#32 Linear voltage regulators architectures

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This video discusses various LDO classifications. LDOs can be classified based on type of power device, location of dominant pole, fully on chip or not and open or closed loop type. Video also discusses some use cases in the end.

Пікірлер: 17

@jagdishpanpalia7482 2 жыл бұрын

Excited for the upcoming detailed videos on each architecture. Eagerly waiting 😃

@abhiruplahiri1 2 жыл бұрын

Good stuff as always!

@sudhanshusingh1234 2 жыл бұрын

Good to understand

@RohitSingh-qe6fp Жыл бұрын

Good explanation

@IcRDlayout 6 ай бұрын

I am new😊 LDO voltage😊

@98505177229850590818 2 жыл бұрын

How did u get VIN MIN IS vout plus 1 for nmos regulator ? Also can u tell whether pmos or nmos works in linear or saturation mode during regulating ?

@analogsnippets Жыл бұрын

NMOS regulator needs gate voltage higher than output voltage. Since threshold voltage of nmos is ~0.7V, I have assumed we would need 1V above vout.

@analogsnippets Жыл бұрын

For most part nmos and pmos work in saturation. For higher load current pmos may enter linear but a good design would try to limit it to corner cases. For nmos if amplifier is supplied by vin then nmos will always be in saturation region.

@yunusdification 2 жыл бұрын

You would only need Vth in the source follower case.

@yunusdification 2 жыл бұрын

Infact there can be benefits in PSRR if you use the source follower LDO

@vladimirvolokitin8367 2 жыл бұрын

@@yunusdification only if you have very good PSRR for your Amplifier. On other hand for PMOS LDO amplifier PSRR should be ZERO

@yunusdification 2 жыл бұрын

@@vladimirvolokitin8367 yeah good point. the first pole of opamp becomes the dominant pole. So in fact to adjust that pole you add cap at output of opamp to compensate the loop. This cap should also help the PSRR.

@pikulsarkar7537 2 жыл бұрын

Can you add digital ldo to the list and discuss in details in one video?

@analogsnippets 2 жыл бұрын

What do you mean by digital ldo? The use case that I gave in video?

@pikulsarkar7537 2 жыл бұрын

@@analogsnippets No. Loop will be digitally controlled with power mos acting as switches.

@analogsnippets 2 жыл бұрын

I have only read about it, not actually designed it. So not an expert on this topic.

@abhiruplahiri1 2 жыл бұрын

Hi Pikul, here is a link to a simple work we did for dig ldo: A. Lahiri, S. Bansal, N. Bansal and M. S. Hashmi, "Digital LDO with analog-assisted dynamic reference correction for fast and accurate load regulation," 2017 IEEE 60th International Midwest Symposium on Circuits and Systems (MWSCAS), 2017, pp. 767-770, doi: 10.1109/MWSCAS.2017.8053036