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LM5050-1: Body diode problem in LM5050

Shiv Prakash
Prodigy 130 points
Part Number: LM5050-1
Other Parts Discussed in Thread: LM7480-Q1, LM5069

Hello TI Team,

 In the function block diagram, it seems that Body provides conduction path even Gate pin of MOSFET is OFF, So output is available through body diode even MOSFET is OFF. Please clearify it, How to resolve this problem?

  • 0
    TI__Guru 57737 points

    Hi Shiv,

    LM5050-1 is an ORing controller whose main functionality is to block reverse current. LM5050-1 is not intended to be used in application where forward current (from IN to OUT).

    Can you let us know your requirements, so that I can suggest you a suitable part for your requirement,

    • Vin (max):
    • Load Current (max):
    • Total Cout :
    • Protection features required : Current limit, reverse current blocking, input reverse polarity protection, Over Voltage Protection,  Output short circuit protection, input transient immunity etc ..

    Meanwhile you can have a look at LM7480-Q1 which is an ideal diode controller which can also block forward current and has OV protection.

  • 0 in reply to Praveen GD
    Prodigy 130 points

    Hi Praveen GD,

    Having a great day!

    Thanks for your reply,

    LM7480-Q1 is similar to IC that we need for our application, but will not serve our purpose because its input voltage range is 3-65V but our input range requirement is 80V. So please suggest part according to needed range.

  • 0 in reply to Shiv Prakash
    TI__Guru 57737 points

    Hi Shiv,

    Thanks for your reply!

    I understand that you are looking for an IC similar to LM7480-Q1 but need higher voltage support.

    If you can fill  in the below blanks, it will help me to understand in more detail what are your key requirements and helps me in suggesting you the right part suitable for your application.

    • Vin (max):
    • Load Current (max):
    • Total Cout :
    • Protection features required : Current limit, reverse current blocking, input reverse polarity protection, Over Voltage Protection,  Output short circuit protection, input transient immunity etc ..
  • 0 in reply to Praveen GD
    Prodigy 130 points

    HI Praveen,

    In current situation we need a part which have Oring, Inrush protection and reverse current protection features. Currently, we use the  Combination of Two ICs(LM5050 for Oring & LM5069 for Inrush  protection) that will fulfill our requirement. But we want single chipset that have our required features instead of using two IC chipset. So please suggest IC part according to our requirement.

    • Vin (max): 80V
    • Load Current (max): 10A
    • Total Cout : Not mention in datasheet
    • Protection features required : Atleast Inrush current protection, Reverse current protection features

  • 0 in reply to Shiv Prakash
    TI__Guru 57737 points

    Hi Shiv,

    Unfortunately we do not have a part similar to LM7480-Q1 which can support higher voltage (80V).

    The solution you are using currently LM5050 + LM5069 is the best solution we can offer to achieve Oring, Inrush protection and reverse current protection features at 80V.