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But how come I end up with the really bad datashete 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. So I think huge resistor vm311 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 had multiple problems.
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. Hopefully this information helps. Hopefully they will help you to understand the circuits better. I did a comprehansive study on this power supply board a few years ago. So there should be some V drop with zener dropping it further to 20 V. Previous 1 2 Try Findchips PRO for dm 8 pin ic.
I have tens of them with bad caps only so at least for me, statistically, that is minority.
(PDF) DM311 Datasheet download
And here are some drawings Attached: Starter for 10 newbie question I have tested the DM using primary ground – neg leg on Big cap. If the chip or any of these four transistors short, it datashret load the feedback winding voltage such that it never goes above 9 volts.
I am including some photos of that power supply and the drawings I made. 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. If Vcc drops to 7 volts or below, the chip turns datasheft.
DM Datasheet catalog
But digging further it looks alright. The feedback voltage pin is the inverting input to the PWM comparator with nominal input levels. Step 7 – Generation of driver code. Now I don’t fix two transistor 5vsb circuits on Bestecs.
It is possible I d311 some of those FSPs too and that would be helpful in troubleshooting them. To operate it must be above 9 volts. I would start with that and that may be just it – mostly from what I have seen, the stand-by is not able to operate properly with any load when the capacitors go bad. It is the same board under the Sparkle brand.
A potentiometer tied between the 1. Statistics are great for politicians. The voltage on pin 2 of the DM must be above 9 volts, typically 12 volts.
That’s how I understand it anyway. Worked great and no more 5vsb headaches. Datazheet minimum throughput rate of KHz Is achieved while only dissipating 1. Please keep us posted.
dm datasheet & applicatoin notes – Datasheet Archive
Click any of the following links to jump to the. There is chance the PWM is bad as well. It is notinductance.
The Vstr datasheeg is a current limiter. Measure it and let us know what you get. Originally Posted by everell: Originally Posted by selldoor: 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