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IR3M02 from Sharp Corporation. Find the PDF Datasheet, Specifications and Distributor Information. IR3M02 Pulse Width Modulation Type Switching Regulator Contrl ic. Details, datasheet, quote on part number: IR3M Electronic component datasheet for IR3M02 manufacturer SHARP. Free doqnload!.

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Thanks Chuck Gnow for a question you may have guessed coming: The secondary from T4 goes back into the control circuitry, as adtasheet the secondary from T1. I will try to do a circuit diagram tomorrow of this part of the circuitand point them out.

Its the original Full AT style like in the An open or weak main cap will read large AC content.

Datasbeet would think in an overcurrent condition you would be able to hear a ticking sound. Usually, one output is selected as the reference value for oscillator control.

Connect DC supply via a current limiting resistor eg ohms to SMPS IC – check voltage on each IC to determine that supply is within range, increase DC voltage until all ICs are powered up, check voltage drop across current limiting resistor for current drain.

The power supply will not try to start again until the main caps have discharged so needs to be off then caps discharge to reset. Set up as per Sencore guide would be as follows: Then check the comparator ICs, each probably contains two or more comparators, each has two inputs and one output.

Here are his 1. The voltage selector switch actually reads ohms when in V, not sure if that’s by design or 20 years or corrosion. I have not checked the values of all the resistors, except in immediate areas to where i have been checking.

SHARP (SHARP ELECTRIONIC COMPONENTS) Electronic Components Datasheet –

That kick is just from the start up circuit. A simple ohmmeter test between the common rail and each output should determine if there are any shorted filter caps. A schematic and a scope would be needed to narrow it down further. If so, then you have a short on the secondary circuit. Just a thought have you checked the bleeder resistors, They can go open, Not only can they serve as a safety device they can also establish a predetermined level, VDC is definitely not right, Around VDC or VDC per Cap as Chuck and Retrogear have said is about right, Might vary a bit as it depends on what you got coming out of your wall socket.

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You might need to desolder the D1 bridge to measure with a diode check because of the capacitors and T1. I have ordered a 2. However when I first connect the probes it did jump to about 30V then went to 0V.

Is that across the AC mains?

So if that’s the case getting 7V at either VCC is wrong. I removed J1 that links T1 to the datashheet point of the two main filter caps. Any help appreciated Oh and BTW, yes, i know how to discharge caps: The capacitor is labeled: The datasheet i found for it is dreadful quality. In my previous post I was trying to explain an unbalanced doubler. The ohms was with the switch removed, that is, measuring the switch itsself.

(PDF) IR3M02 Datasheet download

You’ve got a 2. I could not get an AC reading across either cap. At present my only idea is to disable the auto-shutdown feature of the IR3MO2 and see what happens. If not, check whatever the device is highlighted in blue.

(Datasheet) IR3M02 pdf – Pulse Width Modulation Type Switching Regulator Contrl IC (1-page)

If you’ve got a DMM with a capacitance scale, lift one of the legs from the board and verify the value. It’ll be interesting to see if the PSU works on V as Chuck suggested, I have read of this problem before where PSU’s have spent most of datwsheet life running on V and when switched over to V they don’t work but when put back on V they work fine.


In fact I think this is the problem. What’s the history of this PSU, Has it worked since you’ve had it or did you get it non working, Bleeder resisters are in parallel with the cap, If fitted that is. Today I have de-soldered the bridge and replaced it with another, still same deal.

Be sure and measure the AC across C1 and C2 which darasheet be the same. I replaced some caps around there too. If one of those fails, it’s usually as ur3m02 short. I vote for those, too. It got me back out of bed.

I cant think the LM is too fussy about 18V exactly, because if it did this power supply design as far as i can tell would require a VAC source in V mode. I haven’t been exhaustive, partly because its a datzsheet beyond me and partly because it is only an AT PSU. Good Idea I am going to id3m02 to get an early nights sleep to night. This leads me to believe that, there is something wrong in the output section.

Hi, well i replaced the non-polar cap with a new one, and replaced the 5 electrolytic caps on the output side, but its still datashset working. I’m guessing the Vcc on pin 12 provides a 5V reference on 14 which is compared to the sample.

I now get a much bigger kick of the fan, but the 3. What are you using for a load? Here’s a typical example http: The voltage selector datxsheet is set as open.