LM723 circuit schematic problem

Thread Starter

Nguyễn Duy Mạnh

Joined Apr 25, 2018
26
View attachment 165861NI input

Boy I am having a problem seeing this. The NI input is connected to Vref thru R3, for bias
offset ? Or to decouple the NI input from Vref ? So R1 and R2 form a divider feeding back a
fractional part of Vout to inverting input, thereby effecting the control loop. If Vout rises, the
R1/R2 junction rise, the Amp gains that up in a negative direction, dropping
base drive for output transistor, and lowering the V. Am I losing my marbles ?

As you say the loop keeps servoing the junction of R1/R2 to equal Vref, but the
correction loop is the divide change in Vout reflected back to the base drive,
after being gained up and inverted, by the amp.

Regards, Dana.
this a loop certainly, the feedback resistor go in+ or in- and vref go the other, it makes a comparator, create the pulse to open/close the interior transistor. like a buck boost converter.
 
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