SANTA ANA, CALIF. Broadband TelCom Power's S15 and S25 single-output dc/dc converters are touted as being among the smallest in class for distributed power, mobile telecommunications and Internet/network hardware applications.
The S15 family of 15-W modules, with a power density of 28.5 watts/cubic inch, has an extremely low profile (0.35 inch) and weight (28 ounces). The synchronous-rectified designs boast an efficiency of more than 90 percent so no heat sink is required.
"The S15 converters are designed to operate with no air flow in ambient temperatures between -40 and 60 degrees C with no power derating," said Broadband president James Lau. "These converters feature a six-sided metal shielding case that is so thermally efficient that no air flow or heat sink is required to operate at full load. With minimal airflow, the S15 can also be operated to 100 degrees C without derating." The 10-member S15 family delivers 2.5, 3.3, 5 or 12 V for a nominal 12, 24 or 48 Vdc input. Its mean time between failures is 850,000 hours at 50 degrees C.
The company's S25 25-watt synchronous-rectified converters, for Internet/network applications, deliver 2.5, 3.3 or 5 V for a nominal 24- or 48-V input. They measure only 2 by 1.2 inches by 0.35 inch. Competing conventional converters, Lau said, measure 2 by 2 inches by 1 inch, with efficiencies down by as much as 10 percent. These converters are compatible with standard Lucent (LW/LC) pin configurations. Power density (30 W/inch3), derating, and shielding specs are essentially the same as the S15.
Both the S15 and S25 feature input pi filters, input undervoltage lockout, output current limiting and short-circuit protection. Distribution pricing for the S15 begins at $23.40 per unit. The S25 begins at $35.10. Bulk discounts for both are available.
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EETInfo No. 635