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Also, if the Vcc goes above 20 volts it turns off. It istransformer will decrease leakage inductance. 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.
But how come I end up with the really bad ones??? Hopefully they will help you to understand the circuits better.
A minimum throughput rate of KHz Is achieved while only dissipating 1. So you need to replace them datawheet, every time. Originally Posted by selldoor: Everells idea of replacing 1N with some fast diode together with quality caps should keep them alive for much longer. Step 7 – Generation of driver code. It datasneet notinductance.
Please keep us posted. I will start with replacing the secondary diode, the zener and the R44 resistor and see. Typical operation on this power supply, it should reach and maintain 12 volts.
To turn on and stay on, the feedback voltage must increase to a minimum of 9 volts. Step 8 – Verification of the files. Catasheet here are some drawings Attached: The feedback voltage pin is the inverting input to the PWM comparator with nominal input levels. It is possible I get some of those FSPs too and that would be helpful in troubleshooting them.
But digging further it looks alright. It may start with no load making an impression it is actually OK.
DM311 View Datasheet(PDF) – Fairchild Semiconductor
Vfb The feedback voltage pin is the inverting input to the PWM comparator with nominal input. Check the voltage on pin 2.
Click any of the following links to jump to the. Oh my bad, I’ve been talking about Vcc…the Vstr should consume uA. 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.
I have tens of them with bad caps only so at least for me, statistically, that is minority. 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.
I am including some photos of that power supply and the dayasheet I made. Previous 1 2 That’s how I understand it anyway. And shorted shottky diode on secondary side, I wonder if that was what killed the primary, or the other way around? To sustain operation, it depends on the feedback voltage from transformer T2 thru diode D41 to provide Vcc voltage on pin 2 of the DM chip.
The voltage on datashete 2 of the DM must be above 9 volts, typically 12 volts. The DM datasheet specifies 20 V at 3 mA max. The Vstr resistor is a current limiter. But I don’t understand the purpose of the resistor, datasheeet have it there at all if the DM can handle up to v on Vstr?
If Vcc drops to 7 volts or below, the chip turns off. It had multiple problems. Hopefully this information helps. To operate it must be above 9 volts. 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.
I did a comprehansive study on this power supply board a few years ago. Now I don’t fix two transistor 5vsb circuits on Bestecs.
DM Datasheet PDF – Fairchild Semiconductor DATASHEETBANK
There is chance the PWM is bad as well. These services include sameday shipping on orders received prior to 8 p. 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. So there should be some V drop with zener dropping it further to 20 V.
It is the same board under the Sparkle brand. I don’t know how much the zener can handle but I won’t expect much more than 50 V, than the current through it would be too high. Than the zener is supposed to do all the work and can go short…. A potentiometer tied between the 1. No abstract text available Text: Perhaps the large capxon cap started to go bad, and the PFC circuit worked harder to maintain the voltage, overheating the PFC coil and shorting out the DM from high voltage spikes?
And than often the secondary CrapXons D8 which I have suitable replacements for, finally.