, we keep the black test lead at S (source), touch G (gate) with the red test lead and quickly release it; keep the black test lead still, and then use the red test lead to connect D (drain). A small voltage drop should be observed at this point. If the multimeter shows a number of approximately 0.1, then the transistor is good; conversely, if the result does not conform to this rule, the transistor may be bad.
The power management function of LNK304PN is achieved through its integrated series of control and protection mechanisms. First of all, LNK304PN is an offline switching power supply chip. Its core function is to convert alternating current (AC) into direct current (DC). This process is achieved through switching power supply control to ensure that power can be supplied to electronic equipment stably and efficiently. Secondly, LNK304PN also uses frequency jittering function, which helps reduce electromagnetic interference (EMI). By adjusting the switching frequency, mutual interference with surrounding equipment can be effectively reduced and the stability and reliability of the power supply can be improved. In addition, LNK304PN ensures the safety and stability of the power supply through integrated protection functions. These protection functions include current limiting, overvoltage protection, overload protection, and overtemperature protection. When the power supply operates abnormally, such as overload, excessive voltage, excessive current, or chip overheating, these protection functions will respond quickly to prevent damage to circuits and equipment by stopping the power supply or other means.
Frequently Asked Questions
1. What is the operating temperature range of LNK304PN?
The operating temperature of LNK304PN ranges from -40°C to 150°C.
2. What is the LNK304PN?
The LNK304PN is an integrated circuit (IC) belonging to the LinkSwitch family manufactured by Power Integrations. It is commonly used in switch-mode power supplies (SMPS) for various electronic applications.
3. How does the auto-restart feature of the LNK304PN work?
The auto-restart feature of the LNK304PN monitors the output voltage and restarts the switching cycle in case of a fault condition such as a short circuit or open loop. This feature enhances the reliability of the power supply by automatically recovering from temporary faults.
