EEVblog 1769 – Who Needs Three Phases? REPAIR

Can you repair a PSU by REMOVING a component? Well, in this case, yeah, kinda.

Not recommended for new designs, but it works (for now) because the design margins allowed it.

00:00 – My NerdQaxe++ Bitcoin miner has failed. Guru Meditation!

02:13 – Bitmain 1370 chipset thermal paste

03:54 – The flipchip die under the microscope

04:48 – Thermal paste application triggering

06:55 – Time for a new strategy R2. The Vreg temp sensor is now the suspect

07:53 – A look at the open source hardware schematic in KiCAD

https://github.com/shufps/qaxe

09:42 – The TPS53647 4 Phase ASIC Buck PSU controller

https://www.ti.com/lit/ds/symlink/tps53647.pdf

10:23 – The CSD95472Q5MC Synchronous Buck NexFET Smart Power Stage