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Flex Power launches 16-160V DC-DCs


150W DC/DCs have 10:1 input range and extended hold-up feature

Flex Power Modules is launching the PKM7200W series of DC-DC converters with an ultra-wide input range of 16-160 V (185 V/1 sec), for world-wide rail applications. In a case size of 62 x 40 x 13 mm (2.44 x 1.57 x 0.51 inch) the products provide 150 W continuous output power and 12 V, 24 V or 54 VDC fully regulated single outputs.

The parts achieve up to 89 percent efficiency and feature 4 kVDC isolation, meeting the requirements of EN 50155 for rail, as well as IEC/EN/UL 62368-1 for IT and audio/visual applications.

The PKM7200W series has the novel feature of a VBUS pin, an input-referenced connection that is boosted to around 100 V, irrespective of the input voltage. This can be used to charge a user-supplied capacitor which the DC/DC switches in when the input power is interrupted. The feature enables long hold-up time with a relatively small capacitor, to meet the 10 – 30 ms requirements of EN 50155.

The products are compliant with the rail fire safety standard EN 45545-2 and have been qualified to EN 61373 and the IEC 60068 series of standards for environmental testing. EN 50121-3-2 for EMC in rail applications is met, as well as EN 55011 and the EN 61000-4 series of standards for EM immunity. EMI conducted emissions meet EN 55032, CISPR 32 and FCC part 15J ‘Class B’ with an external filter.

The PKM7200W series operates from -40° C to +100° C baseplate temperature with derating, depending on attached heatsink and airflow. Typically, the parts provide full load with a 20 mm attached quarter-brick heatsink up to 60° C ambient air temperature in natural convection and to around 90° C with 3 m/s airflow.

The PKM7200W has a programmable input under-voltage lockout, remote control, output trim and remote sensing. Comprehensive protection includes over-temperature, and output short-circuit, over-voltage and over-current.

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