Power supplies designed for high power-density in applications with limited airflow

The new RECOM RAC150-G series encompasses switched-mode power supplies designed for high power-density in applications which operate with limited airflow. Under natural convection, the SMPS modules provide 125W from a compact 4x2-inch open-frame design and even up to 122W in an aluminium case; under forced air cooling, a constant output of up to 150W is achieved. Ensuring long service life and reliability at such a high power density required overcoming a number of design challenges, such as placing the SMD semiconductors on the board in such a way as to dissipate excess heat through copper surfaces acting as heat sinks on the board and through an aluminium base plate via heat-conducting pads. The new power supplies operate at input voltages between 90VAC and 264VAC at temperatures ranging from -30C to +70C. Modules with 12V, 24V, and 48V outputs are currently available for shipping; the modules come with short-circuit as well as overvoltage protection and a typical efficiency of 91%. These SMPS modules are suitable for use across the world, and are certified according to IEC/EN/UL 60950-1 as well as the new IEC/EN/UL62368-1 standard, and comply with the RoHS directive and EN55022/24 Class B for electromagnetic compatibility. The modules come with a three-year guarantee.