78xx pin compatible OpAmp-based MOSFET series regulator - diyAudio
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Old 24th December 2009, 12:51 PM   #1
ahiukka is offline ahiukka  Finland
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Default 78xx pin compatible OpAmp-based MOSFET series regulator

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
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File Type: gif reg.layout-schematic.gif (17.0 KB, 263 views)
File Type: gif reg.PCB-top.mirror.gif (5.4 KB, 238 views)
File Type: gif reg.PCB-bot.mirror.gif (3.9 KB, 225 views)
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Old 24th December 2009, 02:36 PM   #2
luka is offline luka  Slovenia
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nice, have you made any yet?
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Old 24th December 2009, 02:50 PM   #3
ahiukka is offline ahiukka  Finland
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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
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Old 24th December 2009, 03:34 PM   #4
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Remindes me on this
Ultra-Low-Noise LDO Achieves 6nV/√Hz Noise Performance - Maxim
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