[SOLVED] type 1 compensation in voltage regulators

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tenso

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So I was reading an app note from Microsemi and came across a schematic for type 1 compensation using an opamp RC integrator.



So I wanted to know if this arrangement is right. Wouldn't you need a DC feedback resistor between the output and input to provide a DC path and regulate the DC voltage at the output? Or is it ok to not have a feedback resistor if the integrator itself is a part of the feedback loop?
 

Correct. The compensator is a part of the total system that includes DC feedback.
 
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    tenso

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The capacitor in feedback path offers infinite impedance at DC. That means you have Infinite Gain (Gain = - Zfb/Zin) at DC. In order to limit this DC gain you need a parallel resistor with capacitor.
Otherwise The DC gain will be limited only by the leakage impedance of the circuit.
 
Thanks for the help guys. question is answered, thread can be put as solved.
 

Hi,

thread can be put as solved.
Click to expand...
Then do so....just by pressing the "Mark as solved" button below.

Klaus
 

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