“True 150W” AC/DC power supply in 2 x 4-in. format
These high efficiency open frame AC-DC power supplies carry approvals for industrial, IT and medical applications. The series comprises seven single-output models that offer a range of standard output voltages from +12 VDC to +48 VDC. A secondary 12 VDC / 0.5 A fan output is provided across the range. The low-profile ‘1U’ footprint has a 1.26 in. (32.3 mm) profile making it, the company says, simple to integrate. The series has a convection-cooled output power rating of 150W which XP claims is best-available for a power supply of this footprint; “150W in that space is leading-technology,” an XP spokesman commented. Output power of up to 225W is available with 10 CFM of forced airflow.
The EPL225 series offers a minimum average efficiency of 93% and a maximum efficiency of 95% resulting in less heat to dissipate and a cooler running unit, the later contributing to a more reliable longer-life power supply. The units maintain efficiency down to low power levels, still performing at over 90% down to around 20% of full load. XP re-iterates the point that incremental gains in efficiency represent significant reductions in waste heat.
The supplies’ full output is available over the specified range of of 90-264VAC input; derating only applies if the line voltage drops below 90V, down to 80V. Similarly, the units operate over -20 to +70C with no derating until +50C. In practice, XP says, this simplifies a specification process where the designer initially requests a given size and power rating supply, but is compelled to move to a higher-rated, or larger, unit to ensure operation at the limits of voltage or temperature – this is the justification for XP’s description of the units as “true” 150W. The units’ “green” attributes include a no-load power consumption of less than 0.5W enabling compliance with the latest environmental goals and legislation.
The series meets the 5000m altitude operating specification and complies with the universal safety standard EN 60950-1 for IT equipment in addition to the medical safety standards ANSI/AAME/ 60601-1 and IEC/EN60601-1 3rd edition. With low conducted and radiated noise the units meet the standards EN55011 & EN55022 for Class B conducted and Class A radiated EMI specifications.
The topology of the supply employs active power-factor correction, with a two-stage conversion section and synchronous rectification. The PFC is a transition mode variable frequency boost converter; the main converter uses zero-voltage switching for low noise, and is a L-L-C variable frequency resonant half-bridge design. This combination XP says, “enables very high active mode efficiency, low power dissipation and low no load power.”
The EPL225 is available at 12, 15, 18, 24, 28, 36 & 48 VDC output; XP’s spokesman notes that, “36V is becoming increasingly popular to run small motors [within equipment]; 24V is the most popular option; and 18V is widely specified for IT equipment designs.” The series is available from Farnell, element14, Digi-Key, and regional distributors, or direct from XP Power, and carries a 3 year warranty. All voltage outputs are identically priced with guide pricing of €98 per unit (at 500 units).
XP Power; www.xppower.com
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