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GIGABYTE Z390 Designare (Intel Z390) Motherboard Preview (Page 3)

By Steven Bassiri from Jan 10, 2019 @ 10:00 CST
TweakTown Rating: 92%Manufacturer: GIGABYTE

Circuit Analysis




The Z390 Designare shows us the goods with the heat sinks removed!




The VRM is a large 12+1 phase VRM consisting of 50A Vishay SiC634 DrMOS for the CPU phases and a single SiC620 60A DrMOS for the iGPU. It is controlled by an Intersil ISL69138 digital PWM controller in 6+1 phase mode, and six ISL6617 doublers are used to balance phase currents between each set of doubled phases.



The doublers are in synchronous mode, so a PWM readout would look like a large 6-phase VRM instead of a 12-phase one, so the doublers are used exclusively to balance the current between pairs of phases. The design compromise was made on these boards to improve transient response. On GIGABYTE's IR-based Z390 VRMs, the PWM readout would look like a 12-phase VRM because of IR's transient algorithms, so asynchronous mode is engaged on this board. Either way, the VRMs are very nice.




The VCCSA and VCCIO are controlled by Richtek RT8120 single phase PWMs with integrated drivers, and they control some miniature On Semiconductor PowerPAKs labeled "4C06". The memory VRM uses the same Richtek PWMs, but with larger On Semiconductor "4C06N" N-channel PowerPAKs in a two low single high configuration.

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