LNK305PN equivalent & pinout | circuit

LNK305PN Pinout Equivalent

1：Overview of The LNK305PN:

The LNK305PN is a LinkSwitch-TN series offline AC/DC switching power supply IC produced by Power Integrations (PI). It is primarily used for low-cost, low-power designs, serving as an alternative to traditional linear regulators or capacitor drop circuits. The LNK305PN operates with an input voltage range of 85 to 265VAC, supporting global compatibility. It integrates a 700V MOSFET, oscillator, current limiting, and thermal protection, requiring minimal external components (just resistors, capacitors, and inductors). It supports Buck, Buck-Boost, and Flyback topologies. The no-load power consumption is extremely low (<50mW at 115VAC, <80mW at 230VAC), meeting Energy Star and CEC efficiency standards.

2：LNK305PN Important pin function definition:

3：Alternative model recommendation:

When choosing alternative products, factors such as the performance, cost, and supply stability of the chip need to be comprehensively considered, and the circuit should be appropriately designed and adjusted according to specific application requirements.

OB2263AP: It is also applicable to low-power offline switching power supplies, supporting a wide input voltage range and enabling high-precision constant voltage/constant current output control. Similar to LNK305PN, it also has multiple protection functions such as overcurrent protection, overvoltage protection, and overtemperature protection, which can effectively ensure the stability and safety of the power supply system.

PR6249E: This chip has good performance in the field of low-power switching power supplies. It has characteristics such as low standby power consumption and high conversion efficiency. Its application target is relatively consistent with that of LNK305PN. It also integrates multiple protection functions, which can improve the reliability of the power supply.

PN8145T: Can be used in non-isolated buck switching power supplies and can achieve efficient power conversion. Like LNK305PN, it also supports constant voltage/constant current output control and is suitable for the power supply requirements of various low-power electronic products.
The performance indicators such as startup time and load regulation rate of PN8145 may be different from those of LNK305PN. In practical applications, it needs to be selected and optimized according to specific requirements.

SD6830: Integrated with high-voltage power MOSFET and controller, it can achieve constant voltage/constant current output control. This chip has the advantages of low standby power consumption and high efficiency, and is equipped with perfect protection functions, which can effectively improve the reliability and stability of the power supply.