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LM5050-1: LM5050-1 gate driving capability

Gene Qiu
Intellectual 1720 points
Part Number: LM5050-1
Other Parts Discussed in Thread: LM5060

Hi Team, 

I have a 1000W  power project using lm5050. Because this IC is used for the first time, please help me to have a look. The schematic diagram is as follows,

There are two power supplys, so 2pcs lm5050 are used like datasheet), one power supply is 27V 1000W, another is 24V lead-acid battery, power 1000W, current more than 40A. Each LM5050 drives 2 pairs back-to-back N-MOS, which means 4 N-MOS q23, q24, q25 and q26 in picture above.  MOSFET is AOTL66608 like below

Could you help me to double check below: ow:

Question 1: Is the LM5050-1 gate driving capability sufficient to dirve 4N-MOS?

Question 2:  When the output voltage is higher than the input voltage, whether the IC can shut down MOS normally with this Back-to-back structure?

Question 3: Is there any difference or preferance for VS  connected to input  or the output?

Thank you very much!

Best Regards

  • 0
    TI__Genius 16305 points

    Hi

    LM5050 can not be used to drive two back-back NMOS due to the gate drive.

    Because, MOSFET is turned off by connecting Gate to IN. For the first MOSFET, this means Gate-Drain is short, so this MOSFET will not be turned off.

    We recommend to use LM5060 along with LM5050 or LM74700.

    Regards,
    Kari.