78xx pin compatible OpAmp-based MOSFET series regulator

ahiukka · 24th December 2009, 12:51 PM

This regulator has been an on-off project, for over half a year and I think its time to "publish" it now.

It is basically a sulzer regulator with led reference and MOSFET pass transistor. Personally I use "logic level" type of International Rectifiers' "HEXFET" in TO-220, for the lower drop-out voltage. MOSFET is located on bottom side facing the PCB.
OpAmp needed is one huge question mark for me... In Proof-Of-Concept prototype I used recycled AD820. For some OpAmps R5 is not needed to operate(for AD820 it was).
R1 and R2 (and resistor "16" if needed for trimming) set the output voltage according to two led reference. Unmarked capacitor is, if needed, located on the bottom side on the lower section of the reg.

The PCB is designed with OrCAD, and the slightly PhotoShopped design is measured 30x11mm. All passives and leds are 0805. 600dpi, mirrored (ready for toner transfer) images are included. The hole for MOSFET's screw is diameter of 6mm.

Not sure what this design is capable of, as I don't have needed measurement equipment. I hope that, someone with sufficient gear, would construct and measure the design properly.

-Antti Kiuas

luka · 24th December 2009, 02:36 PM

nice, have you made any yet?

ahiukka · 24th December 2009, 02:50 PM

Yes, I made a bit larger (36x11mm) Proof-Of-Concept prototype using Maxim's voltage reference. It does output 5VDC, that's all I can say.

-Kiuas

stormsonic · 24th December 2009, 03:34 PM

Remindes me on this
Ultra-Low-Noise LDO Achieves 6nV/√Hz Noise Performance - Maxim

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24th December 2009, 02:36 PM	#2
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	nice, have you made any yet?

24th December 2009, 02:50 PM	#3
ahiukka diyAudio Member Join Date: Apr 2006	Yes, I made a bit larger (36x11mm) Proof-Of-Concept prototype using Maxim's voltage reference. It does output 5VDC, that's all I can say. -Kiuas

24th December 2009, 03:34 PM	#4
stormsonic diyAudio Member Join Date: Aug 2008	Remindes me on this Ultra-Low-Noise LDO Achieves 6nV/√Hz Noise Performance - Maxim

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