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Yeah that was mybad, I was thinking he replaced the 0.1uF bypass capacitor on the Gate driver's pin 9, looking back at the schematic I see you mean the PWM pin 9 compensation.
In that case an RC network will probably suffice, something along the lines of 10K, 100nF.
I guess the Datasheet for the Gate driver was underestimating the need for a higher compensation capacitor, or the gate driver was expecting it's own bypass and compensation capacitor instead of sharing one with the PWM?
Correct, two 10K resistors makes 5V - 2.5*(1+(10000/10000))=5V
As for maximum safe voltage I am not sure but the ATX V2.2 standard specifies the following tolerances for it's various power rails:
+3.3VDC ± 5% +3.135 VDC +3.465 VDC
--> +5VDC ± 5% +4.750 VDC +5.250 VDC <--
+5VSB ± 5%...
Use a TL431 or Zener to activate an SCR connected across power rail and ground. A.k.a. crowbar circuit :)
Adjust R3 and R4 to set the trigger voltage, formula for calculating TL431 voltage is: 2.5*(1+ (R3/R4))
It's easy to implement because the circuit lives on the secondary side and runs...
Since it's working below and above that particular voltage range, I am left wondering if it has to do with some odd harmonic or resonance encountered only at that voltage range. If that is the case, there must be some sort of noise that is interfering with the PWM or Feedback loop?
If the feedback loop is TL431 based (TL431 is a 3-pin shunt regulator, aka Variable zener) you can change the resistor values to get 30V on the 12V rail. Formula for TL431 voltage is 2.5*(1+ (HIGH_SIDE_RESISTOR/LOW_SIDE_RESISTOR)) values are in Ohms and 2.5 is the TL431 internal reference...
I have seen this so many times, the fan spins for a short period of time because the supply is starting up (for a short period of time) and over current detection is kicking in and shutting the power supply down. This means one of your output rectifiers is dead, or half of a common cathode...
Here is an analogy on why Perpetual Motion doesn't work and why it's not a source of "free energy"... Imagine a pump and some rubber tubes, the pump is pumping water from a reservoir (container of some sorts) through the tubes and into a device whereby the water turns a wheel, which turns a...
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