So what's happening in medium-sized power supplies? These days,
the power output is the only thing that's medium-sized as these smaller
devices provide more power density.
Aimed primarily at the telecom market, XP Power's 12-, 24-, and 48-V dc
output MFA350 may hold the current
record for the world's smallest 350-W
supply, cranking out 11.2 W/in.3 in its
base version. That's 364 W across the
entire 90- to 264-V ac input range from
a 3.2- by 6.8- by 1.5-in. U-bracket package (see the figure).
A 48-V dc input version is additionally
available. Outputs include 12 V at 1 A for
a fan and 5 V at 0.3 A for standby power. The fan requirement is a modest 13 cubic
feet/minute (CFM). Available now, the
MFA350 costs $175.00 in OEM lots.
The slightly larger Emerson Network
Power Astec NTS503 universal-input 12-V
supply boasts 500 W and 11.9 W/in.3 The
tradeoff for the extra 150 W is cooling-air
volume: 30 CFM. With only convection
cooling, maximum output is 200 W. Both
versions provide an auxiliary "always-on"
regulated 5 V dc at 2-A output for applications that need standby operation and a
12-V output for powering fans.
Now that Emerson has acquired
Artesyn, it's no surprise that control and
telemetry comply with the PMBus standard. The NTS503 can monitor temperature, output voltage, and current with limited (5% either side of nominal) control of
VOUT. Pricing starts at $299 for ITE/industrial models and $325 for medical models, in production quantities.
In a similar but deeper 1U/2U configuration (10.25 in.), Excelsys Technologies'
Xlite series delivers up to 600 W at 10.5
W/in.3 Three different chassis provide system power levels of 200, 400, and 600 W.
These chassis may be populated with any
combination of four output modules from
a range of seven types offering nominal
outputs from 2.5 to 48 V dc. All of the output modules may be user-adjusted over a
wide range to meet end-system requirements. For pricing, contact the company.
Astec Power
www.astec.com
Excelsys Technologies
www.excelsys.com
XP Power
www.xppower.com