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About LDO compensation

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jonneylu

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ldo compensation

Hi friends,
How create a zero to compensate the pole from amplifier and power MOS,the zero from ESR of Cout always vary with ESR, so i want to use another fixed zero to compenste.
Thank you!
 

compensation rc for an ldo

Start by reading this paper. **broken link removed**
Essentially, a cap in series with the feedback resistor of the amplifier will give you the zero at the frequency: fz=1/(2*Π*RC)
The cap will affect the position of the pole, but only slightly.
 

A cap in series resistor can get a zole and the resistor can be generated by a MOS output resistor.
 

Read the paper for analysis of LDO compensation for either external comp. or internal comp. :

Study and Design of Low Drop-Out (LDO) Regulators
by Gabriel Alfonso Rincon-Mora & Phillip Allen

You can get the paper at:

**broken link removed**
 

This thesis has more in-depth LDO explanation:

A Capacitor-less Low Drop-Out Voltage Regulator

Author: Rorber Jon Milliken
Publication: T. A&M Thesis
Volume: 106 pages

**broken link removed**
 

two parallel paths with atleast one freequency dependent path creates zero
 

res in series with cap will produce zero
 

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