Nuprime SiGa Power75

NuPrime SiGa Power 75, external SiC and GaN power supply

A DAC, a streamer, a network switch: these low-voltage devices almost always come with a small generic mains adapter whose switching noise eventually makes its way into the signal. NuPrime tackles the issue head-on. The SiGa Power 75 pushes the switching frequency very high using silicon carbide and gallium nitride semiconductors, then cleans up what remains with active noise cancellation and careful shielding.

Silicon carbide and gallium nitride in tandem

The conversion section combines two families of so-called wide-bandgap semiconductors, capable of switching faster and withstanding higher voltages and temperatures than conventional silicon. Silicon carbide (SiC) is used for the Schottky diodes in the rectification stage: their reverse recovery charge is virtually zero, limiting the high-frequency spikes generated at each switching event. Gallium nitride (GaN) handles the switching itself, at over 500 kHz, with transient response on the nanosecond scale. The practical result is that voltage remains stable when current demand changes abruptly. The switching frequency is also well above the audio band, while efficiency rises to 93% at 12 V/5 A, with less heat to dissipate. The SiGa Power 75 is a switching power supply, but it targets the noise level usually expected from a linear unit.

Active common-mode noise cancellation

Common-mode noise is the parasitic component present identically on both conductors relative to ground; it is often what couples into sensitive digital circuits and masks low-level detail. The SiGa Power 75’s CM-ANC circuit continuously monitors it and injects an out-of-phase corrective signal to cancel it, across a wide bandwidth extending up to 1 MHz. The effect is measurable: residual ripple and noise remain below 2.5 mVrms across the 10 Hz-110 kHz range, and on the 12 V line, typical ripple falls below 1 mVrms when cancellation is active, compared with 2.5 mVrms when it is switched off. A front-panel control is used to activate or deactivate it.

Six outputs to power a digital system

Whereas an ordinary mains adapter delivers only one voltage, the SiGa Power 75 offers six outputs: four 12 V outputs up to 5 A on 5.5 × 2.5 mm DC connectors, and two 5 V outputs up to 3 A on USB Type-A ports. The combined power of the entire unit does not exceed 75 W. A single enclosure can therefore power several elements of a digital system at once: a network switch, a streamer, a converter, a reclocker, as long as the total remains within the 75 W limit. This reserve must be distributed among the connected devices, which the front-panel display helps monitor.

A display for reading voltage, current and power

Few external power supplies show what they deliver. The SiGa Power 75 incorporates a display that indicates voltage, current and power consumption in real time, allowing each output to be checked and the total to remain below 75 W. It is accompanied by two controls: a DIM setting to adjust or dim the display brightness, and a dedicated button for active noise cancellation.

Bronze shielding and low-impedance energy reservoir

The GaN module is enclosed in bronze shielding. This metal combines conductivity, mass and damping properties: it blocks radio-frequency interference and dampens mechanical resonances, while limiting interactions between the various internal modules. On the storage side, a two-stage, high-quality-factor energy reservoir separates the rectification stage from the regulation stage. Output impedance remains low, voltage holds up better against load variations, and residual ripple as well as downstream timing errors (jitter) are reduced. Polymer capacitors and filtering circuits complete the cleanup. The metal enclosure remains compact, measuring 95 × 170 × 60 mm and weighing 1 kg, with four self-adhesive rubber feet and a one-year warranty.

Compatibility with NuPrime and third-party devices

The 12 V outputs use 5.5 × 2.5 mm DC connectors, whereas NuPrime devices equipped with a 12 V input use a 5.5 × 2.1 mm connector. Two 5.5 × 2.5 to 5.5 × 2.1 mm adapter cables are therefore supplied: they cover the CDT-9 and NuPrime-X modules (H16-AIP, H16-AES, AoAES-F22D, AoANA-F04A). Devices with a USB-C input, such as the LP10 NuPrime Edition, WR-2, Arc Mini, Stream Mini and Stream Mini DAC, connect using a USB-A to USB-C cable, which must be purchased separately as it is not included in the box. A device from another brand will also work, provided its voltage, current and connector match one of the outputs. The package includes the two DC cables, a mains power cord and the four adhesive feet.

