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Figure 2: Server PSU block diagram.  (Source: Texas Instruments)
Baby Boost Converter

How to Improve Power Density in a PFC Circuit

In the year 2000, server front end power-supply units (PSUs) – with an AC input to a 12-V/48-V DC rail – achieved around 10 W/in3 of power density, with about 85% peak efficiency. Today, so many server PSUs can meet 80 Plus Platinum (94% peak) and 80 Plus Titanium (96% peak) requirements that the latter requirement, along with very high power density (>90 W/ in3), are both now becoming minimum requirements.

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Figure 1: Comparison of market prices for 100 V GaN transistors and Si MOSFETs with similar on-resistance. (Bild: EPC)
Wide Bandgap Devices

Why GaN Devices are Superior to Silicon Chips

When has a new technology cleared the last hurdle of its introduction? When the Majority of votes supports the status quo. The conservative side, however, still tends to support old arguments, but those can lead to poor design decisions. That's the opinion of Alex Lidow, he is company co-founder of Efficient Power Conversion (EPC).

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