Introduction
Low noise VanityPRO power supply
This very low noise linear power supply is specially designed for the VanityPRO digital audio-extractor, but can also be used as a universal linear power supply. The VanityPSU has three independent power supply rails, two with 5V and one with 12V output. Each 5V rail has two USB connectors USB-A and USB-C and each connector has its own secondary regulator. The 12V output has a standard 2.1mm DC connector. All outputs are fully protected against overvoltage, overcurrent and short circuits. The housing design matches that of the VanityPRO.
The unique feature of the VanityPSU-power supply is the two-stage linear control and each output is controlled separately. Both controller stages are discrete designs, with the second being extremely low noise, which has not been seen before in stand-alone power supplies.
When the de VanityPRO is powered, the additional 5V outputs can be used to power other HDMI devices such as splitters or selectors, while the 12V output can power a DAC, network switch or other equipment that requires a 12V/1A power input.
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Features
Three independent galvanically isolated power rails
The VanityPSU has three independent rails. Two with 5V and one with 12V. audiodelen. This is in support of one of the key features of the VanityPRO, which has galvanic separation between the HDMI and audio parts. The VanityPSU allows both parts to be powered without creating a ground connection between them.
Two stage linear regulation
Unlike other linear power supplies on the market, the VanityPSU has two regulation stages. Both are designed completely discreetly without the use of a monolithic controller.
The first stage creates a stable DC voltage after the rectifier to eliminate ripple, while the second stage is of the ultra-low noise type to regulate the output voltages. The use of a two-stage scheme has two effects. The first is that the output voltage has virtually no residue from the AC component of the mains, the broadband noise level is extremely low, and the stability of the output voltage is rock solid.
The second effect has to do with the fact that linear control is much less efficient than switching control. With two linear control stages, there are more thermal losses than with one, despite the fact that both stages are highly optimized to minimize these losses. The Vanity
PSU
is no record breaker when it comes to output power. Although all outputs have a rated output current of 1A, the total output power is limited and the power is reduced for various combinations of output loads, just like all other linear power supplies.
Very Low Noise
Many linear power supply manufacturers claim that their products offer ultra-low noise, ultimate clean power, superior performance and the like, without providing technical parameters that support such claims. The best you can get is a part number of a used integrated regulator, but that in itself says nothing about how the whole product will perform.
We built a test system consisting of a battery-powered low-noise 60dB AC amplifier, audio analyzer, and associated cabling and shielding to enable the Vanity
PSU
properly measured and optimized. The entire test system has its own noise contribution less than 1µVRMS in the bandwidth of 10Hz to 95kHz. Below you can see noise spectrum plots comparison between the VanityPSU and a common multi-port USB charger, both driving a resistive load at 5V and 0.5A.
The difference in noise level is staggering 54.3dB, which is about 520 times better in favor of the VanityPSU.
Technical specifications
AC-input
- 115V or 230V AC user selectable, 50Hz/60Hz
- Filtered IEC C14 socket with ON/OFF switch
- Internally fused 1A medium blow
- Maximum input power 50W
- Class 1 appliance
DC-Outputs
- Five DC outputs
- Outputs 1+2: 5V DC USB-C+USB-A, 1A max combined
- Output 3: 12V DC barrel jack 2.1mm, 1A max
- Outputs 4+5: 5V DC USB-A+USB-C, 1A max combined
- Output voltage accuracy (all outputs): max ±1%
- Load regulation (all outputs, 0-1A): max ±2%
- Noise – outputs 1,2,4,5 (5V): <4µVRMS 10Hz-95kHz @1A
- Noise – output 3 (12V): <5µVRMS 10Hz-95kHz @1A
Power Derating
- Total output DC power should not exceed 15W
- Outputs 1+2 have combined 1A limit (0.5A each)
- Outputs 4+5 have combined 1A limit (0.5A each)
- Outputs 1+2+4+5 have combined 1.6A limit (0.4A each)
- Output 3 load must observe total output power limit
Dimensions & Weight
- w/d/h: 10.5/7.2/2.6 inch, including the output connectors
- weight: 5.5lbs
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