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LM5050-1: LM5050-1 48V Anti-interpolation protection

Patrick Chen
Mastermind 8875 points
Part Number: LM5050-1
Other Parts Discussed in Thread: LM5069

Hello,

                If customer will use LM5050-1 against 48V anti-interpolation protection, does our chip could implement this function ? Thank you. 

BR

Patrick

  • 0
    TI__Genius 10370 points

    Hi Patrick,

    You would want to use just one LM5050-1 per power supply (look at the image below). If a 2nd LM5050-1 is added on the same line (in the green box) but connected in reverse, then the device won't turn on the FET because it sees a reverse current. Also, there is some wording in Chinese that I can't understand inside the red and green boxes. I hope this helps :-)

    Best Regards,

    Aramis P. Alvarez

  • 0 in reply to Aramis P. Alvarez
    Mastermind 8875 points

    Hello Aramis 

            

                    Thanks for feedback. So LM5050-1 could implement protecting against negative voltages just use one stage? Below is LM5069 application note on website. What is the difference between these two design with LM5050-1 and LM5069? Thank you. 

    http://www.ti.com/lit/an/snva683/snva683.pdf

    BR

    Patrick

  • 0 in reply to Patrick Chen
    TI__Genius 10370 points

    Hi Patrick,

    You can implement a reverse blocking diode on the LM5050-1. Also, one device per rail will suffice. There's a schematic on the datasheet (Figure 31) showing an application with reverse polarity protection using the LM5050-1.

    The LM5069 is a hot-swap controller, whereas the LM5050-1 is an ORing controller. Here's a quick overview of the differences:

    1) OR-ing

    - Reverse current detection and protection (great for redundant power supplies like the picture you posted up top)

    - VERY Low voltage dropout compared to a diode

    2) Hot-swap

    -Short circuit protection

    -over current protection

    -under voltage protection

    -over voltage protection

    -current limit and power limit features to protect the FET and system downstream

    -analog monitoring of current

    -power good signal that goes high once Vout is almost at the same level as Vin (great for turning on devices downstream once the system is up and running)

    Just remember that the Hot-swap cannot detect reverse current. For a redundant power supply application, a hot-swap won't protect for reverse current. Also, not all the features listed for the hot-swap above are in every hot-swap device. Sometimes our customers use an OR-ing and a hot-swap controller right after the ORing for all of the protection features listed above. You can find a TI design guide using an LM5050 and an LM5069 for one rail here: http://www.ti.com/tool/TIDA-00233

    One last thing, our team created an easy to use selection tool for hot swap controllers. Just go to ti.com/hotswap ==> then click on "Tools & software" on the gray tabs ==> Then click on "Hot Swap selection tool".