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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I should really add a switch to set the ground point. I have not checked the values of all the resistors, except in immediate areas to where i have been checking.

What are you using for a load? Then check how the comparators are performing, to do this you ratasheet need a couple of DC power supplies. Just jumper it if needed. Thanks Chuck Gnow for a question you may have guessed coming: Then check the comparator ICs, each probably contains two or more comparators, each has two inputs and one output.

You might need to desolder the D1 bridge to measure with a diode check because of the capacitors and T1. I would think in an overcurrent condition you would be able to hear a ticking sound.

Sharp Electronics – IR3M02 PDF 数据手册 , IR3M02 数据表 – DataSheetBank

So if that’s the case getting 7V at either VCC is wrong. LM on their outputs. Is it my eyes or do those main caps look bulged? I have looked through a few different diagrams of PSU design and not seen anything like this.

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A project a long time ago. Its a familiar number to me to do with 3-phase, so I will have to look here a bit more closely, perhaps the rectifier is screwy.

The first involves changing the line AC to to DC, so there’s typically a bridge rectifier and a smoothing capacitor s. Here’s a typical example http: Yup some manufactures put the value on the cap as is, 2. I’m learning a lot though. Then check the AC across each of the main filters individually. However when I first connect the probes it did jump to about 30V then went to 0V.

Or possibly one of those step-down transformers used for portable power tools in the UK? After you try Chuck’s suggestion with a step down, if you’re still thinking bad T1 you could unsolder the primary and see if the voltage raises to VAC It should be a low ohm thermistor or something like that. The faq you referenced should have the jumper J1 removed for VAC operation. Ok well i have been looking around and around, tried many things as the source of the problem, and still i am no further.

Thanks all of you for your help so far.

The LM requires a power supply voltage of: It has to be your full line AC V. Its been a while since I read the values on a power resistor, is the placement of the ohm symbol supposed to indicate the multiplier?

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With AC i get maybe V. I replaced some caps around there too. Set up as per Sencore guide would be as follows: I will try to do a circuit diagram tomorrow of this part of the circuitand point them out. Sorry they are a bit grainy. That kick is just from the start up dataeheet. Thats a bit close to the 25V rating of C Most of the small caps i have replaced.

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Because the stuff coming off of the transformer is high-frequency, you don’t need nearly as large a smoothing capacitor than you would if you were dealing with line frequencies.

From the source above I have narrowed it down to the control section. I will have a look at it tomorrow. In my previous post I catasheet trying to explain an unbalanced doubler. If i switch on the Auxiliary Power supply feeding the 18V in I get the kick of the fan.

IR3M02 (SHARP) – Pulse Width Modulation Type Switching Regulator Contrl Ic, Switching Regulators

I’m wondering if the PSU behaves if you apply V to it However its actually fine there. I get about 7V on the 12V and 3V on the 5V for a second and then it dies.

An open or weak main cap will read large AC content.