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LTSpice model of LDO

Adithya_Pai

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I have set Rds on of LDO using model card

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I have obtained 178mOhm Now i have to use in LDO as pass transistor can i directly use this so that Ron will be the same for dropout test case? How should I move forward in developing LDO simple control loop (Pass element, EA , Feedback divider)?

Share some of the exercise if it helps for developing...
 

KlausST

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Hi,

There are many LDO example circuits in the internet. Some even with explanations and calculations. Choose one.
Do some tests.

If you encounter any problems:
* show us your circuit
* tell us what you expect
* tell us what you see instead

Klaus
 

Adithya_Pai

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https://datasheets.maximintegrated.com/en/ds/MAX1725-MAX1726.pdf

I am modeling LDO of MAX1762. eda_.png

Initially I set W, L, Kp value according to Ron required but I didnt obtain dropout voltage required. So I added 9.4 ohm series resistance. Then by trial and error method i set gain of Error amplifier.
Is this proper way of setting ron and Gain of Eroor amplifier. Initially I am expecting loop to work fine with dropout test case , regulated output according to resistor divider set(Steady state)?
Next I will be doing line, load transient which may require some modification...
 

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