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Does this mean my device has a switching power supply inside it?

75.142.52.0
Posted on April 5, 2024 at 23:31:04
mike1127
Audiophile

Posts: 341
Joined: June 3, 2009
 I just bought an iFi Zen Stream and I have a really high quality 12V LPS lying around so I powered it with that. (It says takes anywhere from 9V to 15V.) Sounds pretty good.

I suspected it had to regulate the 12V down to 5V because inside is an ARM chip.

I just noticed this verbiage on the iFi website: it contains a "synchronous 1.5MHz high-speed power supply controller for even great noise reduction and even less distortion."

Does that mean it's regulating the 12V down to 5 with a switching power supply? Arg. Maybe the LPS is providing no benefit if the first thing the circuitry does is inject 1.5 MHz noise into the whole chassis.

I have a SMPS that came with the Zen, so I'll try that too and see if there's any difference.

 

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how about Raspberry Pi's..., posted on April 5, 2024 at 23:35:00
mike1127
Audiophile

Posts: 341
Joined: June 3, 2009
 I'm exploring the use of a Raspberry Pi as a network stream instead of the Zen. That leads me to wonder if RPis have any switching-based voltage regulation inside them. If you get an LPS for a RPi, does it mean that all voltages inside the RPi don't use switching?

 

Yes, yes it does., posted on April 7, 2024 at 10:52:17
Chip647
Audiophile

Posts: 2686
Location: The South
Joined: December 24, 2012
 "The UC28023 and UC28025 are fixed-frequency PWM controllers optimized for high-frequency switched-mode power-supply applications. The UC28023 is a single output PWM for single-ended topologies while the UC28025 offers dual alternating outputs for double-ended and full bridge topologies.

Targeted for cost-effective solutions with minimal external components. UC2802x devices include an oscillator, a temperature compensated reference, a wide bandwidth error amplifier, a high-speed current-sense comparator, and high-current, active-high, totem-pole outputs to directly drive external MOSFETs."

 

RE: how about Raspberry Pi's..., posted on April 8, 2024 at 13:10:33
Chip647
Audiophile

Posts: 2686
Location: The South
Joined: December 24, 2012
 looking at the raspberry pi schematic, it looks like it is using DC-DC converters rather than ultra LDO voltage regulators for the 3v. Gilding a lily only kills it.

 

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