Specifications

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22
High Power Switching
DC Power Supplies
Models VSP2050 (20VDC/50A),
VSP4030 (40VDC/30A),
VSP6020 (60VDC/20A),
VSP12010 (120VDC/10A)
High-power, low-noise Switching DC Power Supplies
The VSP Power Supplies utilizes modern switch mode technology to produce high-power, low-noise switching
supplies that cost around 25 percent less than linear supplies with the same power which offers as much as 1.2
kilowatts in a 19-inch rack mountable chassis that measures just 1U (1.75 inches) in height.
The many outstanding features of the VSP DC Power Supplies are:
■ Precise output voltage control via:
1. manual tuning utilizing front panel mounted ten-turn potentiometers and three-digit meters
2. Remote control from an RS-232 Interface or GPIB Interface (Add “GPIB” to model number)
3. Analog remote sensing automatically maintains desired voltage at load level of power cable.
■ Provides 1.2 kilowatts at 20V, 40V, 60V or 120V output voltages
■ Compact 1U (1.75 inch by 19 inch rack mountable chassis)
■ Up to nine units can be cascaded, producing more than 10 Kilowatts of DC power.
■ Front-to-back air flow allows full power operation even when stacked.
The new power supplies pack as much as 1.2 kilowatts into a 19-inch, rack-mountable box that measures just 1U
(1.75 inches) in height. Furthermore, the VSP Power Supply achieves an energy conversion efficiency of 80%,
while keeping noise levels under 20 millivolts.
Behind the performance advantages of the VSP series are advances in switching techniques. Two are particularly
significant, soft switching, and two-device asynchronous half-bridge DC to DC
converter design. The soft switching technique is a vital step for reducing switching noise. The technique ensures
that the switching action will occur when the voltage across the switching device is at a minimum. By turning the
switching device on and off in the converter when there is little voltage across it, the transformer load does not
see sharp voltage transients. Eliminating that transient gets rid of much of the high-frequency system noise that
would otherwise propagate through the transformer to the output stage. It also helps reduce the noise that
typically feed back to the source. A built-in RFI filter further reduces power line noise, allowing the supplies to
meet EN55022 Class A standards.
The VSP series further reduces noise by using a "piggy back" linear regulator to follow the conversion stage. The
total effect is to improve the transient response to the changes in load and to reduce output noise and ripple
from the DC converter. Along with controlling output noise, the converter and regulator allow the VSP series
devices to offer precise output voltage control.
Stackable & Rackable
Now you
can have
power without
the noise