Introduction:

S50-MKI Fully Discrete topology Single-pass, series regulator design.

No IC (integrated circuits) are used. This allows complete design control over all operating points and parameters for superior performance.

 

Low noise, high PSRR a constant-current source feeds a zener diode as a stable voltage reference. A low-pass filter (with a corner frequency of 1.6Hz) prevents zener noise from being introduced into the error amplifier. This is an effective yet lower-cost alternative to expensive voltage reference ICs. The low-pass filter also provides a soft-start characteristic.

 

The output noise (unloaded) is less than 13µV at 24VDC output (measured using a Tangent LNMP (low-noise measurement preamplifier) and a Fluke 187 50000-count DMM in ACmV mode). The output noise is even less when the output voltage is lower. This is much better than the noise of an IC regulator based PSU tested under identical conditions.

 

The error amplifier is a discrete implementation of an opamp with a high open-loop gain of 102.5dB. The voltage supply to the error amplifier is isolated with capacitance multipliers to boost its PSRR (power supply rejection ratio). This greatly improves the line regulation performance of the PSU.

 

A long-tailed pair differential amplifier with current mirror and onstant current source forms the first stage of the error amplifier. The second stage is the voltage amplification stage (VAS), also with constant current source load. The 3rd stage is comprised of the power MOSFET output devices configured as a source follower.

 

High-current MOSFET pass transistors Two paralleled high-current, highly reliable MOSFETs (rated at 18A each) serve as the "pass" transistor.

 

The high current rating provides a very high safety headroom against overcurrent damage.

 

The use of paralleled MOSFETs divides the heat dissipation, simplifying thermal management. Onboard heatsinks can be used which would allow the σ11 to supply up to 1A continuous (with much higher peak currents). More sustained currents are possible by using larger, offboard heatsinks.


 

The transformer supply voltage corresponding to the DC output voltage is as follows;

DC 5V ------ Use transformer output voltage AC 12V

DC 9V ------ Use transformer output voltage AC 15V

DC 12V ------ Use transformer output voltage AC 18V

DC 15V ------ Use transformer output voltage AC 20V

DC 19V ------ Use transformer output voltage AC 24V

DC 24V ------ Use transformer output voltage AC 27V

We also accept customized voltages, if you need other DC voltages, please contact us. At the same time, we also have more HIFI DC cables, if you need them, you can go to my store to buy them.


 

NOTE 1: We have DIY kit or finished board (Optional)

◆ DIY kit ---- All parts need you to solder and test it.
◆ Finished board ---- All parts have been welded and tested OK.


 

NOTE 2: The default setting current of this board is 2A (the transformer is at least 50W), and it can be directly installed on the chassis bottom plate to dissipate heat through the bottom plate. (If you want to use a larger current output, but also need to increase the power of the transformer, Replace the case with a heat sink, it will be up to you, usually 3A at least use heat sink weight not less than 1KG).