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Cherokee's quarter-brick delivers full output at 500C

Posted: 21 Feb 2002 ?? ?Print Version ?Bookmark and Share

Keywords:cherokee? quarter brick? dc/dc converter? quarter brick converter? brick converter?

The 1.2V to 3.3V, 30A quarter-brick dc/dc converters in Cherokee Int.'s Apollo series are said to perform efficiently at ambient temperatures to 50C.

"OEM design engineers need dc/dc converters that work efficiently at realistic operating ambient temperatures given the available airflow," said Mike Wagner, VP of marketing. The Apollo thermal-management strategy, he said, "delivers a true 30A current over practical ambient temperatures up to 50C with an available airflow, such as 200fpm, going across it."

The single-output, point-of-load converters deliver 36W to 100W from a nominal 48V input. They use synchronous rectification to achieve an efficiency of 90.5 percent at 3.3V. They are said to be suited for use in fast, high-current equipment for telecom, data communications, automatic test, and semiconductor fabrication.

Line regulation is 0.1 percent at full load, load regulation is 0.1 percent from no-load to full-load, maximum ripple and noise is 100mV peak-to-peak and settling time is 100?s for a 25 percent load step at 0.1A/?s. The converters are protected against overvoltage, overcurrent, and overtemperature.

The family, with 1.2, 1.5, 1.8, 2.5, and 3.3V outputs, is available in baseplate and open-frame versions (57.9-by-36.8mm footprint). Open-frame converters support tight, 15.24mm card-pitch telecom requirements. Pricing in lots of 1,000 is $59 each. The 3.3V converters are shipping now; 1.2, 1.5, 1.8, and 2.5V models are slated to ship within the first quarter.

EE Times

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