SMPS300RS 28V 110V power supply

SMPS Switch Mode Power Supply

The Connexelectronic Switched Mode power supplies (SMPS) are designed specifically for audio where the quality of DC voltage is of greatest importance for sound quality. They provide a very clean DC with minimal ripple/noise, much less than other industrial SMPS.

The SMPS300RS is very efficient with an efficiency from 89 to 93% depending on voltage model, when working at half load. This makes them run cooler and waste less power. They also benefit from a small form factor and low weight.
The SMPS300RS can output 300W continuous and 400W of peak power. Output voltage can be adjusted +-5 to 10% from its stock voltage.

SMPS300RS use state of the art, very efficient LLC Series Resonant Converter Topology. Due to the soft-switched topology used, the SMPS300RS has very low EMI noise, lower losses and is more compact than a similar power rating classic hard-switched SMPS.

Note: The SMPS requires to be connected to a load (the device you’ll power) for it to start and run correctly.

This is the single voltage version of SMPS300RS. There is also a differential, dual output version available. The SMPS300RE has two voltages, a +36V and a -36V (several voltages available).

If you need a higher output (single voltage) then you can look at the similar SMPS600RS.

Auxiliary output

There is also a lower power auxiliary power output with around 10.5 – 13VDC.
This aux output voltage is proportional to main output voltage (2/5 for 28V version (28V/5*2=11.2V) and 2/7 for 38V version(38/7*2=10.9).
If you adjust the main voltage +-10% then the aux voltage will follow.

Note: The max continuous current for the aux output should not exceed 500ma, and the total capacitance of the circuits connected to the aux output should not exceed 2200uF, otherwise the on board fuses might blow.

Specifications

• Input voltage: 110VAC (100-127V accepted)
• Output voltage: 28V DC (adjustable +-5% from 28V)
• Output wattage: 300W constant, 400W peak
• Ripple (noise): 23mV @ 1A, 68mV @ 8A
• Efficiency at 50% load: 90.5%
• Dimensions: 100x100x40mm
• Weight: 300 gram
• Model: SMPS300RS

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