XP Power Introduces Low Profile 400W ac-dc Switcher for 1U High ApparatusJuly 26, 2006 by Jeff Shepard
XP Power plc has announced the SMM400 series, a family of 400W ac-dc switching power supplies that enable more power to be delivered in an industry-standard 1U high enclosure. Most 1U units are limited to around 250W but this new power supply, which has power densities of up to 6.25W per cubic inch, meets demand for higher power within a given space. The low profile units come in 24 standard models -19 single-output and 5 dual-output versions - and carry agency approvals for communications, IT, industrial and medical applications.
The SMM400 has a universal 90 to 264Vac input with a choice of output voltages from 3 to 48Vdc. The primary output is user adjustable by ±5%. It has remote sense, power-good and remote on/off functions built in, with a current share function and ac fail signal offered as options. The unit is available in either U-channel or enclosed formats, with integral cooling. Over-current, over-voltage and over-temperature protection are included.
Screw terminals are standard and IEC or Molex input connectors, and Molex output connectors, are available as options. The integral fan version provides the 23 CFM cooling needed for full power operation and the units are rated at 250W with only convection cooling. The SMM400 operates in ambient temperatures from 0 to +50 °C at full power with derating to +70 °C.
Safety approvals include UL60950 and EN60950 for industrial and IT applications, and UL60601-1 and EN60601-1 for medical systems. The power supplies meet all major international EMC requirements. The SMM measures 9.01 x 5 x 1.6 inches with fan and cover, excluding the input screw terminal block, or only 8.0 inches long for the U-channel. It is available now and priced from $231 per unit for the single output versions, based on 1,000 pieces.