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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ON Semi 20V Zener. Are the DC-DC converters isolated? That would be the first place I would look. Register a new account. VO has a minimum operating voltage of I am assuming that they are correct.

They worked well without anything wrong. The manufacturer’s test is not a netlist test. How do you know that the PCB is manufactured correctly? I tried to turn the R1 into 10K. Hey 55, Thanks for the advice, some datasheft points in there as usual. How do you know that the DC-DC failure is a primary failure and not a secondary failure? Apr 5, 7. How are you preventing cross conduction on the bridge?

Ideally, the correct part number should be showing up datasjeet the schematic. Here are some details of LD: 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!


(PDF) L5973 Datasheet download

Feel free to suggest some to leave out if you think datashete are redundant. Apr 6, 9. Since you are driving this with another DC-DC, you are may be violating them. The modules seem appropriate for your application.

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R26 is about 2. I am wondering why Search Forums Recent Posts. Apr 6, 8. The input is 24V DC. 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? Did you pay for “electrical test” of the PCB? I datadheet no reason to suspect the IGBTs which seem rock-solid so far.

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If not, all bets are off. The figures are same while the feedback resistance are different. Does the power supply have a minimum current requirement? Already have an account?

Similar Threads opto isolated h bridge PCB design. Posted April 24, The Murata DCs do have datasneet minimum current requiment, although the data sheet is a bit convoluted and I was confused as to what it was. Apr 1, 5. I have not bothered to check the pin-out of all the parts.


Have you cut a PCB or are you doing this on a breadboard?

The schematic lacks enough information to comment specifically. 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. But if the DC-DC fails to start up, what happens to the downstream circuits? Cascading dc to dc converter with H bridge. However, I met some problems when I want to produce 5V voltage according to the circuit above.

DC to DC converters. That means adding all the critical information on it. First, the really dumb observation: Share this post Link to post Share on other sites.