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Than the zener is supposed to do all the work and can go short…. If the chip or any of these four transistors short, it can load the feedback winding voltage such that it never goes above 9 volts. AsynchroSerial’ window Step 7 – Generation of driver code. But digging further it looks alright. Originally Posted by Behemot: That is under normal operation though, if the DM draws more than 3 mA than it should, there can be higher drop on it than on the resistor.
However, what usually goes bad because of excessive overheating due to using that GP diode and no cooling, and because of poor quality, is the cap.
DM311 Datasheet PDF – Fairchild Semiconductor
To turn on and stay on, the feedback voltage must increase to a minimum of 9 volts. I have not seen a PSU of this type where they were not fatasheet replacing them is a must.
Anyway, thanks for your valuable input, I see these PSUs quite a lot, but never had time to dive so much much into these tanks of shit In the end, I took the basic 5vsb design using the DM from the Fortron GLN series, put the parts on a small piece of datsheet, and installed it on the Bestec. Seems they have been using several different ICs but with practically the same circuitry. It is possible I get some of those FSPs too and that would be helpful in troubleshooting them.
Now I don’t fix two transistor 5vsb circuits on Bestecs. Vfb The feedback voltage pin is the inverting input to the PWM comparator with nominal input.
Originally Posted by everell: Sim ple Attenuationrequirements of the application and can be calculated. But I don’t understand the purpose of the resistor, why have it there at all if the DM can handle up to v on Vstr?
Take it as a simple static linear power supply – it is designed for some exact current; as other linear PSUs, it basicaly burns most of the power we do not want, here on the 1M resistor.
Please keep us posted. So I think huge resistor is there to ensure slow enough charging of the Vcc cap otherwise there would be huge spike through the IC, auxiliary transformer windig and to the cap.
It used to be problem though you CAN squeeze at least 16V D10 caps in there and one or two on other rails with some effort. Check the voltage on pin 2. And than often the secondary CrapXons D8 which I have suitable replacements for, finally. Do I still have to use primary ground for this?
Try Findchips PRO for dm 8 pin ic.
It is the same board under the Sparkle brand. Ddm311 had multiple problems. Also if something is bad on the 5vsb line, it can load the transformer such that the feedback winding voltage never goes above 9 volts. But how come I end up with the really bad ones??? There is chance the PWM is bad as well. Measure it and let us know what you get. Statistics are great for politicians. Also, if the Vcc goes above 20 volts it turns off. Hopefully this information helps. Step 7 – Generation of driver code.
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The voltage on pin 2 of the DM must be above 9 volts, typically 12 volts. It is notinductance. Step 8 – Verification of the files. A minimum throughput rate of KHz Is achieved while only dissipating 1. CT as well as 24.
The DM datasheet specifies 20 V at 3 mA max.