Compact low power switching PSU for rack systems

April 2005 Operator Interfaces, Switches & Relays

Emerson Network Power is offering its LPQ173 switching power supply from Astec Power. With active power factor correction to minimise input harmonic distortion, the compact LPQ173 switcher accepts 85 to 264 V a.c. 120 to 370 V d.c. input and is suitable for 1U (1,75-inch) rack installations or other low-profile applications.

Providing up to 175 W with 30 CFM forced air or 110 W with convection cooling, this switcher is suitable for a wide variety of applications including: telecommunications, networking, test and measurement equipment, single-board computers, gigabit Ethernet devices and medical instrumentation.

Only 38,1 mm high, the LPQ173 has a trim footprint of 108 by 216 mm, and can be set up for lengthwise or crosswise airflow, giving designers layout flexibility. It includes a built-in Class B EMI filter, remote sense and single-wire parallel on the two primary outputs that enable current sharing to balance loads. The device also features overload and over voltage protection as well as thermal overload protection. LPQ173 models have an operating temperature range of zero to 50°C without derating and can function up to 70°C by derating each output 2,5%/°C.

With a quad output, the LPQ173 features adjustable voltages on three of the four outputs. It also provides two primary low-voltage, high-current outputs that are adjustable from 3,3 to 5,5 V. The unit features IEC EN61000-3-2 compliance, power fail and remote inhibit and low output ripple. The LPQ173 demonstrates a mean time between failures (MTBF) of over 550 000 hours at full load at 25°C ambient conditions while complying with worldwide safety and performance standards from UL, CSA, VDE, NEMKO, CB and CE.

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