I've done some analysis of the Mathesar designed SMPSU modules that have been flying around after watching one catch fire on me during the Amiga Ireland event and another one caught fire on @chucky live last weekend.
Here is the circuit
and here is the reference design for this part.
What we observed was that if the output was shorted to ground the diodes exceeded 150 degrees. In my case started to catch fire. I was uncomfortable with this because linear regulators have thermal shutdowns to prevent fires. Closer reading
Basically these diodes added by Mathesar are screwing up the devices ability to shut down and have bypassed all safety. They are really really dangerous. Do not leave machines with these devices in on unattended. They could cause a fire. Just dont do this.
7.3.3 Soft Startup
After enabling the device, internal soft startup circuitry ramps up the output voltage which reaches nominal output
voltage during a startup time. This avoids excessive inrush current and creates a smooth output voltage rise
slope. It also prevents excessive voltage drops of primary cells and rechargeable batteries with high internal
The TLV62569 is able to start into a pre-biased output capacitor. The converter starts with the applied bias
voltage and ramps the output voltage to its nominal value.
I believe they are there to prevent 060s from getting 5v on input pins before 3.3v is up. This is the wrong way to do power sequencing. Use an SMC or put buffers between all your pins and the 5v inputs. At the very least put a resistor in to limit the current through those diodes. Jeez.
The TF1260 does not need a this as no 5v rails go direct to the CPU. Every pin is buffered through a Bus Switch or the Xilinx CPLD. Only those devices ever see 5V. For the XIlinx " External I/O voltage may not exceed VCCINT by 4.0V.". The soft startup on those PSUs is 800uS. Let's assume it's linear (it's totally but ignore that for now). That means it takes 242us to get to 1V. The A1200 has a 1000uF cap on the 5V input, from the schematic. For it to charge that cap too fast, it needs to get at least 4 amps into it, not counting whatever the rest of the board is doing. So there is absolutely no need for those diodes.
In anycase I'd rather replace a couple of CPLDs than someones house.. JUST NO! Dont do this!