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LM2596HVS

james mccown
Prodigy 50 points
Other Parts Discussed in Thread: LM2596, LM2592HV, LM5576, LM46002, TPS54361, LM2576

Anyone know where this device went?  I have some PCBs that use it and wanted to use it for a new design.  The logo on the existing chip is National Semiconductor.  Cannot find the LM2596 device in the high voltage input anywhere.  Odd that google searches return nothing at all.  

Did TI buy all the National stuff?  Did they kill this device?

  • 0
    TI__Guru**** 191445 points

    Moving to simple switcher forum...

  • 0 in reply to JohnTucker
    Prodigy 50 points

    OK, I see that you are a TI employee.  Sorry for posting in the wrong forum, but can you possibly find someone to answer my query?

  • 0 in reply to james mccown
    TI__Guru 71905 points

    At first glance it appears that TI does not support the LM2596HV any longer.  However, I will talk to the product engineer to determine the status more definitely.

    If you can use a 40V device, then the LM2596 will work.  If you need 60V and 2A then the LM2592HV is pin compatible with the LM2596.  The LM46002 is  60V and 2A;  the LM5576 is 75V and 3A;  the TPS54361 is 60V and 3.5A.  None of these last are pin compatible.

  • 0 in reply to Frank De Stasi
    Prodigy 50 points

    Thanks, that is very helpful.

    I am interested to see how one can obtain the LM2596HV for any source.  

  • 0 in reply to james mccown
    Prodigy 180 points
    Wow, it's SO difficult to get on the TI forum just to answer a question. . .

    James, if you're willing to look at "any source" for LM2596HV units, you can procure ready-made LM2596HV modules from China via eBay, and they're currently running about $1.84 apiece, free (and slow) shipping. www.ebay.com/.../231764369726

    You have to be careful, though, as there are a lot of fakes and scams out in this case.
    Case in point: I searched eBay for "LM2596HV", and got a number of results with regular LM2596S units, and the 35v input capacitor to go with it! But I thought I had found a good LM2596HV board for $1.55...only to find this YouTube video: www.youtube.com/watch
    Whoa! The $1.55 (blue) boards are rebranded (restamped) LM2596 chips. (Restamped chips seem to have really tight part numbers, and they usually aren't centered on the chip.) The link above is for the red board, with the two diodes and the clearly marked LM2596HVS unit.

    Your mileage may vary, and I will be quick to tell you that eBay absolutely is NOT a substitute for genuine parts. Use parts purchased on eBay at your own risk!
  • 0 in reply to Sid Lori
    Prodigy 50 points

    I have some of the chinese modules and they seem to be OK.  But they will not answer the most basic questions.

    Where are they getting the regulator, is it obsolete EOL stock?  Can they get more?

    I don't   want to design something around their module only to find that they are selling me surplus.  

    I would like to find out where they are getting the chips.  If there is new stock available to them then I would use their part because I cannot even purchase the piece parts for less than they are shipping a whole module.

  • 0 in reply to james mccown
    Prodigy 180 points
    Wait a minute...I just checked Mouser's website. Search for the LM2576HVT family. At a glance, the circuit appears to be the same as the 2596. (I'm not sure what makes them different from the 2596.) They're pin-compatible, absolute maximum of 63v, 3A output current...and cost about $5.48 apiece. These are guaranteed genuine parts, though.
  • 0 in reply to Sid Lori
    TI__Guru 71905 points

    The LM2576 is similar to the LM2596.  However, the switching frequency is 52kHz.  So, the inductor and caps will be sized differently than the LM2596. 

    The LM2576 is actually and older device than the LM2596; so the only way to design with it is to use the data sheet recommendations.

  • 0 in reply to Frank De Stasi
    Prodigy 50 points

    Not worried about designing with the 2596, just trying to find a source for the HV version.  

    I really need 60 volts input and 2.5 amps.  Looking for the lowest cost solution. 

  • 0 in reply to james mccown
    Prodigy 180 points

    James, is there anything wrong with the LM2576HV ?  While it's a bit pricey from Mouser, it does handle the 3A output current and the 60v input.  As Frank pointed out, the switching frequency is lower than the 2596.  (EDIT: was tired and misreading datasheets.  Sorry for the misinformation!)  The LM2596 switches at 150KHz, requiring a 33µH inductor; the LM2576 at 52KHz, needing a 100µH inductor.  Here's a link to the LM2576HV on Mouser: http://www.mouser.com/ProductDetail/Texas-Instruments/LM2576HVT-ADJ-NOPB/?qs=sGAEpiMZZMtitjHzVIkrqaeIqJaO9bXJ79mWvBHwitE%3d

  • 0 in reply to Sid Lori
    Prodigy 180 points
    Well, the grinch stole Christmas...the bottom half of my post disappeared. I do understand your plight with 60v, as it is difficult to find chips above 35v. As per one of your tags on the opening post, do I correctly guess that this is something for a 48vDC system, I.E. 42v empty, 60v peak low temperature "equalize" charge? I ask 'cause I found a way to modify a 99¢ 120vAC LED light bulb to run on 48-60vDC with a single chip. With improved heatsinking, it should also last longer than the rated 2,000 hours...