Timeline for Is it 'ok' to use a switched power supply to power a processor core?
Current License: CC BY-SA 3.0
5 events
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| Feb 18, 2017 at 19:33 | comment | added | Marcus Müller | Because it's often much much easier to design a SMPS that is "close enough" for an LDO to be very efficient. In total, you lose little energy in the LDO and get excellent regulation with low cost, low complexity, low risk and little space usage. | |
| Feb 18, 2017 at 19:31 | comment | added | Jack Creasey | I wouldn't do it (pursue the hybrid) unless the ripple was pushing the operating voltage toward a limit. For example if I was leaving a sleep to active state the VDDInt might jump quite suddenly from just mA or so to close to 100 mA. With an SMPS there will be a dip (depending on switching frequency) ...I might also see a sudden rise as I leave active and go to sleep mode. With a hybrid approach I can buffer the SMPS with output capacitance and let the LDO remove the ripple reducing the work I need to do on the SMPS while remaining within my voltage limits. | |
| Feb 18, 2017 at 18:48 | comment | added | Izzo | That's an interesting idea.. But if a switchmode supply would work, why pursue the hybrid path? Just for assurance? | |
| Feb 18, 2017 at 18:39 | history | edited | Jack Creasey | CC BY-SA 3.0 |
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| Feb 18, 2017 at 18:33 | history | answered | Jack Creasey | CC BY-SA 3.0 |