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Tyco quarter-brick dc/dc converter delivers 165W

Posted: 13 Aug 2002 ?? ?Print Version ?Bookmark and Share

Keywords:tyco electronics? qpw050? quarter brick converter? brick converter? dc/dc converter?

Exercising the muscle of several proprietary technologies, Tyco Electronics claims a big jump in power output and density for dc/dc converter quarter bricks with its QPW050, as well as higher reliability and lower cost.

"The QPW delivers 35 percent more power at more than a volt or two - in this case 3.3V - at up to 50A or 165W," said Sabi Varma, global director of marketing and operations. This equates to 25 percent gain in power density, to about 120W/inch3, over what was available just last year in the company's 3.3V QRW035 dc/dc module, easing the migration from many half-brick to quarter-brick designs.

Intended for telecom applications (nominal 48V input), Tyco's open-frame module delivers a full-load efficiency of 93 percent by virtue of its synchronous-rectification design, so in typical operation it requires no heatsink.

As for thermal-derating performance, the QPW050 delivers 30A at 700C (200lfm airflow). Operating at 300kHz, the quarter-brick features a worst case line-and-load regulation of 0.2 percent of output voltage and a maximum 50mV for temperature over -400C to 850C.

Maximum output ripple and noise is 20mV, and dynamic response is 0.2ms typical (at 250C for 50 percent to 75 percent load change). The output voltage adjustment trim is 110 percent, and output voltages are available down to 0.8V.

Monotonic startup to a prebiased output eliminates startup glitches. Overvoltage, overcurrent, and overtemperature protection are provided.

The QPW050 is priced at $89 each in lots of 1,000. Samples will be available this month; production volumes are scheduled for December.

Following on the heels of Broadband Telcom Power's HQ-series, which incorporates so-called flat-transformer technology for handling high currents (3.3V at 40A), the Tyco product is poised to further heat up quarter-brick activity.

These modules are being positioned as the most versatile of the brick formats to do the job of half-brick converters in half the size, serving in point-of-load or power-bus applications.

- Vincent Biancomano

EE Times





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