Technical Specifications

Overview

• Ultra-low-noise AC / DC mains power supply
• Converts 100–240 V AC mains power into stable, regulated DC voltage
• Total maximum power: 75 W
• Regulated outputs: 12 V DC and 5 V DC
• Designed for digital audio equipment and low-voltage electronics sensitive to power quality

Conversion Technologies

• Hybrid SiC / GaN architecture
  • Combination of Silicon Carbide (SiC) and Gallium Nitride (GaN)
  • Each technology optimizes a specific conversion and regulation stage
  • Fast, efficient, low-loss conversion
• SiC Schottky diodes
  • Virtually zero reverse recovery charge
  • Reduced high-frequency spikes generated during switching
• High-speed GaN transistors
  • Very high-frequency switching
  • Fast response to load variations
• Switching frequency above 500 kHz
• Efficiency up to 93% at 12 V / 5 A
• Ultra-fast transient response to maintain stable voltage during load variations
• Better control of thermal dissipation

Noise Reduction and Isolation

• CM-ANC technology (active common-mode noise cancellation)
  • Monitoring of common-mode noise and generation of a phase-opposed corrective signal
  • Wide operating bandwidth up to 1 MHz
  • Reduction of EMI / RFI interference on power lines
• Bronze RF shielding
  • Dedicated isolation of the GaN module against radio-frequency interference
  • Limits interactions between the various internal modules
• Module isolation to reduce unwanted coupling between power circuits
• Multi-stage filtering combining polymer capacitors, filters and low-impedance energy reservoirs
• Low-impedance energy reservoir
  • Two-stage energy storage architecture
  • Maintains stable power during load variations
  • Reduces ripple and high-frequency interference
• Low output noise: ripple & noise below 2.5 mVrms across the 10 Hz–110 kHz audio range
• Typical 12 V ripple: below 1 mVrms with ANC enabled

Monitoring and Controls

• Real-time power monitoring with integrated display
  • Voltage
  • Current
  • Power consumption
• DIM setting: dedicated control for adjusting the display
• ANC control: convenient activation / deactivation of active noise cancellation

Outputs and Connectivity

• 4 x 12 V DC outputs up to 5 A
  • 5.5 × 2.5 mm DC connectors
• 2 x 5 V DC outputs up to 3 A
  • USB Type-A connectors
• Combined power of all outputs limited to 75 W

Compatibility with NuPrime Devices

• Compatible in particular with DACs, streamers, network switches, routers, reclockers and digital processors
• NuPrime devices with 12 V DC 5.5 × 2.1 mm connector
  • CDT-9, H16-AIP, H16-AES, AoAES-F22D, AoANA-F04A
  • Use the supplied 5.5 × 2.5 mm to 5.5 × 2.1 mm cable
• Devices with USB-C input
  • LP10 NuPrime Edition, WR-2, Arc Mini, Stream Mini, Stream Mini DAC
  • Use a USB-A to USB-C charging cable

Applications

• DACs and digital converters
• Network streamers
• Ethernet switches
• Routers
• Reclockers
• Digital processors
• High-resolution audio equipment
• Low-voltage electronics sensitive to power supply noise

Technical Specifications

• Maximum power: 75 W
• Outputs: 12 V DC / 5 V DC
  • 12 V: up to 5 A per output
  • 5 V: up to 3 A per output
• Efficiency: up to 93% at 12 V / 5 A
• Ripple & noise: below 2.5 mVrms, 10 Hz–110 kHz
• Typical 12 V ripple with ANC enabled: below 1 mVrms
• Typical 12 V ripple with ANC disabled: 2.5 mVrms
• Switching frequency: above 500 kHz
• Power technologies: SiC + GaN
• Dimensions: 95 × 170 × 60 mm (W × D × H)
• Weight: 1 kg
• Package dimensions: 150 × 210 × 95 mm (W × D × H)
• Packaged weight: 1.6 kg
• Warranty: 1 year

Included Accessories

• 2 x 5.5 × 2.5 mm to 5.5 × 2.1 mm DC power cables
• 1 AC mains power cable
• 4 self-adhesive rubber feet