Author Topic: Trade-off between LDO max Iout AND PSRR  (Read 503 times)

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Offline promachTopic starter

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Trade-off between LDO max Iout AND PSRR
« on: May 16, 2020, 05:48:29 am »
PSRR is inversely proportional to output impedance of LDO.

But Iout_max of LDO is proportional to width of output mosfet (M20) , Rds of M20 is inversely proportional to width of M20.

Given that output impedance is a parallel impedance configuration between Rds of M20 and (R1+R2), so Iout_max is proportional to output impedance of LDO.

If I need Iout_max = 3A, then my PSRR result looks very very bad.









« Last Edit: May 17, 2020, 09:26:53 am by promach »
 


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