2:1 input DC/DC converter for POE applications

14th March 2014
Nat Bowers

An open frame eighth-brick DC-DC converter, the CPE1U48 "Cool Power Technologies" DC/DC converter, has been announced by Semiconductor Circuits. Conforming to industry standard specifications, the converter operates over an input voltage range of 36-72V DC, and provides a tightly regulated output voltage with an output current rating of 1.25A.

Output voltage is nominally 48V DC and can be adjusted to suit a variety of Power over Ethernet (PoE) applications. The output is fully isolated from the input and the converter meets Basic Insulation requirements. The standard feature set includes remote On/Off (positive or negative enable), input under-voltage lockout, output overvoltage protection, over-current and short circuit protections, output voltage trim, remote sense and over-temperature shutdown with hysteresis.

The high efficiency of the CPE1U48 allows operation over a wide ambient temperature range with minimal de-rating (full rated power at 70°C and 200LFM (1m/s) airflow at 48Vin.).This new PoE optimised product is a member of the Cool Power 1/8th Brick Family. It is compliant with DOSA footprint and interface standards and provides 2250V DC input to output isolation. Custom values are also being manufactured to match varied voltage requirements in PoE products.

The CPE series is a high efficiency module product family with efficiencies exceeding 90% from ½ load through full load. They meet EN 60950 basic insulation requirements and are UL94 V-0 flammability rated. Safety certification by TUV has been granted for most members of the family and the remaining ones are in the certification process. The modules comply with typical industry requirements including no load operation, two times nominal input voltage transient and pre-biased load startup.

Other features include: fixed-frequency operation, auto-restart OVP, OCP & OTP protections, UVLO, remote sense and +10%/-20% output voltage trim using industry standard equations. Remote ON/OFF is standard with positive or negative logic options available. This product set features standard 1/8th brick pin-out and dimensions of 58.4x22.9mm (2.3x0.9”). It has a maximum height of 10.3mm (0.404”) which accommodates tight card spacing with minimal airflow blockage of downstream components.

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