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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I have no reason to suspect the IGBTs which seem rock-solid so far. All the parts start with MPD and start with 5W. The figures are same while the feedback resistance are different. 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 Does the power supply have a minimum current requirement? How do you know that the DC-DC failure is a primary failure and not a secondary failure? I have not bothered to check the pin-out of all the parts.

DC to DC converters.

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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. With all these extraneous diodes, you may have a really poor layout which datasheft causing a lot of stray inductance in the high current traces, inducing all sorts of problems. Testing out of circuit against a reference device shows they truly are dead. Did you pay for “electrical test” of the PCB? VO has a minimum operating voltage of There are precautions about input voltage rise time at the bottom of Selection Guide on first page.


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


I’ve had the PCB made, so I’m pretty confident it’s exactly as you see there. How do you know that the circuit is exactly what you have drawn here?

You need to be a member in order to leave a comment. Looking through the schematic, here are the observations: The 12V line is fairly stable, based on a L which is only loaded with around mA a fraction of what it can handle. ON Semi 20V Zener. Similar Threads opto isolated h bridge PCB design. Register a new account. Ask a Question Want to reply to this thread or ask your own question?

Up To 2.5A Step Down Switching Regulator

The 12V input actually 12V? Hey 55, Thanks for the advice, some great points in there as usual. Search Forums Recent Posts.

Apr 1, 3. Sign In Sign Up. Discussion in ‘General Electronics Discussion’ started by stube40, Apr 1, In the same circuit, the voltage is 3.


Feel free to suggest some to leave out if you think they are redundant. I suspect you have either mistyped the part number or put down a distributor’s part number. That means adding all the critical information on it.

Ideally, the correct datasheeg number should be showing up on the schematic. Here are some details of LD: Already have an account? I have attached a pictures that shows the general idea of the schematic, as well as a detailed schematic with every component. What is the point of D7, D8, D9, D10?