I don't think this is important enough that Hans should move away from his current firmware efforts.
But I would like to see the switchers improved on future boards.
That should be possible with cheap SMPS IC's that have second sources.
?
There are multiple reports of D109 blowing when the power connector is jiggled.
One of which reported it was when using up to date firmware.
Not a lot of such reports and Hans has not reproduced this?with the updated firmware,
but a very brief interruption in +12v where the caps keep the Vdd rail up
for the STM32F would bring about this failure.?
Many users will be unduly cautious about touching the QMX with power on if this is left as is.
?
Would also be nice to have a definitive solution for users with current rev boards.
I think the SCR clamp would be a nice easy addition for those that are concerned.
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Jerry, KE7ER
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On Mon, Oct 21, 2024 at 10:33 PM, Stan Dye wrote:
Why should the design ever have to expect a sudden large step on Vin after the PWM 3.3V is stabilized (~1/4 second or so after power-on)?
