Power Integrations, Inc. AC DC Converters, Offline Switches TOP255LG

The TOP255LG is part of the TOPSwitch-HX family of integrated offline switchers designed for AC to DC conversion. It features a multi-mode operation that enhances efficiency across various load conditions. The device supports output power levels of up to 54 W in adapter configurations and 35 W in open frame applications, making it suitable for a range of power supply designs. This converter operates with a universal input voltage range of 85-265 VAC and includes advanced protection features such as user-programmable output overvoltage protection (OVP) and line undervoltage detection to prevent operational glitches. The device is designed with low thermal impedance, allowing for operation without a heatsink up to 35 W, which is beneficial for space-constrained applications. The TOP255LG also incorporates a built-in soft-start feature to minimize startup stress and an accurate thermal shutdown function that automatically recovers without requiring a manual reset. Its frequency of operation is set at 132 kHz, which aids in reducing the size of transformers and power supplies, while frequency jittering helps to lower electromagnetic interference (EMI) filter costs. Engineers considering this product will find it advantageous for applications requiring compact, efficient, and reliable power conversion solutions.