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DESCRIPTION. The LD is a step down monolithic power switch- ing regulator with a minimum switch current limit of. A so it is able to deliver more than. L datasheet, L circuit, L data sheet: STMICROELECTRONICS – A SWITCH STEP DOWN SWITCHING REGULATOR,alldatasheet, datasheet, . L Datasheet, L PDF, L Data sheet, L manual, L pdf, L, datenblatt, Electronics L, alldatasheet, free, datasheet, Datasheets.

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Discussion in ‘General Electronics Discussion’ started by stube40, Apr 1, Search Forums Recent Posts. Apr 1, 1. Testing out of circuit against a reference device shows they truly are dead. I have attached a pictures that shows the general p5973 of the schematic, as well as a detailed schematic with every component. I suppose I must be damaging the Murata’s though inadequate protection, although so far I haven’t been able to catch any suspicious spikes on the oscilloscope.

My only other thought is that I’m over-loading the output of the Muratas which are only rated to 1W.

A2B34IAE РInteligentní aplikovaná elektronika РB171

I’m beginning to run out of ideas – can anyone suggest something to try? Apr 1, 2. I suspect you have either mistyped the part number or put down a distributor’s part number.

Ideally, the correct part number should be showing up on the schematic. The schematic lacks enough information to comment specifically. A few general comments: Does the power supply have a minimum current requirement? Do they require some external capacitance? The 12V input actually 12V? Are the DC-DC converters isolated? What is the input to output isolation?

Have you cut a PCB or are you doing this on a breadboard? How do you know that the circuit is exactly what you have drawn here? How are you preventing cross conduction on the bridge? Apr 1, 3. I’ve had the PCB made, so I’m pretty confident it’s exactly as you see there.

If it becomes critical, I’ll post the data sheets for the Zeners on Tuesday when i’m back at work.

The Murata DCs do have a minimum current requiment, although the data sheet is a bit convoluted and I was confused as to what it was. Apr 1, 4.

Still no luck on the DC-DC. All the parts start with MPD and start with 5W. Are you sure it is a MuRata and not a knockoff? Going on a slight tangent If you are hoping to send your schematics out to other to have them review it, you need to draw them properly. That means adding all the critical information on it. I would recommend you update the schematic to reflect the part numbers so someone looking at it can datazheet what is going on. For all I know the problem is that you are using a 5V zener, but I have no way of knowing because all I see is “zener” p.


Apr 1, 5. Apr 1, 6. Sure, I know the schematic is crap – I drew it in a hurry with really old and crappy design software. I’m in the 5l973 of migrating to Altium, but the project timescales didn’t fit in with darasheet associate learning the curve – will rectify all the problems for the datasheey project Apr 5, 7. ON Semi 20V Zener.

Apr 6, 8. I have gotten REALLY busy due to some issues coming up out of nowhere at work and have not had a chance to post here or eat or sleep or First, the really dumb observation: Have you considered the possibility that you were delivered wrong DC-DC converters and you are installing 5V input voltage devices into 12V? How good is your 12V? Could it be over-shooting beyond the DC-DC’s maximum voltage?

Have you stressed it and thoroughly tested it? Looking through the DC-DC datasheet, here are the observations: Hence I was unable to find the datasheet. The modules seem appropriate for your application. There are precautions about input voltage rise time at the bottom of Selection Guide on first page.

Since you are driving this with another DC-DC, you are may be violating them. But I can not imagine that violating them would cause the device to fail. But if the DC-DC fails to start up, what happens to the downstream circuits? Looking through the schematic, here are the observations: You have way too many unnecessary diodes in there. What is the point of D7, D8, D9, D10?

Same for diodes on the other 4 channels? VO has a minimum operating voltage of What happens when the output of your DC-DC sinks below I have not bothered to check the pin-out of all the parts.

I am assuming that they are correct. If not, all bets are off. How do you know that the DC-DC failure is a primary failure and not a secondary failure? That would be the first place I would look. How do you know that your layout is correct? How do you know that the PCB is manufactured correctly? Did you pay for “electrical test” of the PCB? Was it a “golden board” test or a real netlist based test?

Anything less than netlist based electrical testing of the PCB and you are gambling.

L STMicroelectronics|PMIC – Voltage Regulators – DCDC Switching Regulators | WIN SOURCE

How good is the layout? With all these extraneous diodes, you may have a really poor layout which is causing a lot of stray inductance in the high current traces, inducing all sorts of problems. Is R26 and its siblings placed next to the driver where it would reduce ringing or is it placed next to the IGBT where it would promote it?


While the schematic looks reasonable, your real problem may be in the layout. Unfortunately, that is beyond the scope of what I can help you over the internet. Apr 6, 9. Hey 55, Thanks for the advice, some great points in there as usual.

(PDF) L5973 Datasheet download

Here are my thoughts: They are definitely NMASC, but that wasn’t a dumb thing to say it wouldn’t be the first time I’d done something like that! The 12V line is fairly stable, based on a L which is only loaded with around mA a fraction of what it p5973 handle. My philosophy has always been to go overboard with the dataheet in the PCB design then decide later whether I want to populate those parts. Feel free to suggest some to leave out if you think they are redundant.

Good point about the I have no reason to suspect the IGBTs which seem rock-solid so far. The manufacturer’s test is not a netlist test. Saying all that, it is a fairly simple design and so far my manual inspection has found no reasons to be concerned. The quality of the layout is a different matter, hence the stray inductance may be an issue – not sure what to suggest other than to remove some of the protection diodes. R26 is about 2. I think early experiments have shown that there is ringing and it may well be causing problems.

I can change the distances hence, this ringing would have to be fixed by adding other components. If you have any tips then let me know. Thanks again for your invaluable comments. You must log in or sign up to reply here.

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Cascading dc to dc converter with H bridge. DC to DC converters.