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.
|Published (Last):||21 December 2013|
|PDF File Size:||18.3 Mb|
|ePub File Size:||3.4 Mb|
|Price:||Free* [*Free Regsitration Required]|
First, the really dumb observation: But if the DC-DC fails to start up, what happens to the downstream circuits? The figures are same while the feedback resistance are different.
Hi, I want to ask for your help on my LD. I have no reason to suspect the IGBTs which seem rock-solid so far.
e-l, buy e-l, specification & datasheets
H bridge loading problems. By JessicaleApril 24, in Power Electronics. Feel free to suggest some to leave out if you think they are redundant. Are you sure it is a MuRata and not a knockoff?
Apr 1, 2. Unfortunately, that is beyond the scope of what I can help you over the internet. If it becomes critical, I’ll post the data sheets for the Zeners on Tuesday when i’m back at work.
The schematic lacks enough information to comment specifically. VO has a minimum operating voltage of Did you pay for “electrical test” of the PCB? You must log in or sign up to reply here. Does the power supply have a minimum current requirement? Apr 1, 4. Apr 1, 6.
R26 is about 2. 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 can handle. The 12V input actually 12V? Looking through the schematic, here are the l59773 Still no luck on the DC-DC. Hence I was unable to find the datasheet. Power Electronics Search In. But I can not imagine that violating them would cause the device to fail.
Apr 1, 3. 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. The manufacturer’s test is not a netlist test. What is the point of D7, D8, D9, D10?
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?
Saying all that, it is a datasbeet simple design and so far my manual inspection has found no reasons to be concerned. Search Forums Recent Posts. That would be the first place I would look.
I am wondering why If you have any tips then let me know. If not, all bets are off. I’m in the process of migrating to Altium, but the project timescales didn’t fit in with the associate learning the curve – will rectify all the problems for the next project I have attached a pictures that shows the general idea of the schematic, as well as a detailed schematic with every component. Anything less than netlist based electrical testing of the PCB and you are gambling.
Same for diodes on the other 4 channels? My philosophy has always been to go overboard with the protection in the PCB design then decide later whether I want to populate those parts. Here are some details of LD: Sign in Already have an account?
I think early experiments have shown that there is ringing and it may well be causing problems. Are the DC-DC converters isolated? How good is your 12V? You need to be a member in order to leave a comment.