TDK uses GaN PFC to shrink 500W ac-dc power brick

TDK has moved to GaN transistors to reduce the size of its 504W ac-dc power supply, which has a 101.6 x 61mm footprint. Within the TDK-Lambda-branded PFH500F‑28, a pair of GaN transistors have been used in a ‘bridge-less’ front-end power factor correction stage, raising efficiency in the PFC stage to 98.6% and peak efficiency of the ...

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Recom free ac-dc PSU book is good

Power supply firm Recom has released a book on ac-dc power supplies, that can be downloaded free. Written by the firm’s technical director Steve Roberts, it is called ‘AC/DC Book of Knowledge’. Electronics Weekly spent a while looking through it, and gives it a thumbs up. Not only a good introduction to topologies for PFC, ...

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Tiny SiTime silicon MEMS resonator hits 5ppb accuracy for 5G infrastructure

Mems oscillator from has announced devices that can achieve 5ppb (parts/billion) frequency accuracy, and shun both thermal variation and vibration. The devices are based on 100ppb parts released two years ago and, despite now including an oven, measure 7 x 9 x 6.5mm. The firm is aiming frequency provision in 5G infrastructure, where many mini-basestations ...

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GNSS timer for 5G

In February, u-blox intends to sample a GNSS timer that meets  the  timing synchronization requirements in 5G mobile networks. Although previous generation of cellular networks have already been using GNSS time as primary source of synchronization, better synchronization throughout the network will be a key enabler for 5G. The 5G cellular network will require tighter ...

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Q3 semi sales up 13.8%

Q3 IC  sales were up 4.1% on Q2 and up 13.8% up on Q317 at $122.7 billion, reports the SIA. September sales were up 2% on August at $40.9 billion. “Three-quarters of the way through 2018, the global semiconductor industry is on pace to post its highest-ever annual sales, comfortably topping last year’s record total ...

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Wafer supply tight through 2020

8-inch and 12-inch wafers will be in tight supply into 2020, says Doris Hsu, chairperson of the third largest wafer vendor GlobalWafers, reports Digitimes. Prices are likely to rise in 2019 particularly for eight inch float zone (FZ) and SOI wafers. 8 and 12 inch wafers account for 80-90% of the company’s existing capacities. The US has ...

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Tablets keep sinking

Q3 saw the tablet market decline 8.6%,  says IDC, extending the sequential decline to sixteen quarters. Huawei was the only company in the top five to ship more tablets than the year before. The top five vendors accounted for 68.4 percent of the market, up from 67.1 percent last year.     Apple’s shipment numbers ...

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