Power Electronics / Power Management


AC-DC full-brick power supplies

28 April 2010 Power Electronics / Power Management

Complementing the PFE range of AC-DC full-brick power supplies, TDK-Lambda has introduced the PFE-S series with enhanced circuitry to improve lightning surge capability (up to 6 kV) and line interrupt hold-up time. Like the existing range, the PFE-S series combines the AC to HVDC front-end with DC-DC converter into a single standard-format, full-brick solution. In addition, the high efficiency of the units, which exceeds 83% in all versions, simplifies the thermal design of the equipment in which they are used.

The fully regulated PFE300S and PFE500S models are available in 12, 28 and 48 V nominal outputs and can be adjusted over a ±20% range. The 12 V versions deliver 396 W with a maximum base-plate temperature of 85°C, while the 28 V and 48 V models provide 504 W at 100°C base-plate temperatures (PFE500S). Line and load regulation is 0,4%.

The 12 V output models of these integrated 2-in-1 PCB-mounted power bricks are well suited for distributed power architectures because they can drive point-of-load (POL) converters directly. With no intermediate bus voltage needed, the use of multiple low-cost, non-isolated POL converters in conjunction with the combined AC-DC module offers cost savings and improved efficiency.

The semi-regulated PFE700S can deliver 714 W with a nominal output of 51 V and provides a very high efficiency (up to 89%) AC-DC stage for powering regulated DC-DC converters for multiple output applications – both parallel and series operation are possible. Maximum base-plate temperature is 100°C, derating linearly to 85% load above 85°C. Line and load regulation for the PFE700S is 4 V.

All versions of the PFE-S series have a wide-range AC input that allows operation from any voltage between 85 V and 265 V at 47 to 63 Hz. As standard, they incorporate active power factor correction and input-to-output isolation of 3000 V a.c. for one minute. Over-voltage, over-current and over-temperature protections are included. All PFE-S models are delivered with TDK-Lambda’s two-year warranty, are safety-approved to UL60950-1, CSA60950-1 and EN60950-1, and carry the CE mark.



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