🚀 go-pugleaf

Adam Duff (duff@cs.wisc.edu) wrote:
: Does anyone have any pointers toward good example circuits for
: linear regulation?
: 
: I require a circuit with very low output impedance (say, a couple of
: microOhms) from DC to at least 100kHz.  Actual voltage stability is
: secondary.  Typical output voltages will be from 50 to 100 VDC.
: Currents from 2 to 6 Amps.

I can not give you an application-note but any rule of tumps to realize
a regulator with very low output-resistance:

	1. DC
	-----
	The most important thing is remote-sensing from +DC and GND from
	powered device back to the regulator. The openloopgain of regula-
	tor-amplifier must be very high. This is by using of modern opams 
	no problem.

	2. AC (Low-Frequency)
	---------------------
	For high speed regulation it's important to use an opamp with
	a high gbw  and also a high slewrate to result of a low output-
	impedance.

	2. AC (High-Frequency)
	----------------------
	For a low impedance with highfrequency you must close a capacitor
	very near parallel to the powered device. The capacitor must have
	a very very low inductance. 
	

I know that's easy said. To build this circuit is not easy. I constructed
much power-supply-devices, but no one with such less impedance. I wish you
good luck and let e-mail me if you have a solution. I am interested.

Greeting from Thomas