P801 Power Amp

[Alan March]

Thanks for that Alan, that's understood but unless Micro Audio have made a mistake with their documentation, they advertise their SMPS1K-PFCR2 (erroneously listed as the SMPS1K-PFCR3 in the documentation) & SMPS1K-SN as "unregulated" as you can see below, perhaps the owner Sami has made an error with his documentations but not too sure about that.
View attachment 411
View attachment 412

Hence my careful use of the word effectively.

The earlier models use feedback within the switching circuit to provide loose regulation. Which is actually quite effective compared to the performance of the Hypex design. However it will struggle with reactive load bus pumping. So possibly a bad description on my behalf, it's not fully regulated.

The lower voltage rails are fully regulated with traditional 3 pin linear regulators.

The later designs improve on this with the bus pumping control techniques that regulate the main high voltage rails.

 

[Alan March]

As an aside to this, we do continually look at the design options for our products and operate a continuous improvement policy. As such components will change when we feel it's beneficial to do so.

 

[SmartOne_2000]

@Alan March, thanks for the clarifications, Alan ... so, to summarize the capabilities of the P801, its power supply (designed by whoever) is fully regulated on all positive and negative rails, has no issues with bus pumping, and is a 4-quadrant design? And its line regulation spec <= 1% so as to make its main output DC voltages fully invariant to input mains fluctuations? Similar specs for load regulation into 8/4/2 ohm loads?