Ericsson Microelectronics (Sweden) recently expanded its PKN 4000 family of 50W converters with two new dual-output modules and four new single-output versions. With a profile height of 8.5mm, the PKN 4000 family is suitable for use in information technology and telecom applications where board spacing is down to 15mm and input voltages range from 36V to 75V. These modules are suitable for use as distributed power sources in decentralized 48 or 60Vdc power systems.
The dual-output ranges are 3.3V/2.5V and 3.3V/1.8V versions and the range of the single-output modules now includes 5V, 3.3V, 2.5V, 1.8V and 1.5V versions. All types include individually regulated outputs. In addition, and the dual-output versions are the same size as the single-output converters.
Designed around a metallic-copper-on-ceramic substrate and using thick-film technology, synchronous rectification and a high degree of silicon integration, Ericsson claims that the PKN 4000 family has exceptional thermal properties and typical operating efficiencies of over 90 percent. The high mean time between failure figures are of over 200 years at 75 degrees C. The modules thus operate in high ambient-temperature environments with low airflow.
All PKN 4000 Series converters feature over-voltage protection, over-temperature protection, current-limit protection, output-voltage adjust and local on/off. The single-output versions also include under-voltage detection, remote on/off and an alarm/control function. The dual-output versions include individual output voltage adjustment.
The PKN family complies with the requirements of EMC specifications, such as EN55022 and EN61000. It also conforms to EN60950 with 1,500Vdc isolation, meets the low-voltage directive 73/23/EEC and carries both UL and ULc approvals.
