AC-DC full-brick power supplies improve surge protection

TDK-Lambdavisit website


Following the success of the PFE range of AC-DC full-brick power supplies, TDK-Lambda is introducing the PFE-S series with enhanced circuitry to improve lightning surge capability (up to 6kV) 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 full-brick format. In addition, the high efficiency of the units, which exceeds 83 per cent in all versions, greatly simplifies the thermal design of the equipment in which they are used.

Fully regulated PFE300S and PFE500S models are available in 12, 28 and 48V nominal outputs and can be adjusted over a +/-20 per cent range. The 12V versions deliver 396W with a maximum base-plate temperature of 85degC, while the 28V and 48V models provide 504W at 100degC base-plate temperatures (PFE500S). Line and load regulation is 0.4 per cent.

12V output models of the integrated two-in-one PCB-mounted power bricks are suitable 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 significant cost savings and improved efficiency.

TDK-Lambda’s semi-regulated PFE700S can deliver 714W with a nominal output of 51V and provides a very high efficiency (up to 89 per cent) 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 100degC, derating linearly to 85 per cent load above 85degC. Line and load regulation for the PFE700S is 4V.

All versions of the PFE-S series have a wide-range AC input that allows operation from any voltage of 85-265V at 47-63Hz. As standard, they incorporate active power factor correction and input-to-output isolation of 3000V AC 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 UL 60950-1, CSA 60950-1 and EN 60950-1, and carry the CE mark.

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