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Robert_PIN_ASAP's avatar
Robert_PIN_ASAP
Icon for Occasional Contributor rankOccasional Contributor
2 months ago

Agilex 3 VCCLSENSE and GNDSENSE

Hello, For Agilex 3, what is the recommendation for VCCLSENSE and GNDSENSE  if our regulator for VCC does not provide remote sense inputs?    Can we just leave these two device outputs as no connect...
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FvM's avatar
FvM
Icon for Super Contributor rankSuper Contributor
2 months ago

Hello,

obviously the regulator portfolio suggested in Agilex 3 PCB Design Guidelines doesn't cover the full range of possible Agilex 3 designs. Using a multiphase VRM driver with 120 A capability for VCC is far off many smaller Agilex 3 applications. I would rather think about 5 - 20 A regulators with integrated output stage as used in many Agilex 3 development kits, including Altera originated designs. Using only one of suggested regulators is completely contradicting Agilex 3 market position as "Power and Cost-Optimized" device.

VCC precision is a different point. It can be noticed that even not all suggested regulators achieve specified 0.5 % accuracy at 0.78V, but I would basically try to follow the suggestion. If sense lines are actually required depends on expected maximal VCC load current. It should be however possible to connect at least VCCL_SENSE to regulator feedback.

Regards
Frank