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LM5066I: Enable and Connector Pin with the LM5066I

Jerry%20Leung
Intellectual 905 points
Part Number: LM5066I

Hi Team,

I am working with a client and they have a couple questions with regards to the LM5066I if you could help provide answers to the following:

1)      When the circuit is running and I need to disable the hot swap circuit by pulling low on the enable pin of LM5066I, I would like to know the delay time between enable pin of LM5066I and the output of hot swap circuit. How long does it take?

2)      The maximum current of my plug-in card is around 50A, and the hot swap controller LM5066I will be protecting the plug-in card as well as the rest of the system. We want to make sure that it will not affect the system (the other board) if the user plugs in or plugs out the card while the circuits are live ( let say the current is ~ 50A while the circuits are live). Do we need to implement the “shorter” pin on the connector of the plug-in card and connect it to enable pin of LM5066I to shut down the LM5066I – hot swap circuit while the connector is mating? We are concern about the high current to possibly create an arc and damage the connector when the user plugs out the card. Therefore we want to shut down the hot swap circuit when the user plugs out the card. Do you have any recommendation about this or any solution?

 

Thanks in advance for the help,

Jerry

  • 0
    TI__Genius 10370 points

    Hi Jerry,

    Look below for my comments and feedback:

    1) Since the EN pin is being pulled low, the 4.2mA gate sourcing current is activated. To calculate the time it takes to shut off, we can use I=C*dV/dt, where I is the constant current source in our IC (4.2mA), C is the capacitance of the cap (usually one FET is about 10nF), and dV is the voltage above Vout (13V typical for our device). Using those value, dt = (C*dV) / I = 10nF * 13V / 4.2mA = 31us. 

    2) Yes, please use the shorter pin connector so that the device is powered off first. If not, arcing will occur.

    I hope this helps :-)

    Best Regards,

    Aramis P. Alvarez