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Qspeed Semiconductor introduced its Q-Series rectifier family. The new family of devices was designed specifically for use in power factor correction (PFC) circuits that deliver from 200 to 1000W of power.
The company claims that replacing an ultrafast diode with a Q-Series device typically realizes efficiency improvements of 0.5 to 1.5% in the boost converter stage, which are similar to those obtained by using exotic Silicon Carbide diodes. Developed using Qspeed’s proprietary technology, the Q-Series family of devices are said to have the lowest reverse-recovery-charge (QRR) and the best softness factor of any high-speed silicon rectifiers currently available on the market.
"Power supply designers no longer have to work around inferior diodes or use expensive Silicon Carbide devices," said Michael T. Robinson, CEO of Qspeed Semiconductor. "Our Q-Series rectifiers make it easy to improve the efficiency of PFC boost converters and lower MOSFET operating temperatures while minimizing EMI generation, all without the use of snubbers and clamps."
The Q-Series product family consists of three devices, which are rated to deliver continuous forward current values of 3, 5 and 8A respectively. The 3A device (LQA03TC600) would typically be used in boost converter stages that deliver from 200 to 400W of continuous output power. The 5A device (LQA05TC600) would find its home in converters that deliver from 400 to 700W, while the zone for the 8A device (LQA08TC600) is from about 700 to 1000W.
"Until now, engineers looking to improve the operating efficiency of their ac-dc power supplies had to resort to using costly, silicon carbide diodes," said Richard Francis, Qspeed’s Chief Technology Officer. "With the lowest reverse recovery charge and the best turn-off softness factor of any commercially available silicon rectifier, the Q-Series parts are being adopted faster than any new power semiconductor I have ever seen."
All three members of the Q-series family are currently available in high-volume production quantities. The 3A LQA03TC600 sells for $0.78 (USD) each, in fifty-thousand-piece quantities. The 5A LQA05TC600 is going for $0.88 each, in 50,000 piece lots. The 8 A LQA08TC600 is selling for only $1.08 each, in 50k piece orders.
