SMPS300RE +-45V (dual voltage) 115V 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 SMPS300RE is very efficient with an efficiency from 89% to 93% depending on voltage model, (measured at half load). This makes them run cooler and waste less power. They also benefit from a small form factor and low weight.
The SMPS300RE can output 300W continuous and 400W of peak power. Output voltage can be adjusted 10%. That means +-5% in each directly from the factory set voltage.

SMPS300RE use half-bridge, resonant topology with dual CLC filter on the output and compact profile transformers.  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 differential, dual output version. There is another model, the SMPS300RS that has a single DC voltage output.
You can not use only a single of the voltages from a SMPS300RE. It should only be used with devices that require a differential +- DC input. Note the total voltage between for example +-45V is 90V.

If you need a higher output dual voltage SMPS then you can look at the SMPS500R, or SMPS800RE.

This power supply is suitable for both class AB and class D/T amplifiers, which have the PSRR greater or at least 57dB.

Target applications for this power supply unit include the TA2022 based amplifiers, TDA8920 or TDA8950 based amplifiers and IRS2092 amplifiers for the +-27V or +-36V version as well as other vendors amplifiers such as Hypex UCD180 Amplifier modules, TK2050 amplifiers or TDA7293/4 amplifiers.

Auxiliary output

There is also a lower power auxiliary power output with around +-10.5 – 13VDC (also differential).
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: 115VAC (100-127V accepted)
• Output voltage: Dual +-45V DC (adjustable +-5% from 36V)
• Output wattage: 300W constant, 400W peak
• Ripple (noise): 40mV @ 1A, 97mV @ 8A
• Efficiency at 50% load: 92.2%
• Dimensions: 100x100x40mm
• Weight: 300 gram
• Model: SMPS300RE

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