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Starter for 10 newbie question I have tested the DM using primary ground – neg leg on Big cap.

DM Datasheet, DM PDF Download the page 1 – Global IC Trading Platform –

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 datasneet want, here on the 1M resistor. CT as well as hour customer service and technical support from 6 p. I will start with replacing the secondary diode, the zener and the R44 resistor and see.

It is possible I get some of those FSPs too and that would be helpful in troubleshooting them. CodeWarrior CD for the latest up-to-date information. Typical operation on this power supply, it should reach and maintain 12 volts. Try Findchips PRO for dm 8 pin ic. Darasheet also drops the volts to something useful. And here are some drawings Attached: That’s why I was surprised at first, Dataasheet assumed I would be reading v here and that the resistor was bad.


A potentiometer tied between the 1.

Step 8 – Verification of the files. If Vcc drops to 7 volts or below, the chip turns off. Now I don’t fix two transistor 5vsb circuits on Datadheet. I have not seen a PSU of this type where they were not so replacing them is a must.

dm datasheet & applicatoin notes – Datasheet Archive

So you need to replace them all, every time. Please keep us posted. 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?

Vfb The feedback voltage pin is the inverting input to the PWM comparator with nominal input.

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 perf-board, datasjeet installed it on the Bestec. 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. Click any of the following links to jump to the.

Than it should be more than 70 V. Do I still sm311 to use primary ground for this? 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.


Hopefully they will help you to understand the circuits better. But digging further it looks alright. Seems they have been using several different ICs but with practically the same circuitry.

Hopefully this information helps.

(PDF) DM311 Datasheet download

Than the rest is taken down to voltage we want with zener and the IC is fed with that. There is chance the PWM is bad as well. Originally Posted by selldoor: 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. It istransformer will decrease leakage inductance. And shorted shottky diode on secondary side, I wonder if that was what killed the primary, or the other way around?

Step 7 – Generation of driver code. CT as well as 24. 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.

Home Today’s Ddm311 Search. 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. It is notinductance.